summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/pc1512.cpp
blob: 1d4d59b693872b2c41f4ec5bf9460cc4e85530e7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
// license:BSD-3-Clause
// copyright-holders:Curt Coder
/*

    Amstrad PC1512

    http://www.seasip.info/AmstradXT
    http://stason.org/TULARC/pc/hard-drives-hdd/tandon/TM262-21MB-5-25-HH-MFM-ST506.html

*/

/*

    TODO:

    - adjust mouse speed
    - pc1512 V3 VDU check fails
    - Amstrad SM2400 internal modem
    - Amstrad RP4 diagnostic ISA card (PC1512)
    - Amstrad RP5-2 diagnostic ISA card (PC1640)
    - 40291/8908 B ROM on PC1640 HD30 controller card

*/

/*
HARD DISC INSTALLATION INSTRUCTIONS

Applies to both ten and twenty megabyte versions.

1. Turn on machine
2. Insert disc 1 (the red disc) and press a key.
3. Type fdisk (RETURN)
4. At each prompt press the RETURN key (another three times).
5. The A> will now appear so now type format c:/s (RETURN).
6. Now push the Y key (RETURN).
7. The hard disc will now begin to format, if you have a 10Mb machine then it will count up to 305
   cylinders. If you have a 20 Mb machine then 610 cylinders will be counted.
8. Once this is done, take out disc 1 and insert disc 5 (the maroon disc).
9. Now type config(RETURN). This procedure will copy all five discs (order 5,1,2,3,4) onto the hard disc.
   Once finished the screen will show some information about the size of the disc and the number of files and
   directories present.
10. To now use the hard disc remove the floppy disc from the drive and store in a safe place with the other
    four discs then restart the computer by pushing Alt Ctrl and Del.
11. After a short while the AMSTRAD PC info will come up and tell you when the machine was last used
    and then after a little longer the screen will clear and will display this message,

F1=DOSPLUS.SYS
F2=DOS.SYS

Select operating system:

If you choose F1 then DOS Plus and GEM will be booted, or if you press F2 then MS-DOS will be booted.

PC1512-HD10: ?
PC1512-HD20: Tandon TM-262 [-chs 615,4,17 -ss 512]
*/

/*
HARD DISC INSTALLATION ON PC1640

PC1640 hard disc comes ready installed with the necessary software. That is discs 1 to 4 that are
supplied ready with the machine.

Howevere in the case of a disc failure it may be necessary to reinstall the supplied software.

This is done in the following way:
1. Put disc one into drive A: and boot up the system
2. Put disc four into drive A: and type CD\SUPPLEME and press return.
3. Type HDFORMAT and press return.
4. Answer YES to the screen prompt.
5. When HDFORMAT is completed remove disc four and replace with disc one.
6. Type CD\ and press return.
7. Type FDISK and press return.
8. Press return key every time you are asked a question.
9. With disc one still in drive A: type FORMAT C:/S and press return.
10. When formatting is finished replace disc one with disc four.
11. Type CD\SUPPLEME and press return.
12. Type CONFIG and press return.

After typing CONFIG the machine will proceed to copy the four system discs to the hard disc.
After copying each disc you will be prompted to insert the next disc.
You do not noeed to know in which order to insert the discs because the machine will tell you which disc is
needed next.

The system is now installed and should be tested by rebooting the machine.

It should be noted that if the hard disc is ok but the software has been corrupted or deleted you can
reinstall the software without reformatting.
This is done by following steps 11 and 12.

PC1640-HD20: Amstrad 40095 (Alps DRMD20A12A), Tandon TM-262 [-chs 615,4,17 -ss 512]
PC1640-HD30: Western Digital 95038 [-chs 615,6,17 -ss 512]
*/

#include "emu.h"
#include "includes/pc1512.h"
#include "bus/rs232/rs232.h"
#include "bus/isa/ega.h"
#include "softlist.h"
#include "speaker.h"


//**************************************************************************
//  SYSTEM STATUS REGISTER
//**************************************************************************

//-------------------------------------------------
//  system_r -
//-------------------------------------------------

READ8_MEMBER( pc1512_base_state::system_r )
{
	uint8_t data = 0;

	switch (offset)
	{
	case 0:
		if (BIT(m_port61, 7))
		{
			/*

			    bit     description

			    0       1
			    1       8087 NDP installed
			    2       1
			    3       1
			    4       DDM0
			    5       DDM1
			    6       second floppy disk drive installed
			    7       0

			*/

			data = m_status1;
		}
		else
		{
			data = m_kbd;
			m_kb_bits = 0;
			m_kb->data_w(1);
			m_pic->ir1_w(CLEAR_LINE);
		}
		break;

	case 1:
		data = m_port61;
		break;

	case 2:
		/*

		    bit     description

		    0       RAM0 / RAM4
		    1       RAM1
		    2       RAM2
		    3       RAM3
		    4       undefined
		    5       8253 PIT OUT2 output
		    6       external parity error (I/OCHCK from expansion bus)
		    7       on-board system RAM parity error

		*/

		if (BIT(m_port61, 2))
			data = m_status2 & 0x0f;
		else
			data = m_status2 >> 4;

		data |= m_pit2 << 5;
		break;
	}

	return data;
}


//-------------------------------------------------
//  system_w -
//-------------------------------------------------

WRITE8_MEMBER( pc1512_base_state::system_w )
{
	switch (offset)
	{
	case 1:
		/*

		    bit     description

		    0       8253 GATE 2 (speaker modulate)
		    1       speaker drive
		    2       enable port C LSB / disable MSB
		    3       undefined
		    4       disable parity checking of on-board RAM
		    5       prevent external parity errors from causing NMI
		    6       enable incoming Keyboard Clock
		    7       enable Status-1/Disable Keyboard Code on Port A

		*/

		m_port61 = data;

		m_pit->write_gate2(BIT(data, 0));

		m_speaker_drive = BIT(data, 1);
		update_speaker();

		m_kb->clock_w(BIT(data, 6));

		if (BIT(data, 7))
		{
			m_kb_bits = 0;
			m_kb->data_w(1);
			m_pic->ir1_w(CLEAR_LINE);
		}
		break;

	case 4:
		/*

		    bit     description

		    0
		    1       PA1 - 8087 NDP installed
		    2
		    3
		    4       PA4 - DDM0
		    5       PA5 - DDM1
		    6       PA6 - Second Floppy disk drive installed
		    7

		*/

		if (BIT(data, 7))
			m_status1 = data ^ 0x8d;
		else
			m_status1 = data;
		break;

	case 5:
		/*

		    bit     description

		    0       PC0 (LSB) - RAM0
		    1       PC1 (LSB) - RAM1
		    2       PC2 (LSB) - RAM2
		    3       PC3 (LSB) - RAM3
		    4       PC0 (MSB) - RAM4
		    5       PC1 (MSB) - Undefined
		    6       PC2 (MSB) - Undefined
		    7       PC3 (MSB) - Undefined

		*/

		m_status2 = data;
		break;

	case 6:
		machine_reset();
		break;
	}
}



//**************************************************************************
//  MOUSE
//**************************************************************************

//-------------------------------------------------
//  mouse_r -
//-------------------------------------------------

READ8_MEMBER( pc1512_base_state::mouse_r )
{
	uint8_t data = 0;

	switch (offset)
	{
	case 0:
		data = m_mouse_x;
		break;

	case 2:
		data = m_mouse_y;
		break;
	}

	return data;
}


//-------------------------------------------------
//  mouse_w -
//-------------------------------------------------

WRITE8_MEMBER( pc1512_base_state::mouse_w )
{
	switch (offset)
	{
	case 0:
		m_mouse_x = 0;
		break;

	case 2:
		m_mouse_y = 0;
		break;
	}
}



//**************************************************************************
//  DIRECT MEMORY ACCESS
//**************************************************************************

//-------------------------------------------------
//  dma_page_w -
//-------------------------------------------------

WRITE8_MEMBER( pc1512_base_state::dma_page_w )
{
	/*

	    bit     description

	    0       Address bit A16
	    1       Address bit A17
	    2       Address bit A18
	    3       Address bit A19
	    4
	    5
	    6
	    7

	*/

	switch (offset)
	{
	case 1:
		m_dma_page[2] = data & 0x0f;
		break;

	case 2:
		m_dma_page[3] = data & 0x0f;
		break;

	case 3:
		m_dma_page[0] = m_dma_page[1] = data & 0x0f;
		break;
	}
}



//**************************************************************************
//  INTERRUPTS
//**************************************************************************

//-------------------------------------------------
//  nmi_mask_w -
//-------------------------------------------------

WRITE8_MEMBER( pc1512_base_state::nmi_mask_w )
{
	m_nmi_enable = BIT(data, 7);
}



//**************************************************************************
//  PRINTER
//**************************************************************************

//-------------------------------------------------
//  printer_r -
//-------------------------------------------------

READ8_MEMBER( pc1512_base_state::printer_r )
{
	uint8_t data = 0;

	switch (offset)
	{
	case 0:
		data = m_printer_data;
		break;

	case 1:
		/*

		    bit     description

		    0       LK1 fitted
		    1       LK2 fitted
		    2       LK3 fitted
		    3       printer error
		    4       printer selected
		    5       paper out
		    6       printer acknowledge
		    7       printer busy

		*/

		data |= m_lk->read() & 0x07;

		data |= m_centronics_fault << 3;
		data |= m_centronics_select << 4;
		data |= m_centronics_perror << 5;
		data |= m_centronics_ack << 6;
		data |= m_centronics_busy << 7;
		break;

	case 2:
		/*

		    bit     description

		    0       Data Strobe
		    1       Select Auto Feed
		    2       Reset Printer
		    3       Select Printer
		    4       Enable Int on ACK
		    5       1
		    6
		    7

		*/

		data = m_printer_control | 0x20;
		break;
	}

	return data;
}


//-------------------------------------------------
//  printer_r -
//-------------------------------------------------

READ8_MEMBER( pc1640_state::printer_r )
{
	uint8_t data = 0;

	switch (offset)
	{
	case 2:
		/*

		    bit     description

		    0       Data Strobe
		    1       Select Auto Feed
		    2       Reset Printer
		    3       Select Printer
		    4       Enable Int on ACK
		    5       OPT
		    6       SW6
		    7       SW7

		*/

		/*
		Bit D5 is the option (OPT) bit and can return one of three different pieces of
		information. Although not documented as such on the PC1512, Bit D5 was always a
		"1", however on the PC1640 it will always be a zero if immediately prior to the
		read of channel 037Ah the software performs an I/O read of an I/O channel
		implemented on the PC1512 main board, having address line A7 high (for example,
		the CGA channels). This is a simple test for software to detect whether it is
		running on a PC1512 or a PC1640. A PC1512 will give a 1, whereas a PC1640 will
		give a 0.

		In addition to being a test of machine type the OPT bit, D5, can also reflect
		the state of either SW9 or SW10. The OPT bit will reflect the state of switch
		SW9 by an I/O read operation to an I/O channel not implemented on the main
		board and having address lines A14 and A7 both low (for example channel 0278h)
		immediately prior to the reading of channel 037Ah. The OPT bit is set to the
		state of switch SW10 by an I/O read operation to an I/O channel not implemented
		on the main board having address lines A14 high and A7 low (for example channel
		4278h). Software testing OPT bit should disable interrupts before the initial
		(dummy) channel read and the I/O read of channel 037A in order to avoid
		additional (interrupt based) I/O operations between the setting and the testing
		of the information read back in the OPT bit. For switches SW9 and SW10, a logic
		"1" is returned when the switch is on the "on" position and a logic "0" if the
		switch is in the "off" position.
		*/
		data = m_printer_control;
		data |= m_opt << 5;
		data |= (m_sw->read() & 0x60) << 1;
		break;

	default:
		data = pc1512_base_state::printer_r(space, offset);
		break;
	}

	return data;
}


//-------------------------------------------------
//  printer_w -
//-------------------------------------------------

WRITE8_MEMBER( pc1512_base_state::printer_w )
{
	switch (offset)
	{
	case 0:
		m_printer_data = data;
		m_cent_data_out->write(space, 0, data);
		break;

	case 2:
		/*

		    bit     description

		    0       Data Strobe
		    1       Select Auto Feed
		    2       Reset Printer
		    3       Select Printer
		    4       Enable Int on ACK
		    5
		    6
		    7

		*/

		m_printer_control = data & 0x1f;

		m_centronics->write_strobe(BIT(data, 0));
		m_centronics->write_autofd(BIT(data, 1));
		m_centronics->write_init(BIT(data, 2));

		m_ack_int_enable = BIT(data, 4);
		update_ack();
		break;
	}
}


//**************************************************************************
//  PC1640 I/O ACCESS
//**************************************************************************

//-------------------------------------------------
//  io_r -
//-------------------------------------------------

READ8_MEMBER( pc1640_state::io_r )
{
	uint8_t data = 0;
	offs_t addr = offset & 0x3ff;
	bool decoded = false;

	if      (                 addr <= 0x00f) { data = m_dmac->read(space, offset & 0x0f); decoded = true; }
	else if (addr >= 0x020 && addr <= 0x021) { data = m_pic->read(space, offset & 0x01); decoded = true; }
	else if (addr >= 0x040 && addr <= 0x043) { data = m_pit->read(space, offset & 0x03); decoded = true; }
	else if (addr >= 0x060 && addr <= 0x06f) { data = system_r(space, offset & 0x0f); decoded = true; }
	else if (addr >= 0x070 && addr <= 0x073) { data = m_rtc->read(space, offset & 0x01); decoded = true; }
	else if (addr >= 0x078 && addr <= 0x07f) { data = mouse_r(space, offset & 0x07); decoded = true; }
	else if (addr >= 0x378 && addr <= 0x37b) { data = printer_r(space, offset & 0x03); decoded = true; }
	else if (addr >= 0x3b0 && addr <= 0x3df) { decoded = true; }
	else if (addr >= 0x3f4 && addr <= 0x3f4) { data = m_fdc->fdc->msr_r(space, offset & 0x01); decoded = true; }
	else if (addr >= 0x3f5 && addr <= 0x3f5) { data = m_fdc->fdc->fifo_r(space, offset & 0x01); decoded = true; }
	else if (addr >= 0x3f8 && addr <= 0x3ff) { data = m_uart->ins8250_r(space, offset & 0x07); decoded = true; }

	if (decoded)
	{
		if (BIT(offset, 7))
		{
			m_opt = 0;
			//logerror("OPT 0\n");
		}
	}
	else if (!BIT(offset, 7))
	{
		uint16_t sw = m_sw->read();

		if (!BIT(offset, 14))
		{
			m_opt = BIT(sw, 8);
			logerror("OPT SW9 %u\n", m_opt);
		}
		else
		{
			m_opt = BIT(sw, 9);
			logerror("OPT SW10 %u\n", m_opt);
		}
	}

	return data;
}



//**************************************************************************
//  ADDRESS MAPS
//**************************************************************************

//-------------------------------------------------
//  ADDRESS_MAP( pc1512_mem )
//-------------------------------------------------

void pc1512_state::pc1512_mem(address_map &map)
{
	map(0x00000, 0x9ffff).ram();
	map(0xb8000, 0xbbfff).rw(this, FUNC(pc1512_state::video_ram_r), FUNC(pc1512_state::video_ram_w));
	map(0xfc000, 0xfffff).rom().region(I8086_TAG, 0);
}


//-------------------------------------------------
//  ADDRESS_MAP( pc1512_io )
//-------------------------------------------------

void pc1512_state::pc1512_io(address_map &map)
{
	// [RH] 29 Aug 2016: I can find no evidence to indicate that Amstrad had only 10 I/O lines, as the
	// schematic calls for a stock 8086 and the I/O and data lines are multiplexed onto the same bus,
	// plus address lines 20-10 are towards the middle of a standard ISA slot. If it turns out that this
	// is not in fact accurate to hardware, please add this back in.
	// ADDRESS_MAP_GLOBAL_MASK(0x3ff)
	map(0x000, 0x00f).rw(m_dmac, FUNC(am9517a_device::read), FUNC(am9517a_device::write));
	map(0x020, 0x021).rw(m_pic, FUNC(pic8259_device::read), FUNC(pic8259_device::write));
	map(0x040, 0x043).rw(m_pit, FUNC(pit8253_device::read), FUNC(pit8253_device::write));
	map(0x060, 0x06f).rw(this, FUNC(pc1512_state::system_r), FUNC(pc1512_state::system_w));
	map(0x070, 0x071).mirror(0x02).rw(m_rtc, FUNC(mc146818_device::read), FUNC(mc146818_device::write));
	map(0x078, 0x07f).rw(this, FUNC(pc1512_state::mouse_r), FUNC(pc1512_state::mouse_w));
	map(0x080, 0x083).w(this, FUNC(pc1512_state::dma_page_w));
	map(0x0a1, 0x0a1).w(this, FUNC(pc1512_state::nmi_mask_w));
	map(0x378, 0x37b).rw(this, FUNC(pc1512_state::printer_r), FUNC(pc1512_state::printer_w));
	map(0x3d0, 0x3df).rw(this, FUNC(pc1512_state::vdu_r), FUNC(pc1512_state::vdu_w));
	map(0x3f0, 0x3f7).m(m_fdc, FUNC(pc_fdc_xt_device::map));
	map(0x3f8, 0x3ff).rw(m_uart, FUNC(ins8250_device::ins8250_r), FUNC(ins8250_device::ins8250_w));
}


//-------------------------------------------------
//  ADDRESS_MAP( pc1640_mem )
//-------------------------------------------------

void pc1640_state::pc1640_mem(address_map &map)
{
	map(0x00000, 0x9ffff).ram();
	map(0xf0000, 0xf3fff).mirror(0xc000).rom().region(I8086_TAG, 0);
}


//-------------------------------------------------
//  ADDRESS_MAP( pc1640_io )
//-------------------------------------------------

void pc1640_state::pc1640_io(address_map &map)
{
	map(0x0000, 0xffff).r(this, FUNC(pc1640_state::io_r));

	map(0x000, 0x00f).w(m_dmac, FUNC(am9517a_device::write));
	map(0x020, 0x021).w(m_pic, FUNC(pic8259_device::write));
	map(0x040, 0x043).w(m_pit, FUNC(pit8253_device::write));
	map(0x060, 0x06f).w(this, FUNC(pc1640_state::system_w));
	map(0x070, 0x071).mirror(0x02).w(m_rtc, FUNC(mc146818_device::write));
	map(0x078, 0x07f).w(this, FUNC(pc1640_state::mouse_w));
	map(0x080, 0x083).w(this, FUNC(pc1640_state::dma_page_w));
	map(0x0a1, 0x0a1).w(this, FUNC(pc1640_state::nmi_mask_w));
	map(0x378, 0x37b).w(this, FUNC(pc1640_state::printer_w));
	map(0x3f2, 0x3f2).w(m_fdc, FUNC(pc_fdc_xt_device::dor_w));
	map(0x3f5, 0x3f5).w(PC_FDC_XT_TAG ":upd765", FUNC(upd765_family_device::fifo_w));
	map(0x3f8, 0x3ff).w(m_uart, FUNC(ins8250_device::ins8250_w));
}



//**************************************************************************
//  INPUT PORTS
//**************************************************************************

//-------------------------------------------------
//  INPUT_PORTS( pc1512 )
//-------------------------------------------------

static INPUT_PORTS_START( pc1512 )
	PORT_START("LK")
	PORT_DIPNAME( 0x07, 0x07, DEF_STR( Language ) )
	PORT_DIPSETTING(    0x07, DEF_STR( English ) )
	PORT_DIPSETTING(    0x06, DEF_STR( German ) )
	PORT_DIPSETTING(    0x05, DEF_STR( French ) )
	PORT_DIPSETTING(    0x04, DEF_STR( Spanish ) )
	PORT_DIPSETTING(    0x03, "Danish" )
	PORT_DIPSETTING(    0x02, "Swedish" )
	PORT_DIPSETTING(    0x01, DEF_STR( Italian ) )
	PORT_DIPSETTING(    0x00, "Diagnostic Mode" )
	PORT_DIPNAME( 0x08, 0x08, "Memory Size")
	PORT_DIPSETTING( 0x08, "512 KB" )
	PORT_DIPSETTING( 0x00, "640 KB" )
	PORT_DIPNAME( 0x10, 0x10, "ROM Size")
	PORT_DIPSETTING( 0x10, "16 KB" )
	PORT_DIPSETTING( 0x00, "32 KB" )
	PORT_DIPNAME( 0x60, 0x60, "Character Set")
	PORT_DIPSETTING( 0x60, "Default (Codepage 437)" )
	PORT_DIPSETTING( 0x40, "Portuguese (Codepage 865)" )
	PORT_DIPSETTING( 0x20, "Norwegian (Codepage 860)" )
	PORT_DIPSETTING( 0x00, "Greek")
	PORT_DIPNAME( 0x80, 0x80, "Floppy Ready Line")
	PORT_DIPSETTING( 0x80, "Connected" )
	PORT_DIPSETTING( 0x00, "Not connected" )
INPUT_PORTS_END


//-------------------------------------------------
//  INPUT_PORTS( pc1640 )
//-------------------------------------------------

static INPUT_PORTS_START( pc1640 )
	PORT_START("LK")
	PORT_DIPNAME( 0x07, 0x07, DEF_STR( Language ) )
	PORT_DIPSETTING(    0x07, DEF_STR( English ) )
	PORT_DIPSETTING(    0x06, DEF_STR( German ) )
	PORT_DIPSETTING(    0x05, DEF_STR( French ) )
	PORT_DIPSETTING(    0x04, DEF_STR( Spanish ) )
	PORT_DIPSETTING(    0x03, "Danish" )
	PORT_DIPSETTING(    0x02, "Swedish" )
	PORT_DIPSETTING(    0x01, DEF_STR( Italian ) )
	PORT_DIPSETTING(    0x00, "Diagnostic Mode" )

	PORT_START("SW")
	PORT_DIPNAME( 0x0f, 0x09, "Initial Display Mode" ) PORT_DIPLOCATION("SW:1,2,3,4") PORT_CONDITION("SW", 0x200, EQUALS, 0x200)
	PORT_DIPSETTING(    0x0b, "Internal MD, External CGA80" )
	PORT_DIPSETTING(    0x0a, "Internal MD, External CGA40" )
	PORT_DIPSETTING(    0x09, "Internal ECD350, External MDA/HERC" )
	PORT_DIPSETTING(    0x08, "Internal ECD200, External MDA/HERC" )
	PORT_DIPSETTING(    0x07, "Internal CD80, External MDA/HERC" )
	PORT_DIPSETTING(    0x06, "Internal CD40, External MDA/HERC" )
	PORT_DIPSETTING(    0x05, "External CGA80, Internal MD" )
	PORT_DIPSETTING(    0x04, "External CGA40, Internal MD" )
	PORT_DIPSETTING(    0x03, "External MDA/HERC, Internal ECD350" )
	PORT_DIPSETTING(    0x02, "External MDA/HERC, Internal ECD200" )
	PORT_DIPSETTING(    0x01, "External MDA/HERC, Internal CD80" )
	PORT_DIPSETTING(    0x00, "External MDA/HERC, Internal CD40" )
	PORT_DIPNAME( 0x10, 0x10, "MC6845 Mode" ) PORT_DIPLOCATION("SW:5") PORT_CONDITION("SW", 0x200, EQUALS, 0x200)
	PORT_DIPSETTING(    0x10, "EGA" )
	PORT_DIPSETTING(    0x00, "CGA/MDA/HERC" )
	PORT_DIPNAME( 0x60, 0x00, "Font" ) PORT_DIPLOCATION("SW:6,7") PORT_CONDITION("SW", 0x300, EQUALS, 0x300)
	PORT_DIPSETTING(    0x00, DEF_STR( English ) )
	PORT_DIPSETTING(    0x60, "Danish" )
	PORT_DIPSETTING(    0x40, "Portuguese" )
	PORT_DIPSETTING(    0x20, "Greek" )
	PORT_DIPNAME( 0x60, 0x60, "Default Display Mode" ) PORT_DIPLOCATION("SW:6,7") PORT_CONDITION("SW", 0x200, EQUALS, 0x000)
	PORT_DIPSETTING(    0x60, "External EGA" )
	PORT_DIPSETTING(    0x40, "External CGA in 40 Column Mode" )
	PORT_DIPSETTING(    0x20, "External CGA in 80 Column Mode" )
	PORT_DIPSETTING(    0x00, "External Monochrome Adapter" )
	PORT_DIPNAME( 0x80, 0x00, "Monitor" ) PORT_DIPLOCATION("SW:8") PORT_CONDITION("SW", 0x200, EQUALS, 0x200)
	PORT_DIPSETTING(    0x80, "CD (Standard RGB)" )
	PORT_DIPSETTING(    0x00, "ECD (Enhanced RGB)" )
	PORT_DIPNAME( 0x100, 0x100, "Foreign Fonts" ) PORT_DIPLOCATION("SW:9") PORT_CONDITION("SW", 0x200, EQUALS, 0x200)
	PORT_DIPSETTING(     0x100, "Enabled" )
	PORT_DIPSETTING(     0x000, "Disabled" )
	PORT_DIPNAME( 0x200, 0x200, "Internal Graphics Adapter" ) PORT_DIPLOCATION("SW:10")
	PORT_DIPSETTING(     0x200, "Enabled" )
	PORT_DIPSETTING(     0x000, "Disabled" )
INPUT_PORTS_END



//**************************************************************************
//  DEVICE CONFIGURATION
//**************************************************************************

//-------------------------------------------------
//  PC1512_KEYBOARD_INTERFACE( kb_intf )
//-------------------------------------------------

WRITE_LINE_MEMBER( pc1512_base_state::kbdata_w )
{
	m_kbdata = state;
}

WRITE_LINE_MEMBER( pc1512_base_state::kbclk_w )
{
	if (!BIT(m_port61, 7) && m_kbclk && !state)
	{
		m_kbd <<= 1;
		m_kbd |= m_kbdata;
		m_kb_bits++;

		if (m_kb_bits == 8)
		{
			m_kb->data_w(0);
			m_pic->ir1_w(ASSERT_LINE);
		}
	}

	m_kbclk = state;
}

WRITE8_MEMBER( pc1512_base_state::mouse_x_w )
{
	if (data > m_mouse_x_old)
		m_mouse_x+=3;
	else
		m_mouse_x-=3;

	m_mouse_x_old = data;
}

WRITE8_MEMBER( pc1512_base_state::mouse_y_w )
{
	if (data > m_mouse_y_old)
		m_mouse_y-=3;
	else
		m_mouse_y+=3;

	m_mouse_y_old = data;
}

//-------------------------------------------------
//  I8237_INTERFACE( dmac_intf )
//-------------------------------------------------

void pc1512_base_state::update_fdc_tc()
{
	if (m_nden)
		m_fdc->tc_w(m_neop);
	else
		m_fdc->tc_w(false);
}

WRITE_LINE_MEMBER( pc1512_base_state::hrq_w )
{
	m_maincpu->set_input_line(INPUT_LINE_HALT, state ? ASSERT_LINE : CLEAR_LINE);

	m_dmac->hack_w(state);
}

WRITE_LINE_MEMBER( pc1512_base_state::eop_w )
{
	if (m_dma_channel == 2)
	{
		m_neop = !state;
		update_fdc_tc();
	}
}

READ8_MEMBER( pc1512_base_state::memr_r )
{
	address_space &program = m_maincpu->space(AS_PROGRAM);
	offs_t page_offset = m_dma_page[m_dma_channel] << 16;

	return program.read_byte(page_offset + offset);
}

WRITE8_MEMBER( pc1512_base_state::memw_w )
{
	address_space &program = m_maincpu->space(AS_PROGRAM);
	offs_t page_offset = m_dma_page[m_dma_channel] << 16;

	program.write_byte(page_offset + offset, data);
}

READ8_MEMBER( pc1512_base_state::ior1_r )
{
	return m_bus->dack_r(1);
}

READ8_MEMBER( pc1512_base_state::ior2_r )
{
	if (m_nden)
		return m_fdc->dma_r();
	else
		return m_bus->dack_r(2);
}

READ8_MEMBER( pc1512_base_state::ior3_r )
{
	return m_bus->dack_r(3);
}

WRITE8_MEMBER( pc1512_base_state::iow0_w )
{
	m_dreq0 = 0;
	m_dmac->dreq0_w(m_dreq0);
}

WRITE8_MEMBER( pc1512_base_state::iow1_w )
{
	m_bus->dack_w(1, data);
}

WRITE8_MEMBER( pc1512_base_state::iow2_w )
{
	if (m_nden)
		m_fdc->dma_w(data);
	else
		m_bus->dack_w(2, data);
}

WRITE8_MEMBER( pc1512_base_state::iow3_w )
{
	m_bus->dack_w(3, data);
}

WRITE_LINE_MEMBER( pc1512_base_state::dack0_w )
{
	if (!state) m_dma_channel = 0;
}

WRITE_LINE_MEMBER( pc1512_base_state::dack1_w )
{
	if (!state) m_dma_channel = 1;
}

WRITE_LINE_MEMBER( pc1512_base_state::dack2_w )
{
	if (!state) m_dma_channel = 2;
}

WRITE_LINE_MEMBER( pc1512_base_state::dack3_w )
{
	if (!state) m_dma_channel = 3;
}

//-------------------------------------------------
//  pit8253_config pit_intf
//-------------------------------------------------

void pc1512_base_state::update_speaker()
{
	m_speaker->level_w(m_speaker_drive & m_pit2);
}

WRITE_LINE_MEMBER( pc1512_base_state::pit1_w )
{
	if (!m_pit1 && state && !m_dreq0)
	{
		m_dreq0 = 1;
		m_dmac->dreq0_w(m_dreq0);
	}

	m_pit1 = state;
}

WRITE_LINE_MEMBER( pc1512_base_state::pit2_w )
{
	m_pit2 = state;
	update_speaker();
}

//-------------------------------------------------
//  upd765_interface fdc_intf
//-------------------------------------------------

void pc1512_base_state::update_fdc_int()
{
	if (m_nden)
		m_pic->ir6_w(m_dint);
	else
		m_pic->ir6_w(CLEAR_LINE);
}

void pc1512_base_state::update_fdc_drq()
{
	if (m_nden)
		m_dmac->dreq2_w(m_ddrq);
	else
		m_dmac->dreq2_w(0);
}

WRITE_LINE_MEMBER( pc1512_base_state::fdc_int_w )
{
	m_dint = state;
	update_fdc_int();
}

WRITE_LINE_MEMBER( pc1512_base_state::fdc_drq_w )
{
	m_ddrq = state;
	update_fdc_drq();
}

//-------------------------------------------------
//  centronics_interface centronics_intf
//-------------------------------------------------

void pc1512_base_state::update_ack()
{
	if (m_ack_int_enable)
		m_pic->ir7_w(m_centronics_ack);
	else
		m_pic->ir7_w(CLEAR_LINE);
}

WRITE_LINE_MEMBER( pc1512_base_state::write_centronics_ack )
{
	m_centronics_ack = state;
	update_ack();
}

WRITE_LINE_MEMBER( pc1512_base_state::write_centronics_busy )
{
	m_centronics_busy = state;
}

WRITE_LINE_MEMBER( pc1512_base_state::write_centronics_perror )
{
	m_centronics_perror = state;
}

WRITE_LINE_MEMBER( pc1512_base_state::write_centronics_select )
{
	m_centronics_select = state;
}

WRITE_LINE_MEMBER( pc1512_base_state::write_centronics_fault )
{
	m_centronics_fault = state;
}


//-------------------------------------------------
//  isa8bus_interface isabus_intf
//-------------------------------------------------

void pc1640_isa8_cards(device_slot_interface &device)
{
	device.option_add_internal("iga", ISA8_PC1640_IGA);
}

FLOPPY_FORMATS_MEMBER( pc1512_base_state::floppy_formats )
	FLOPPY_PC_FORMAT
FLOPPY_FORMATS_END

static void pc1512_floppies(device_slot_interface &device)
{
	device.option_add("525dd", FLOPPY_525_DD); // Tandon TM65-2L
}



//**************************************************************************
//  MACHINE INITIALIZATION
//**************************************************************************

void pc1512_base_state::machine_start()
{
	save_item(NAME(m_pit1));
	save_item(NAME(m_pit2));
	save_item(NAME(m_status1));
	save_item(NAME(m_status2));
	save_item(NAME(m_port61));
	save_item(NAME(m_nmi_enable));
	save_item(NAME(m_kbd));
	save_item(NAME(m_kb_bits));
	save_item(NAME(m_kbclk));
	save_item(NAME(m_kbdata));
	save_item(NAME(m_mouse_x));
	save_item(NAME(m_mouse_y));
	save_item(NAME(m_mouse_x_old));
	save_item(NAME(m_mouse_y_old));
	save_item(NAME(m_dma_page));
	save_item(NAME(m_dma_channel));
	save_item(NAME(m_dreq0));
	save_item(NAME(m_nden));
	save_item(NAME(m_dint));
	save_item(NAME(m_ddrq));
	save_item(NAME(m_neop));
	save_item(NAME(m_ack_int_enable));
	save_item(NAME(m_centronics_ack));
	save_item(NAME(m_centronics_busy));
	save_item(NAME(m_centronics_perror));
	save_item(NAME(m_centronics_select));
	save_item(NAME(m_centronics_fault));
	save_item(NAME(m_printer_data));
	save_item(NAME(m_printer_control));
	save_item(NAME(m_speaker_drive));
}

void pc1512_state::machine_start()
{
	pc1512_base_state::machine_start();

	// set RAM size
	size_t ram_size = m_ram->size();

	if (ram_size < 640 * 1024)
	{
		address_space &program = m_maincpu->space(AS_PROGRAM);
		program.unmap_readwrite(ram_size, 0x9ffff);
	}

	// state saving
	save_item(NAME(m_toggle));
	save_item(NAME(m_lpen));
	save_item(NAME(m_blink));
	save_item(NAME(m_cursor));
	save_item(NAME(m_blink_ctr));
	save_item(NAME(m_vdu_mode));
	save_item(NAME(m_vdu_color));
	save_item(NAME(m_vdu_plane));
	save_item(NAME(m_vdu_rdsel));
	save_item(NAME(m_vdu_border));
}

void pc1512_base_state::machine_reset()
{
	m_nmi_enable = 0;

	m_kb_bits = 0;
	m_kb->data_w(1);
	m_pic->ir1_w(CLEAR_LINE);
}

void pc1512_state::machine_reset()
{
	pc1512_base_state::machine_reset();

	m_toggle = 0;
	m_pit2 = 1;

	m_lpen = 0;
	m_blink = 0;
	m_cursor = 0;
	m_blink_ctr = 0;
	m_vdu_mode = 0;
	m_vdu_color = 0;
	m_vdu_rdsel = 0;
	m_vdu_plane = 0x0f;
	m_vdu_border = 0;
}


//-------------------------------------------------
//  MACHINE_START( pc1640 )
//-------------------------------------------------

void pc1640_state::machine_start()
{
	pc1512_base_state::machine_start();

	// state saving
	save_item(NAME(m_opt));
}


//**************************************************************************
//  MACHINE DRIVERS
//**************************************************************************

//-------------------------------------------------
//  MACHINE_CONFIG( pc1512 )
//-------------------------------------------------

MACHINE_CONFIG_START(pc1512_state::pc1512)
	MCFG_CPU_ADD(I8086_TAG, I8086, XTAL(24'000'000)/3)
	MCFG_CPU_PROGRAM_MAP(pc1512_mem)
	MCFG_CPU_IO_MAP(pc1512_io)
	MCFG_CPU_IRQ_ACKNOWLEDGE_DEVICE(I8259A2_TAG, pic8259_device, inta_cb)

	// video
	pc1512_video(config);

	// sound
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.80)

	// devices
	MCFG_DEVICE_ADD(PC1512_KEYBOARD_TAG, PC1512_KEYBOARD, 0)
	MCFG_PC1512_KEYBOARD_CLOCK_CALLBACK(WRITELINE(pc1512_state, kbclk_w))
	MCFG_PC1512_KEYBOARD_DATA_CALLBACK(WRITELINE(pc1512_state, kbdata_w))

	MCFG_PC1512_MOUSE_PORT_ADD(PC1512_MOUSE_PORT_TAG, pc1512_mouse_port_devices, "mouse")
	MCFG_PC1512_MOUSE_PORT_X_CB(WRITE8(pc1512_state, mouse_x_w))
	MCFG_PC1512_MOUSE_PORT_Y_CB(WRITE8(pc1512_state, mouse_y_w))
	MCFG_PC1512_MOUSE_PORT_M1_CB(DEVWRITELINE(PC1512_KEYBOARD_TAG, pc1512_keyboard_device, m1_w))
	MCFG_PC1512_MOUSE_PORT_M2_CB(DEVWRITELINE(PC1512_KEYBOARD_TAG, pc1512_keyboard_device, m2_w))

	MCFG_DEVICE_ADD(I8237A5_TAG, AM9517A, XTAL(24'000'000)/6)
	MCFG_I8237_OUT_HREQ_CB(WRITELINE(pc1512_state, hrq_w))
	MCFG_I8237_OUT_EOP_CB(WRITELINE(pc1512_state, eop_w))
	MCFG_I8237_IN_MEMR_CB(READ8(pc1512_state, memr_r))
	MCFG_I8237_OUT_MEMW_CB(WRITE8(pc1512_state, memw_w))
	MCFG_I8237_IN_IOR_1_CB(READ8(pc1512_state, ior1_r))
	MCFG_I8237_IN_IOR_2_CB(READ8(pc1512_state, ior2_r))
	MCFG_I8237_IN_IOR_3_CB(READ8(pc1512_state, ior3_r))
	MCFG_I8237_OUT_IOW_0_CB(WRITE8(pc1512_state, iow0_w))
	MCFG_I8237_OUT_IOW_1_CB(WRITE8(pc1512_state, iow1_w))
	MCFG_I8237_OUT_IOW_2_CB(WRITE8(pc1512_state, iow2_w))
	MCFG_I8237_OUT_IOW_3_CB(WRITE8(pc1512_state, iow3_w))
	MCFG_I8237_OUT_DACK_0_CB(WRITELINE(pc1512_state, dack0_w))
	MCFG_I8237_OUT_DACK_1_CB(WRITELINE(pc1512_state, dack1_w))
	MCFG_I8237_OUT_DACK_2_CB(WRITELINE(pc1512_state, dack2_w))
	MCFG_I8237_OUT_DACK_3_CB(WRITELINE(pc1512_state, dack3_w))

	MCFG_DEVICE_ADD(I8259A2_TAG, PIC8259, 0)
	MCFG_PIC8259_OUT_INT_CB(INPUTLINE(I8086_TAG, INPUT_LINE_IRQ0))

	MCFG_DEVICE_ADD(I8253_TAG, PIT8253, 0)
	MCFG_PIT8253_CLK0(XTAL(28'636'363)/24)
	MCFG_PIT8253_OUT0_HANDLER(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir0_w))
	MCFG_PIT8253_CLK1(XTAL(28'636'363)/24)
	MCFG_PIT8253_OUT1_HANDLER(WRITELINE(pc1512_state, pit1_w))
	MCFG_PIT8253_CLK2(XTAL(28'636'363)/24)
	MCFG_PIT8253_OUT2_HANDLER(WRITELINE(pc1512_state, pit2_w))

	MCFG_MC146818_ADD(MC146818_TAG, XTAL(32'768))
	MCFG_MC146818_IRQ_HANDLER(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir2_w))

	MCFG_PC_FDC_XT_ADD(PC_FDC_XT_TAG)
	MCFG_PC_FDC_INTRQ_CALLBACK(WRITELINE(pc1512_state, fdc_int_w))
	MCFG_PC_FDC_DRQ_CALLBACK(WRITELINE(pc1512_state, fdc_drq_w))
	MCFG_FLOPPY_DRIVE_ADD(PC_FDC_XT_TAG ":0", pc1512_floppies, "525dd", pc1512_base_state::floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD(PC_FDC_XT_TAG ":1", pc1512_floppies, nullptr,    pc1512_base_state::floppy_formats)

	MCFG_DEVICE_ADD(INS8250_TAG, INS8250, XTAL(1'843'200))
	MCFG_INS8250_OUT_TX_CB(DEVWRITELINE(RS232_TAG, rs232_port_device, write_txd))
	MCFG_INS8250_OUT_DTR_CB(DEVWRITELINE(RS232_TAG, rs232_port_device, write_dtr))
	MCFG_INS8250_OUT_RTS_CB(DEVWRITELINE(RS232_TAG, rs232_port_device, write_rts))
	MCFG_INS8250_OUT_INT_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir4_w))

	MCFG_CENTRONICS_ADD("centronics", centronics_devices, "printer")
	MCFG_CENTRONICS_ACK_HANDLER(WRITELINE(pc1512_state, write_centronics_ack))
	MCFG_CENTRONICS_BUSY_HANDLER(WRITELINE(pc1512_state, write_centronics_busy))
	MCFG_CENTRONICS_PERROR_HANDLER(WRITELINE(pc1512_state, write_centronics_perror))
	MCFG_CENTRONICS_SELECT_HANDLER(WRITELINE(pc1512_state, write_centronics_select))
	MCFG_CENTRONICS_FAULT_HANDLER(WRITELINE(pc1512_state, write_centronics_fault))
	MCFG_CENTRONICS_OUTPUT_LATCH_ADD("cent_data_out", CENTRONICS_TAG)

	MCFG_RS232_PORT_ADD(RS232_TAG, default_rs232_devices, nullptr)
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE(INS8250_TAG, ins8250_uart_device, rx_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE(INS8250_TAG, ins8250_uart_device, dcd_w))
	MCFG_RS232_DSR_HANDLER(DEVWRITELINE(INS8250_TAG, ins8250_uart_device, dsr_w))
	MCFG_RS232_RI_HANDLER(DEVWRITELINE(INS8250_TAG, ins8250_uart_device, ri_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE(INS8250_TAG, ins8250_uart_device, cts_w))

	// ISA8 bus
	MCFG_DEVICE_ADD(ISA_BUS_TAG, ISA8, 0)
	MCFG_ISA8_CPU(I8086_TAG)
	MCFG_ISA_OUT_IRQ2_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir2_w))
	MCFG_ISA_OUT_IRQ3_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir3_w))
	MCFG_ISA_OUT_IRQ4_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir4_w))
	MCFG_ISA_OUT_IRQ5_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir5_w))
	MCFG_ISA_OUT_IRQ6_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir6_w))
	MCFG_ISA_OUT_IRQ7_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir7_w))
	MCFG_ISA_OUT_DRQ1_CB(DEVWRITELINE(I8237A5_TAG, am9517a_device, dreq1_w))
	MCFG_ISA_OUT_DRQ2_CB(DEVWRITELINE(I8237A5_TAG, am9517a_device, dreq2_w))
	MCFG_ISA_OUT_DRQ3_CB(DEVWRITELINE(I8237A5_TAG, am9517a_device, dreq3_w))
	MCFG_ISA8_SLOT_ADD(ISA_BUS_TAG, "isa1", pc_isa8_cards, nullptr, false)
	MCFG_ISA8_SLOT_ADD(ISA_BUS_TAG, "isa2", pc_isa8_cards, nullptr, false)
	MCFG_ISA8_SLOT_ADD(ISA_BUS_TAG, "isa3", pc_isa8_cards, nullptr, false)

	// internal ram
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("512K")
	MCFG_RAM_EXTRA_OPTIONS("544K,576K,608K,640K")

	// software list
	MCFG_SOFTWARE_LIST_ADD("flop_list", "pc1512_flop")
	MCFG_SOFTWARE_LIST_ADD("hdd_list", "pc1512_hdd")
MACHINE_CONFIG_END


//-------------------------------------------------
//  MACHINE_CONFIG( pc1512dd )
//-------------------------------------------------

MACHINE_CONFIG_START(pc1512_state::pc1512dd)
	pc1512(config);
	MCFG_DEVICE_MODIFY(PC_FDC_XT_TAG ":1")
	MCFG_SLOT_DEFAULT_OPTION("525dd")
MACHINE_CONFIG_END


//-------------------------------------------------
//  MACHINE_CONFIG( pc1512hd )
//-------------------------------------------------

MACHINE_CONFIG_START(pc1512_state::pc1512hd)
	pc1512(config);
	MCFG_DEVICE_MODIFY("isa1")
	//MCFG_SLOT_DEFAULT_OPTION("wdxt_gen")
	MCFG_SLOT_DEFAULT_OPTION("hdc")
MACHINE_CONFIG_END


//-------------------------------------------------
//  MACHINE_CONFIG( pc1640 )
//-------------------------------------------------

MACHINE_CONFIG_START(pc1640_state::pc1640)
	MCFG_CPU_ADD(I8086_TAG, I8086, XTAL(24'000'000)/3)
	MCFG_CPU_PROGRAM_MAP(pc1640_mem)
	MCFG_CPU_IO_MAP(pc1640_io)
	MCFG_CPU_IRQ_ACKNOWLEDGE_DEVICE(I8259A2_TAG, pic8259_device, inta_cb)

	// sound
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.80)

	// devices
	MCFG_DEVICE_ADD(PC1512_KEYBOARD_TAG, PC1512_KEYBOARD, 0)
	MCFG_PC1512_KEYBOARD_CLOCK_CALLBACK(WRITELINE(pc1512_base_state, kbclk_w))
	MCFG_PC1512_KEYBOARD_DATA_CALLBACK(WRITELINE(pc1512_base_state, kbdata_w))

	MCFG_PC1512_MOUSE_PORT_ADD(PC1512_MOUSE_PORT_TAG, pc1512_mouse_port_devices, "mouse")
	MCFG_PC1512_MOUSE_PORT_X_CB(WRITE8(pc1512_base_state, mouse_x_w))
	MCFG_PC1512_MOUSE_PORT_Y_CB(WRITE8(pc1512_base_state, mouse_y_w))
	MCFG_PC1512_MOUSE_PORT_M1_CB(DEVWRITELINE(PC1512_KEYBOARD_TAG, pc1512_keyboard_device, m1_w))
	MCFG_PC1512_MOUSE_PORT_M2_CB(DEVWRITELINE(PC1512_KEYBOARD_TAG, pc1512_keyboard_device, m2_w))

	MCFG_DEVICE_ADD(I8237A5_TAG, AM9517A, XTAL(24'000'000)/6)
	MCFG_I8237_OUT_HREQ_CB(WRITELINE(pc1512_base_state, hrq_w))
	MCFG_I8237_OUT_EOP_CB(WRITELINE(pc1512_base_state, eop_w))
	MCFG_I8237_IN_MEMR_CB(READ8(pc1512_base_state, memr_r))
	MCFG_I8237_OUT_MEMW_CB(WRITE8(pc1512_base_state, memw_w))
	MCFG_I8237_IN_IOR_1_CB(READ8(pc1512_base_state, ior1_r))
	MCFG_I8237_IN_IOR_2_CB(READ8(pc1512_base_state, ior2_r))
	MCFG_I8237_IN_IOR_3_CB(READ8(pc1512_base_state, ior3_r))
	MCFG_I8237_OUT_IOW_0_CB(WRITE8(pc1512_base_state, iow0_w))
	MCFG_I8237_OUT_IOW_1_CB(WRITE8(pc1512_base_state, iow1_w))
	MCFG_I8237_OUT_IOW_2_CB(WRITE8(pc1512_base_state, iow2_w))
	MCFG_I8237_OUT_IOW_3_CB(WRITE8(pc1512_base_state, iow3_w))
	MCFG_I8237_OUT_DACK_0_CB(WRITELINE(pc1512_base_state, dack0_w))
	MCFG_I8237_OUT_DACK_1_CB(WRITELINE(pc1512_base_state, dack1_w))
	MCFG_I8237_OUT_DACK_2_CB(WRITELINE(pc1512_base_state, dack2_w))
	MCFG_I8237_OUT_DACK_3_CB(WRITELINE(pc1512_base_state, dack3_w))

	MCFG_DEVICE_ADD(I8259A2_TAG, PIC8259, 0)
	MCFG_PIC8259_OUT_INT_CB(INPUTLINE(I8086_TAG, INPUT_LINE_IRQ0))

	MCFG_DEVICE_ADD(I8253_TAG, PIT8253, 0)
	MCFG_PIT8253_CLK0(XTAL(28'636'363)/24)
	MCFG_PIT8253_OUT0_HANDLER(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir0_w))
	MCFG_PIT8253_CLK1(XTAL(28'636'363)/24)
	MCFG_PIT8253_OUT1_HANDLER(WRITELINE(pc1512_base_state, pit1_w))
	MCFG_PIT8253_CLK2(XTAL(28'636'363)/24)
	MCFG_PIT8253_OUT2_HANDLER(WRITELINE(pc1512_base_state, pit2_w))

	MCFG_MC146818_ADD(MC146818_TAG, XTAL(32'768))
	MCFG_MC146818_IRQ_HANDLER(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir2_w))

	MCFG_PC_FDC_XT_ADD(PC_FDC_XT_TAG)
	MCFG_PC_FDC_INTRQ_CALLBACK(WRITELINE(pc1512_base_state, fdc_int_w))
	MCFG_PC_FDC_DRQ_CALLBACK(WRITELINE(pc1512_base_state, fdc_drq_w))
	MCFG_FLOPPY_DRIVE_ADD(PC_FDC_XT_TAG ":0", pc1512_floppies, "525dd", pc1512_base_state::floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD(PC_FDC_XT_TAG ":1", pc1512_floppies, nullptr,    pc1512_base_state::floppy_formats)

	MCFG_DEVICE_ADD(INS8250_TAG, INS8250, XTAL(1'843'200))
	MCFG_INS8250_OUT_TX_CB(DEVWRITELINE(RS232_TAG, rs232_port_device, write_txd))
	MCFG_INS8250_OUT_DTR_CB(DEVWRITELINE(RS232_TAG, rs232_port_device, write_dtr))
	MCFG_INS8250_OUT_RTS_CB(DEVWRITELINE(RS232_TAG, rs232_port_device, write_rts))
	MCFG_INS8250_OUT_INT_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir4_w))

	MCFG_CENTRONICS_ADD("centronics", centronics_devices, "printer")
	MCFG_CENTRONICS_ACK_HANDLER(WRITELINE(pc1512_base_state, write_centronics_ack))
	MCFG_CENTRONICS_BUSY_HANDLER(WRITELINE(pc1512_base_state, write_centronics_busy))
	MCFG_CENTRONICS_PERROR_HANDLER(WRITELINE(pc1512_base_state, write_centronics_perror))
	MCFG_CENTRONICS_SELECT_HANDLER(WRITELINE(pc1512_base_state, write_centronics_select))
	MCFG_CENTRONICS_FAULT_HANDLER(WRITELINE(pc1512_base_state, write_centronics_fault))
	MCFG_CENTRONICS_OUTPUT_LATCH_ADD("cent_data_out", CENTRONICS_TAG)

	MCFG_RS232_PORT_ADD(RS232_TAG, default_rs232_devices, nullptr)
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE(INS8250_TAG, ins8250_uart_device, rx_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE(INS8250_TAG, ins8250_uart_device, dcd_w))
	MCFG_RS232_DSR_HANDLER(DEVWRITELINE(INS8250_TAG, ins8250_uart_device, dsr_w))
	MCFG_RS232_RI_HANDLER(DEVWRITELINE(INS8250_TAG, ins8250_uart_device, ri_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE(INS8250_TAG, ins8250_uart_device, cts_w))

	// ISA8 bus
	MCFG_DEVICE_ADD(ISA_BUS_TAG, ISA8, 0)
	MCFG_ISA8_CPU(I8086_TAG)
	MCFG_ISA_OUT_IRQ2_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir2_w))
	MCFG_ISA_OUT_IRQ3_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir3_w))
	MCFG_ISA_OUT_IRQ4_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir4_w))
	MCFG_ISA_OUT_IRQ5_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir5_w))
	MCFG_ISA_OUT_IRQ6_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir6_w))
	MCFG_ISA_OUT_IRQ7_CB(DEVWRITELINE(I8259A2_TAG, pic8259_device, ir7_w))
	MCFG_ISA_OUT_DRQ1_CB(DEVWRITELINE(I8237A5_TAG, am9517a_device, dreq1_w))
	MCFG_ISA_OUT_DRQ2_CB(DEVWRITELINE(I8237A5_TAG, am9517a_device, dreq2_w))
	MCFG_ISA_OUT_DRQ3_CB(DEVWRITELINE(I8237A5_TAG, am9517a_device, dreq3_w))
	MCFG_ISA8_SLOT_ADD(ISA_BUS_TAG, "isa1", pc_isa8_cards, nullptr, false)
	MCFG_ISA8_SLOT_ADD(ISA_BUS_TAG, "isa2", pc_isa8_cards, nullptr, false)
	MCFG_ISA8_SLOT_ADD(ISA_BUS_TAG, "isa3", pc_isa8_cards, nullptr, false)
	MCFG_ISA8_SLOT_ADD(ISA_BUS_TAG, "isa4", pc_isa8_cards, nullptr, false)
	MCFG_ISA8_SLOT_ADD(ISA_BUS_TAG, "isa5", pc1640_isa8_cards, "iga", false)

	// internal ram
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("640K")

	// software list
	MCFG_SOFTWARE_LIST_ADD("flop_list", "pc1640_flop")
	MCFG_SOFTWARE_LIST_ADD("hdd_list", "pc1640_hdd")
MACHINE_CONFIG_END


//-------------------------------------------------
//  MACHINE_CONFIG( pc1640dd )
//-------------------------------------------------

MACHINE_CONFIG_START(pc1640_state::pc1640dd)
	pc1640(config);
	MCFG_DEVICE_MODIFY(PC_FDC_XT_TAG ":1")
	MCFG_SLOT_DEFAULT_OPTION("525dd")
MACHINE_CONFIG_END


//-------------------------------------------------
//  MACHINE_CONFIG( pc1640hd )
//-------------------------------------------------

MACHINE_CONFIG_START(pc1640_state::pc1640hd)
	pc1640(config);
	MCFG_DEVICE_MODIFY("isa1")
	//MCFG_SLOT_DEFAULT_OPTION("wdxt_gen")
	MCFG_SLOT_DEFAULT_OPTION("hdc")
MACHINE_CONFIG_END



//**************************************************************************
//  ROMS
//**************************************************************************

//-------------------------------------------------
//  ROM( pc1512 )
//-------------------------------------------------

ROM_START( pc1512 )
	ROM_REGION16_LE( 0x4000, I8086_TAG, 0)
	ROM_SYSTEM_BIOS( 0, "v1", "Version 1" )
	ROMX_LOAD( "40044.ic132", 0x0000, 0x2000, CRC(f72f1582) SHA1(7781d4717917262805d514b331ba113b1e05a247), ROM_SKIP(1) | ROM_BIOS(1) )
	ROMX_LOAD( "40043.ic129", 0x0001, 0x2000, CRC(668fcc94) SHA1(74002f5cc542df442eec9e2e7a18db3598d8c482), ROM_SKIP(1) | ROM_BIOS(1) )
	ROM_SYSTEM_BIOS( 1, "v2", "Version 2" )
	ROMX_LOAD( "40044v2.ic132", 0x0000, 0x2000, CRC(1aec54fa) SHA1(b12fd73cfc35a240ed6da4dcc4b6c9910be611e0), ROM_SKIP(1) | ROM_BIOS(2) )
	ROMX_LOAD( "40043v2.ic129", 0x0001, 0x2000, CRC(d2d4d2de) SHA1(c376fd1ad23025081ae16c7949e88eea7f56e1bb), ROM_SKIP(1) | ROM_BIOS(2) )
	ROM_SYSTEM_BIOS( 2, "v3", "Version 3" )
	ROMX_LOAD( "40044-2.ic132", 0x0000, 0x2000, CRC(ea527e6e) SHA1(b77fa44767a71a0b321a88bb0a394f1125b7c220), ROM_SKIP(1) | ROM_BIOS(3) )
	ROMX_LOAD( "40043-2.ic129", 0x0001, 0x2000, CRC(532c3854) SHA1(18a17b710f9eb079d9d7216d07807030f904ceda), ROM_SKIP(1) | ROM_BIOS(3) )

	ROM_REGION( 0x2000, AMS40041_TAG, 0 )
	ROMX_LOAD( "40045.ic127", 0x0000, 0x2000, CRC(dd5e030f) SHA1(7d858bbb2e8d6143aa67ab712edf5f753c2788a7), ROM_BIOS(1) )
	ROMX_LOAD( "40078.ic127", 0x0000, 0x2000, CRC(ae9c0d04) SHA1(bc8dc4dcedeea5bc1c04986b1f105ad93cb2ebcd), ROM_BIOS(2) )
	ROMX_LOAD( "40078.ic127", 0x0000, 0x2000, CRC(ae9c0d04) SHA1(bc8dc4dcedeea5bc1c04986b1f105ad93cb2ebcd), ROM_BIOS(3) )
ROM_END

#define rom_pc1512dd    rom_pc1512
#define rom_pc1512hd10  rom_pc1512
#define rom_pc1512hd20  rom_pc1512


//-------------------------------------------------
//  ROM( pc1640 )
//-------------------------------------------------

ROM_START( pc1640 )
	ROM_REGION16_LE( 0x4000, I8086_TAG, 0)
	ROM_SYSTEM_BIOS( 0, "8809", "Week 9/1988" )
	ROMX_LOAD( "40044-1 8809.ic132", 0x0000, 0x2000, CRC(f1c074f3) SHA1(a055ea7e933d137623c22fe24004e870653c7952), ROM_SKIP(1) | ROM_BIOS(1) ) // 8809 B
	ROMX_LOAD( "40043-1 8809.ic129", 0x0001, 0x2000, CRC(e40a1513) SHA1(447eff2057e682e51b1c7593cb6fad0e53879fa8), ROM_SKIP(1) | ROM_BIOS(1) ) // 8809 B
	ROM_SYSTEM_BIOS( 1, "8738", "Week 38/1987" )
	ROMX_LOAD( "40044 8738.ic132", 0x0000, 0x2000, CRC(43832ea7) SHA1(eea4a8836f966940a88c88de6c5cc14852545f7d), ROM_SKIP(1) | ROM_BIOS(2) ) // 8738 D F
	ROMX_LOAD( "40043 8738.ic129", 0x0001, 0x2000, CRC(768498f9) SHA1(ac48cb892417d7998d604f3b79756140c554f476), ROM_SKIP(1) | ROM_BIOS(2) ) // 8738 D F
	ROM_SYSTEM_BIOS( 2, "88xx", "Week ?/1988" )
	ROMX_LOAD( "40044 88xx.ic132", 0x0000, 0x2000, CRC(6090f782) SHA1(e21ae524d5b4d00696d293dbd4fe4d7bca22e277), ROM_SKIP(1) | ROM_BIOS(3) )
	ROMX_LOAD( "40043 88xx.ic129", 0x0001, 0x2000, CRC(9219d0aa) SHA1(dde1a46c8f83e413d7070f1356fc91b9f595a8b6), ROM_SKIP(1) | ROM_BIOS(3) )
ROM_END

#define rom_pc1640dd    rom_pc1640
#define rom_pc1640hd20  rom_pc1640
#define rom_pc1640hd30  rom_pc1640



//**************************************************************************
//  SYSTEM DRIVERS
//**************************************************************************

//    YEAR  NAME        PARENT      COMPAT  MACHINE     INPUT   STATE          INIT    COMPANY         FULLNAME        FLAGS
COMP( 1986, pc1512,     0,          0,      pc1512,     pc1512, pc1512_state,  0,      "Amstrad plc",  "PC1512 SD",    MACHINE_SUPPORTS_SAVE )
COMP( 1986, pc1512dd,   pc1512,     0,      pc1512dd,   pc1512, pc1512_state,  0,      "Amstrad plc",  "PC1512 DD",    MACHINE_SUPPORTS_SAVE )
COMP( 1986, pc1512hd10, pc1512,     0,      pc1512hd,   pc1512, pc1512_state,  0,      "Amstrad plc",  "PC1512 HD10",  MACHINE_SUPPORTS_SAVE )
COMP( 1986, pc1512hd20, pc1512,     0,      pc1512hd,   pc1512, pc1512_state,  0,      "Amstrad plc",  "PC1512 HD20",  MACHINE_SUPPORTS_SAVE )
COMP( 1987, pc1640,     0,          0,      pc1640,     pc1640, pc1640_state,  0,      "Amstrad plc",  "PC1640 SD",    MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
COMP( 1987, pc1640dd,   pc1640,     0,      pc1640dd,   pc1640, pc1640_state,  0,      "Amstrad plc",  "PC1640 DD",    MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
COMP( 1987, pc1640hd20, pc1640,     0,      pc1640hd,   pc1640, pc1640_state,  0,      "Amstrad plc",  "PC1640 HD20",  MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
COMP( 1987, pc1640hd30, pc1640,     0,      pc1640hd,   pc1640, pc1640_state,  0,      "Amstrad plc",  "PC1640 HD30",  MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )