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
|
// license:BSD-3-Clause
// copyright-holders:Vas Crabb
/***************************************************************************
IBM PC/AT and PS/2 keyboard controllers
IBM used Intel UPI-41 microcontrollers to implement bidirectional
keyboard communication from the PC/AT and PS/2. On the PS/2, the
microcontroller also handles mouse communication. The PS/2 host
interface to the keyboard/mouse controller is backwards-compatible
for documented commands. However a number of undocumented commands
are no longer implemented, the pin assignments are different, and
interrupt outputs are latched externally using a 74ALS74 at ZM87.
Many of the ICs that provide functional compatibility with the AT
and/or PS/2 "8042" keyboard controllers do not incorporate actual
UPI-41 microcontroller cores. This even applies to some directly
equivalent 40-pin DIPs such as the JETkey "Keyboard BIOS" V3.0
and V5.0, which were found to be Samsung Electronics ASICs when
decapped.
PC/AT I/O pin assignments:
P10: NC no connection
P11: NC no connection
P12: NC no connection
P13: NC no connection
P14: -RAM SEL enable external RAM low disables
P15: manufacturing setting low disables
P16: SW1 CRT adapter switch low for CGA
P17: +KBD INH inhibit keyboard active low
P20: RC reset CPU active low
P21: A20 GATE enable A20 line active high
P22: NC no connection
P23: NC no connection
P24: +OPT BUF FULL output buffer full active high
P25: NC no connection
P26: open collector KBD CLK inverted
P27: open collector KBD DATA not inverted
TEST0: KBD CLK not inverted
TEST1: KBD DATA not inverted
PS/2 I/O pin assignments
P10: KYBD DATA not inverted
P11: MOUSE DATA not inverted
P12: keyboard/mouse power fuse low if blown
P13: no connection
P14: no connection
P15: no connection
P16: no connection
P17: no connection
P20: +HOT RES reset CPU inverted
P21: A20 PASS enable A20 line not inverted
P22: open collector MOUSE DATA inverted
P23: open collector MOUSE CLK inverted
P24: latched as BIRQ1 rising trigger
P25: latched as IRQ12 rising trigger
P26: open collector KYBD CLK inverted
P27: open collector KYBD DATA inverted
TEST0: KYBD CLK not inverted
TEST1: MOUSE CLK not inverted
Notes:
* PS/2 BIRQ1 and IRQ12 are cleard by reading data.
* PS/2 BIRQ1 and IRQ12 are active low, but we use ASSERT_LINE here.
* PS/2 IRQ12 is open collector for sharing with cards.
TODO:
* Move display type and key lock controls to drivers.
* Expose power fuse failure.
***************************************************************************/
/*
* References:
*
* http://bitsavers.org/pdf/ibm/pc/at/6183355_PC_AT_Technical_Reference_Mar86.pdf
* http://bitsavers.org/pdf/ibm/pc/ps2/84X1508_PS2_Model_80_Technical_Reference_Apr87.pdf
* http://halicery.com/Hardware/Intel%208042%20and%208048/index.html
* https://web.archive.org/web/20180124085559/http://computer-engineering.org/ps2protocol
*
* The Intel UPI-41AH/42AH datasheet identifies the following variants:
*
* Device Firmware Application Ports
* 8242PC Phoenix Technologies AT, PS/2, EISA kbd+aux
* 8242BB IBM AT, PS/2, EISA, PCI kbd+aux
* 8242WA Award Software AT kbd
* 8242WB Award Software AT kbd+aux
*
*/
#include "emu.h"
#include "at_keybc.h"
#define LOG_COMMAND (1U << 1)
#define LOG_STATUS (1U << 2)
//#define VERBOSE (LOG_GENERAL|LOG_COMMAND)
#include "logmacro.h"
namespace {
ROM_START(at_kbc)
ROM_REGION(0x0800, "mcu", 0)
ROM_SYSTEM_BIOS(0, "ibm", "IBM 1983") // 1983 IBM controller BIOS
ROMX_LOAD("1503033.bin", 0x0000, 0x0800, CRC(5a81c0d2) SHA1(0100f8789fb4de74706ae7f9473a12ec2b9bd729), ROM_BIOS(0))
ROM_SYSTEM_BIOS(1, "ptl", "PTL 1986") // unknown controller BIOS, (c) 1985, 1986 PTL
ROMX_LOAD("yan25d05.bin", 0x0000, 0x0800, CRC(70c798f1) SHA1(ae9a79c7184a17331b70a50035ff63c757df094c), ROM_BIOS(1))
ROM_SYSTEM_BIOS(2, "award15", "Award 1985 V1.5") // MIPS Rx2030 i8742 keyboard controller
ROMX_LOAD("keyboard_1.5.bin", 0x0000, 0x0800, CRC(f86ba0f7) SHA1(1ad475451db35a76d929824c035d582279fbe3a3), ROM_BIOS(2))
ROM_END
ROM_START(ps2_kbc)
ROM_REGION(0x0800, "mcu", 0)
ROM_SYSTEM_BIOS(0, "ibm", "IBM 1987") // IBM PS/2 Model 50
ROMX_LOAD("72x8455.zm82", 0x0000, 0x0800, CRC(7da223d3) SHA1(54c52ff6c6a2310f79b2c7e6d1259be9de868f0e), ROM_BIOS(0))
ROM_SYSTEM_BIOS(1, "compaq", "Compaq 1987") // Compaq Portable 486
ROMX_LOAD("128251-001.u3", 0x0000, 0x0800, CRC(da968f1e) SHA1(ac45a4d0f30b046ada300f1d105bcf0fb2db318a), ROM_BIOS(1))
ROM_END
INPUT_PORTS_START(at_kbc)
PORT_START("P1")
PORT_BIT(0x3f, IP_ACTIVE_LOW, IPT_UNUSED)
PORT_CONFNAME(0x40, 0x00, "CRT Adapter Switch")
PORT_CONFSETTING( 0x40, "Monochrome Display Adapter")
PORT_CONFSETTING( 0x00, "Color Graphics Adapter")
PORT_CONFNAME(0x80, 0x80, "Key Lock")
PORT_CONFSETTING( 0x80, DEF_STR(Off))
PORT_CONFSETTING( 0x00, DEF_STR(On))
INPUT_PORTS_END
} // anonymous namespace
//**************************************************************************
// DEVICE TYPES
//**************************************************************************
DEFINE_DEVICE_TYPE(AT_KEYBOARD_CONTROLLER, at_keyboard_controller_device, "at_keybc", "PC/AT Keyboard Controller")
DEFINE_DEVICE_TYPE(PS2_KEYBOARD_CONTROLLER, ps2_keyboard_controller_device, "ps2_keybc", "PS/2 Keyboard/Mouse Controller")
//**************************************************************************
// KEYBOARD CONTROLLER DEVICE BASE
//**************************************************************************
uint8_t at_kbc_device_base::data_r()
{
u8 const data = m_mcu->upi41_master_r(0U);
LOG("data_r 0x%02x (%s)\n", data, machine().describe_context());
return data;
}
uint8_t at_kbc_device_base::status_r()
{
u8 const data = m_mcu->upi41_master_r(1U);
LOGMASKED(LOG_STATUS, "status_r 0x%02x%s%s%s%s%s%s%s%s (%s)\n", data,
BIT(data, 7) ? " PER" : "", BIT(data, 6) ? " RTO" : "",
BIT(data, 5) ? " TTO" : "", BIT(data, 4) ? "" : " INH",
BIT(data, 3) ? " CMD" : "", BIT(data, 2) ? " SYS" : "",
BIT(data, 1) ? " IBF" : "", BIT(data, 0) ? " OBF" : "",
machine().describe_context());
return data;
}
void at_kbc_device_base::data_w(uint8_t data)
{
LOG("data_w 0x%02x (%s)\n", data, machine().describe_context());
machine().scheduler().synchronize(timer_expired_delegate(FUNC(at_kbc_device_base::write_data), this), unsigned(data));
}
void at_kbc_device_base::command_w(uint8_t data)
{
if (VERBOSE & LOG_COMMAND)
{
switch (data)
{
case 0x00: case 0x01: case 0x02: case 0x03:
case 0x04: case 0x05: case 0x06: case 0x07:
case 0x08: case 0x09: case 0x0a: case 0x0b:
case 0x0c: case 0x0d: case 0x0e: case 0x0f:
case 0x10: case 0x11: case 0x12: case 0x13:
case 0x14: case 0x15: case 0x16: case 0x17:
case 0x18: case 0x19: case 0x1a: case 0x1b:
case 0x1c: case 0x1d: case 0x1e: case 0x1f:
LOGMASKED(LOG_COMMAND, "read controller ram indirect 0x%02x (%s)\n", data & 0x3f, machine().describe_context());
break;
case 0x20: LOGMASKED(LOG_COMMAND, "read command byte (%s)\n", machine().describe_context()); break;
case 0x21: case 0x22: case 0x23:
case 0x24: case 0x25: case 0x26: case 0x27:
case 0x28: case 0x29: case 0x2a: case 0x2b:
case 0x2c: case 0x2d: case 0x2e: case 0x2f:
case 0x30: case 0x31: case 0x32: case 0x33:
case 0x34: case 0x35: case 0x36: case 0x37:
case 0x38: case 0x39: case 0x3a: case 0x3b:
case 0x3c: case 0x3d: case 0x3e: case 0x3f:
LOGMASKED(LOG_COMMAND, "read controller ram offset 0x%02x (%s)\n", data & 0x3f, machine().describe_context());
break;
case 0x40: case 0x41: case 0x42: case 0x43:
case 0x44: case 0x45: case 0x46: case 0x47:
case 0x48: case 0x49: case 0x4a: case 0x4b:
case 0x4c: case 0x4d: case 0x4e: case 0x4f:
case 0x50: case 0x51: case 0x52: case 0x53:
case 0x54: case 0x55: case 0x56: case 0x57:
case 0x58: case 0x59: case 0x5a: case 0x5b:
case 0x5c: case 0x5d: case 0x5e: case 0x5f:
LOGMASKED(LOG_COMMAND, "write controller ram indirect 0x%02x (%s)\n", data & 0x3f, machine().describe_context());
break;
case 0x60: LOGMASKED(LOG_COMMAND, "write command byte (%s)\n", machine().describe_context()); break;
case 0x61: case 0x62: case 0x63:
case 0x64: case 0x65: case 0x66: case 0x67:
case 0x68: case 0x69: case 0x6a: case 0x6b:
case 0x6c: case 0x6d: case 0x6e: case 0x6f:
case 0x70: case 0x71: case 0x72: case 0x73:
case 0x74: case 0x75: case 0x76: case 0x77:
case 0x78: case 0x79: case 0x7a: case 0x7b:
case 0x7c: case 0x7d: case 0x7e: case 0x7f:
LOGMASKED(LOG_COMMAND, "write controller ram offset 0x%02x (%s)\n", data & 0x3f, machine().describe_context());
break;
case 0x90: case 0x91: case 0x92: case 0x93:
case 0x94: case 0x95: case 0x96: case 0x97:
case 0x98: case 0x99: case 0x9a: case 0x9b:
case 0x9c: case 0x9d: case 0x9e: case 0x9f:
LOGMASKED(LOG_COMMAND, "write output port 0x%1x (%s)\n", data & 0xf, machine().describe_context());
break;
case 0xa1: LOGMASKED(LOG_COMMAND, "get version number (%s)\n", machine().describe_context()); break;
case 0xa4: LOGMASKED(LOG_COMMAND, "test password installed (%s)\n", machine().describe_context()); break;
case 0xa5: LOGMASKED(LOG_COMMAND, "load security (%s)\n", machine().describe_context()); break;
case 0xa6: LOGMASKED(LOG_COMMAND, "enable security (%s)\n", machine().describe_context()); break;
case 0xa7: LOGMASKED(LOG_COMMAND, "disable auxiliary interface (%s)\n", machine().describe_context()); break;
case 0xa8: LOGMASKED(LOG_COMMAND, "enable auxiliary interface (%s)\n", machine().describe_context()); break;
case 0xa9: LOGMASKED(LOG_COMMAND, "auxiliary interface test (%s)\n", machine().describe_context()); break;
case 0xaa: LOGMASKED(LOG_COMMAND, "controller self-test (%s)\n", machine().describe_context()); break;
case 0xab: LOGMASKED(LOG_COMMAND, "keyboard interface test (%s)\n", machine().describe_context()); break;
case 0xac: LOGMASKED(LOG_COMMAND, "diagnostic dump (%s)\n", machine().describe_context()); break;
case 0xad: LOGMASKED(LOG_COMMAND, "disable keyboard interface (%s)\n", machine().describe_context()); break;
case 0xae: LOGMASKED(LOG_COMMAND, "enable keyboard interface (%s)\n", machine().describe_context()); break;
case 0xaf: LOGMASKED(LOG_COMMAND, "get version (%s)\n", machine().describe_context()); break;
case 0xc0: LOGMASKED(LOG_COMMAND, "read input port (%s)\n", machine().describe_context()); break;
case 0xc1: LOGMASKED(LOG_COMMAND, "poll input port low (%s)\n", machine().describe_context()); break;
case 0xc2: LOGMASKED(LOG_COMMAND, "poll input port high (%s)\n", machine().describe_context()); break;
case 0xd0: LOGMASKED(LOG_COMMAND, "read output port (%s)\n", machine().describe_context()); break;
case 0xd1: LOGMASKED(LOG_COMMAND, "write output port (%s)\n", machine().describe_context()); break;
case 0xd2: LOGMASKED(LOG_COMMAND, "write keyboard output buffer (%s)\n", machine().describe_context()); break;
case 0xd3: LOGMASKED(LOG_COMMAND, "write auxiliary output buffer (%s)\n", machine().describe_context()); break;
case 0xd4: LOGMASKED(LOG_COMMAND, "write auxiliary device (%s)\n", machine().describe_context()); break;
case 0xe0: LOGMASKED(LOG_COMMAND, "read test inputs (%s)\n", machine().describe_context()); break;
case 0xf0: case 0xf1: case 0xf2: case 0xf3:
case 0xf4: case 0xf5: case 0xf6: case 0xf7:
case 0xf8: case 0xf9: case 0xfa: case 0xfb:
case 0xfc: case 0xfd: case 0xfe: case 0xff:
LOGMASKED(LOG_COMMAND, "pulse output port 0x%1x (%s)\n", data & 0xf, machine().describe_context());
break;
default:
LOGMASKED(LOG_COMMAND, "unknown command 0x%02x (%s)\n", data, machine().describe_context());
break;
}
}
else
LOG("command_w 0x%02x (%s)\n", data, machine().describe_context());
machine().scheduler().synchronize(timer_expired_delegate(FUNC(at_kbc_device_base::write_command), this), unsigned(data));
}
void at_kbc_device_base::kbd_clk_w(int state)
{
machine().scheduler().synchronize(timer_expired_delegate(FUNC(at_kbc_device_base::set_kbd_clk_in), this), state);
}
void at_kbc_device_base::kbd_data_w(int state)
{
machine().scheduler().synchronize(timer_expired_delegate(FUNC(at_kbc_device_base::set_kbd_data_in), this), state);
}
at_kbc_device_base::at_kbc_device_base(machine_config const &mconfig, device_type type, char const *tag, device_t *owner, u32 clock)
: device_t(mconfig, type, tag, owner, clock)
, m_mcu(*this, "mcu")
, m_hot_res_cb(*this), m_gate_a20_cb(*this), m_kbd_irq_cb(*this)
, m_kbd_clk_cb(*this), m_kbd_data_cb(*this)
, m_hot_res(0U), m_gate_a20(0U), m_kbd_irq(0U)
, m_kbd_clk_in(1U), m_kbd_clk_out(1U), m_kbd_data_in(1U), m_kbd_data_out(1U)
{
}
at_kbc_device_base::~at_kbc_device_base()
{
}
void at_kbc_device_base::device_start()
{
save_item(NAME(m_hot_res));
save_item(NAME(m_gate_a20));
save_item(NAME(m_kbd_irq));
save_item(NAME(m_kbd_clk_in));
save_item(NAME(m_kbd_clk_out));
save_item(NAME(m_kbd_data_in));
save_item(NAME(m_kbd_data_out));
m_hot_res = m_gate_a20 = m_kbd_irq = 0U;
m_kbd_clk_in = m_kbd_clk_out = 1U;
m_kbd_data_in = m_kbd_data_out = 1U;
}
inline void at_kbc_device_base::set_hot_res(u8 state)
{
if (state != m_hot_res)
m_hot_res_cb((m_hot_res = state) ? ASSERT_LINE : CLEAR_LINE);
}
inline void at_kbc_device_base::set_gate_a20(u8 state)
{
if (state != m_gate_a20)
m_gate_a20_cb((m_gate_a20 = state) ? ASSERT_LINE : CLEAR_LINE);
}
inline void at_kbc_device_base::set_kbd_irq(u8 state)
{
if (state != m_kbd_irq)
m_kbd_irq_cb((m_kbd_irq = state) ? ASSERT_LINE : CLEAR_LINE);
}
inline void at_kbc_device_base::set_kbd_clk_out(u8 state)
{
if (state != m_kbd_clk_out)
m_kbd_clk_cb(m_kbd_clk_out = state);
}
inline void at_kbc_device_base::set_kbd_data_out(u8 state)
{
if (state != m_kbd_data_out)
m_kbd_data_cb(m_kbd_data_out = state);
}
inline u8 at_kbc_device_base::kbd_clk_r() const
{
return m_kbd_clk_in & m_kbd_clk_out;
}
inline u8 at_kbc_device_base::kbd_data_r() const
{
return m_kbd_data_in & m_kbd_data_out;
}
TIMER_CALLBACK_MEMBER(at_kbc_device_base::write_data)
{
m_mcu->upi41_master_w(0U, u8(u32(param)));
}
TIMER_CALLBACK_MEMBER(at_kbc_device_base::write_command)
{
m_mcu->upi41_master_w(1U, u8(u32(param)));
}
TIMER_CALLBACK_MEMBER(at_kbc_device_base::set_kbd_clk_in)
{
m_kbd_clk_in = param ? 1U : 0U;
}
TIMER_CALLBACK_MEMBER(at_kbc_device_base::set_kbd_data_in)
{
m_kbd_data_in = param ? 1U : 0U;
}
//**************************************************************************
// PC/AT KEYBOARD CONTROLLER DEVICE
//**************************************************************************
at_keyboard_controller_device::at_keyboard_controller_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock)
: at_kbc_device_base(mconfig, AT_KEYBOARD_CONTROLLER, tag, owner, clock)
{
}
at_keyboard_controller_device::~at_keyboard_controller_device()
{
}
tiny_rom_entry const *at_keyboard_controller_device::device_rom_region() const
{
return ROM_NAME(at_kbc);
}
void at_keyboard_controller_device::device_add_mconfig(machine_config &config)
{
I8042AH(config, m_mcu, DERIVED_CLOCK(1, 1));
m_mcu->p1_in_cb().set_ioport("P1");
m_mcu->p1_out_cb().set_nop();
m_mcu->p2_in_cb().set_constant(0xffU);
m_mcu->p2_out_cb().set(FUNC(at_keyboard_controller_device::p2_w));
m_mcu->t0_in_cb().set([this] () { return kbd_clk_r(); });
m_mcu->t1_in_cb().set([this] () { return kbd_data_r(); });
}
ioport_constructor at_keyboard_controller_device::device_input_ports() const
{
return INPUT_PORTS_NAME(at_kbc);
}
void at_keyboard_controller_device::p2_w(uint8_t data)
{
set_hot_res(BIT(~data, 0));
set_gate_a20(BIT(data, 1));
set_kbd_irq(BIT(data, 4));
set_kbd_clk_out(BIT(~data, 6));
set_kbd_data_out(BIT(data, 7));
}
//**************************************************************************
// PS/2 KEYBOARD/MOUSE CONTROLLER DEVICE
//**************************************************************************
uint8_t ps2_keyboard_controller_device::data_r()
{
set_kbd_irq(0U);
set_aux_irq(0U);
u8 const data = m_mcu->upi41_master_r(0U);
LOG("data_r 0x%02x (%s)\n", data, machine().describe_context());
return data;
}
uint8_t ps2_keyboard_controller_device::status_r()
{
u8 const data = m_mcu->upi41_master_r(1U);
LOGMASKED(LOG_STATUS, "status_r 0x%02x%s%s%s%s%s%s%s%s (%s)\n", data,
BIT(data, 7) ? " PER" : "", BIT(data, 6) ? " GTO" : "",
BIT(data, 5) ? " AUX_OBF" : "", BIT(data, 4) ? "" : " INH",
BIT(data, 3) ? " CMD" : "", BIT(data, 2) ? " SYS" : "",
BIT(data, 1) ? " IBF" : "", BIT(data, 0) ? " OBF" : "",
machine().describe_context());
return data;
}
void ps2_keyboard_controller_device::aux_clk_w(int state)
{
machine().scheduler().synchronize(timer_expired_delegate(FUNC(ps2_keyboard_controller_device::set_aux_clk_in), this), state);
}
void ps2_keyboard_controller_device::aux_data_w(int state)
{
machine().scheduler().synchronize(timer_expired_delegate(FUNC(ps2_keyboard_controller_device::set_aux_data_in), this), state);
}
ps2_keyboard_controller_device::ps2_keyboard_controller_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock)
: at_kbc_device_base(mconfig, PS2_KEYBOARD_CONTROLLER, tag, owner, clock)
, m_aux_irq_cb(*this)
, m_aux_clk_cb(*this), m_aux_data_cb(*this)
, m_aux_irq(0U)
, m_aux_clk_in(1U), m_aux_clk_out(1U), m_aux_data_in(1U), m_aux_data_out(1U)
, m_p2_data(0xffU)
{
}
ps2_keyboard_controller_device::~ps2_keyboard_controller_device()
{
}
tiny_rom_entry const *ps2_keyboard_controller_device::device_rom_region() const
{
return ROM_NAME(ps2_kbc);
}
void ps2_keyboard_controller_device::device_add_mconfig(machine_config &config)
{
I8042AH(config, m_mcu, DERIVED_CLOCK(1, 1));
m_mcu->p1_in_cb().set(FUNC(ps2_keyboard_controller_device::p1_r));
m_mcu->p1_out_cb().set_nop();
m_mcu->p2_in_cb().set_constant(0xffU);
m_mcu->p2_out_cb().set(FUNC(ps2_keyboard_controller_device::p2_w));
m_mcu->t0_in_cb().set([this] () { return kbd_clk_r(); });
m_mcu->t1_in_cb().set([this] () { return aux_clk_r(); });
}
void ps2_keyboard_controller_device::device_start()
{
at_kbc_device_base::device_start();
m_aux_irq_timer = timer_alloc(FUNC(ps2_keyboard_controller_device::set_aux_irq_timer_callback), this);
save_item(NAME(m_aux_irq));
save_item(NAME(m_aux_clk_in));
save_item(NAME(m_aux_clk_out));
save_item(NAME(m_aux_data_in));
save_item(NAME(m_aux_data_out));
save_item(NAME(m_p2_data));
m_aux_irq = 0U;
m_aux_clk_in = m_aux_clk_out = 1U;
m_aux_data_in = m_aux_data_out = 1U;
m_p2_data = 0xffU;
}
inline void ps2_keyboard_controller_device::set_aux_irq(u8 state)
{
if (state != m_aux_irq)
m_aux_irq_cb((m_aux_irq = state) ? ASSERT_LINE : CLEAR_LINE);
}
inline void ps2_keyboard_controller_device::set_aux_clk_out(u8 state)
{
if (state != m_aux_clk_out)
m_aux_clk_cb(m_aux_clk_out = state);
}
inline void ps2_keyboard_controller_device::set_aux_data_out(u8 state)
{
if (state != m_aux_data_out)
m_aux_data_cb(m_aux_data_out = state);
}
inline u8 ps2_keyboard_controller_device::aux_clk_r() const
{
return m_aux_clk_in & m_aux_clk_out;
}
inline u8 ps2_keyboard_controller_device::aux_data_r() const
{
return m_aux_data_in & m_aux_data_out;
}
TIMER_CALLBACK_MEMBER(ps2_keyboard_controller_device::set_aux_clk_in)
{
m_aux_clk_in = param ? 1U : 0U;
}
TIMER_CALLBACK_MEMBER(ps2_keyboard_controller_device::set_aux_data_in)
{
m_aux_data_in = param ? 1U : 0U;
}
uint8_t ps2_keyboard_controller_device::p1_r()
{
return kbd_data_r() | (aux_data_r() << 1) | 0xfcU;
}
void ps2_keyboard_controller_device::p2_w(uint8_t data)
{
set_hot_res(BIT(~data, 0));
set_gate_a20(BIT(data, 1));
set_aux_data_out(BIT(~data, 2));
set_aux_clk_out(BIT(~data, 3));
set_kbd_clk_out(BIT(~data, 6));
set_kbd_data_out(BIT(~data, 7));
if (BIT(data & ~m_p2_data, 4))
set_kbd_irq(1U);
if (BIT(data & ~m_p2_data, 5))
{
// HACK: delay raising the aux irq until compaq queues the data
if (m_mcu->pcbase() == 0x7ba)
m_aux_irq_timer->adjust(attotime::from_hz(clock() / 16));
else
set_aux_irq(1U);
}
m_p2_data = data;
}
TIMER_CALLBACK_MEMBER(ps2_keyboard_controller_device::set_aux_irq_timer_callback)
{
set_aux_irq(1U);
}
|