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
|
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
Chips 82C245 CGA LCD/CRT Controller
TODO:
- currently assumes LCD screen, CRT timings and CGA palette not used.
- SMARTMAP, intelligently map colors to gray scales.
**********************************************************************/
#include "emu.h"
#include "82c425.h"
#include "video/cgapal.h"
#include "screen.h"
#define LOG_SETUP (1U << 1)
#define LOG_REGS (1U << 2)
//#define VERBOSE (LOG_REGS|LOG_SETUP)
//#define LOG_OUTPUT_FUNC osd_printf_info
#include "logmacro.h"
#define LOGSETUP(...) LOGMASKED(LOG_SETUP, __VA_ARGS__)
#define LOGREGS(...) LOGMASKED(LOG_REGS, __VA_ARGS__)
DEFINE_DEVICE_TYPE(F82C425, f82c425_device, "82c425", "82C425 LCD/CRT Controller")
f82c425_device::f82c425_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: device_t(mconfig, F82C425, tag, owner, clock)
, device_memory_interface(mconfig, *this)
, device_video_interface(mconfig, *this)
, m_space_config("dispfont", ENDIANNESS_LITTLE, 8, 15, 0, address_map_constructor(FUNC(f82c425_device::dispfont_map), this))
, m_palette(*this, finder_base::DUMMY_TAG)
, m_crt_lcd_cb(*this)
{
}
// default display/font storage
void f82c425_device::dispfont_map(address_map &map)
{
if (!has_configured_map(0))
map(0x0000, 0x5fff).ram();
}
void f82c425_device::io_map(address_map &map)
{
map.global_mask(0x0f);
map(0x04, 0x04).rw(FUNC(f82c425_device::address_r), FUNC(f82c425_device::address_w));
map(0x05, 0x05).rw(FUNC(f82c425_device::register_r), FUNC(f82c425_device::register_w));
map(0x08, 0x0c).rw(FUNC(f82c425_device::extreg_r), FUNC(f82c425_device::extreg_w));
}
//-------------------------------------------------
// memory_space_config - return a description of
// any address spaces owned by this device
//-------------------------------------------------
device_memory_interface::space_config_vector f82c425_device::memory_space_config() const
{
return space_config_vector {
std::make_pair(0, &m_space_config)
};
}
void f82c425_device::device_start()
{
assert(clock() > 0);
// arbitrary startup values */
m_horiz_total = 0xff;
m_max_scan_row = 0x0f;
m_vert_total = 0x7f;
m_horiz_sync_pos = 1;
m_vert_sync_pos = 1;
m_horiz_disp = m_vert_disp = 0;
m_vert_sync_pos = 0;
m_vert_total_adj = 0;
m_cursor_start_scan = m_cursor_end_scan = m_cursor_addr = 0;
m_disp_start_addr = 0;
m_blink_state = false;
m_cursor_state = false;
m_dispen_state = false;
// default startup values (from datasheet)
m_hsync_width = 0x40;
m_vsync_width = 0x72;
save_item(NAME(m_register_address));
save_item(NAME(m_horiz_total));
save_item(NAME(m_horiz_disp));
save_item(NAME(m_horiz_sync_pos));
save_item(NAME(m_vert_total));
save_item(NAME(m_vert_total_adj));
save_item(NAME(m_vert_disp));
save_item(NAME(m_vert_sync_pos));
save_item(NAME(m_max_scan_row));
save_item(NAME(m_cursor_start_scan));
save_item(NAME(m_cursor_end_scan));
save_item(NAME(m_disp_start_addr));
save_item(NAME(m_cursor_addr));
save_item(NAME(m_light_pen_addr));
save_item(NAME(m_light_pen_latched));
save_item(NAME(m_ac_control));
save_item(NAME(m_threshold));
save_item(NAME(m_shift_param));
save_item(NAME(m_hsync_width));
save_item(NAME(m_vsync_width));
save_item(NAME(m_timing_control));
save_item(NAME(m_func_control));
save_item(NAME(m_mode_control));
save_item(NAME(m_color_select));
save_item(NAME(m_input_status));
save_item(NAME(m_blink_state));
save_item(NAME(m_cursor_state));
save_item(NAME(m_dispen_state));
}
void f82c425_device::device_reset()
{
m_register_address = 0;
m_light_pen_addr = 0;
m_light_pen_latched = false;
// reset values (from datasheet)
m_ac_control = 0x00;
m_threshold = 0x00;
m_shift_param = 0x00;
m_func_control = 0x00;
m_mode_control = 0x00;
m_color_select = 0x00;
m_input_status = 0x00;
}
uint8_t f82c425_device::register_r()
{
uint8_t data = 0x00;
switch (m_register_address)
{
case 0x00: data = m_horiz_total; break;
case 0x01: data = m_horiz_disp; break;
case 0x02: data = m_horiz_sync_pos; break;
case 0x03: break;
case 0x04: data = m_vert_total; break;
case 0x05: data = m_vert_total_adj; break;
case 0x06: data = m_vert_disp; break;
case 0x07: data = m_vert_sync_pos; break;
case 0x08: break;
case 0x09: data = m_max_scan_row; break;
case 0x0a: data = m_cursor_start_scan; break;
case 0x0b: data = m_cursor_end_scan; break;
case 0x0c: data = (m_disp_start_addr >> 8) & 0xff; break;
case 0x0d: data = (m_disp_start_addr >> 0) & 0xff; break;
case 0x0e: data = (m_cursor_addr >> 8) & 0xff; break;
case 0x0f: data = (m_cursor_addr >> 0) & 0xff; break;
case 0x10: data = (m_light_pen_addr >> 8) & 0xff; m_light_pen_latched = false; break;;
case 0x11: data = (m_light_pen_addr >> 0) & 0xff; m_light_pen_latched = false; break;
// extension registers
case 0xd9: data = m_ac_control; break;
case 0xda: data = m_threshold; break;
case 0xdb: data = m_shift_param; break;
case 0xdc: data = m_hsync_width; break;
case 0xdd: data = m_vsync_width; break;
case 0xde: data = m_timing_control; break;
case 0xdf: data = m_func_control; break;
}
LOGREGS("%s register_r: 0x%02x = 0x%02x\n", machine().describe_context(), m_register_address, data);
return data;
}
void f82c425_device::register_w(uint8_t data)
{
if (m_register_address < 0x12 && (m_register_address & 0xfe) != 0x0e)
LOGREGS("%s register_w: 0x%02x = 0x%02x\n", machine().describe_context(), m_register_address, data);
if (m_register_address < 0x12 && (m_register_address & 0xfe) != 0x0e)
LOGSETUP(" * %02x <= %3u [%02x] %s\n", m_register_address, data, data, std::array<char const *, 18>
{{ "R00 - Horizontal Total", "R01 - Horizontal Displayed", "R02 - Horizontal Sync Position",
"R03 - Ignored", "R04 - Vertical Total", "R05 - Vertical Total Adjust",
"R06 - Vertical Displayed", "R07 - Vertical Sync Position", "R08 - Ignored",
"R09 - Maximum Scans/Row", "R0A - Cursor Start Scan", "R0B - Cursor End Scan",
"R0C - Start Address High", "R0D - Start Address Low", "R0E - Cursor Address High",
"R0F - Cursor Address Low", "R10 - Light Pen High", "R11 - Light Pen Low" }}[m_register_address]);
else if (m_register_address >= 0xd8)
LOGSETUP(" * %02x <= %3u [%02x] %s\n", m_register_address, data, data, std::array<char const *, 8>
{{ "RD8 - Ignored", "RD9 - AC Control", "RDA - Threshold",
"RDB - Shift Parameter", "RDC - Horizontal Sync Width", "RDD - Vertical Sync Width",
"RDE - Timing Control", "RDF - Function Control" }}[m_register_address & 0x07]);
switch (m_register_address)
{
case 0x00: m_horiz_total = data; break;
case 0x01: m_horiz_disp = data; break;
case 0x02: m_horiz_sync_pos = data; break;
case 0x03: break;
case 0x04: m_vert_total = data & 0x7f; break;
case 0x05: m_vert_total_adj = data & 0x0f; break;
case 0x06: m_vert_disp = data & 0x7f; break;
case 0x07: m_vert_sync_pos = data & 0x7f; break;
case 0x08: break;
case 0x09: m_max_scan_row = data & 0x0f; break;
case 0x0a: m_cursor_start_scan = data & 0x7f; break;
case 0x0b: m_cursor_end_scan = data & 0x1f; break;
case 0x0c: m_disp_start_addr = ((data & 0x3f) << 8) | (m_disp_start_addr & 0x00ff); break;
case 0x0d: m_disp_start_addr = ((data & 0xff) << 0) | (m_disp_start_addr & 0xff00); break;
case 0x0e: m_cursor_addr = ((data & 0x3f) << 8) | (m_cursor_addr & 0x00ff); break;
case 0x0f: m_cursor_addr = ((data & 0xff) << 0) | (m_cursor_addr & 0xff00); break;
case 0x10: break;
case 0x11: break;
// extension registers
case 0xd9: m_ac_control = data; break;
case 0xda: m_threshold = data; break;
case 0xdb: m_shift_param = data; break;
case 0xdc: m_hsync_width = data; break;
case 0xdd: m_vsync_width = data; break;
case 0xde: m_timing_control = data; break;
case 0xdf: m_func_control = data; m_crt_lcd_cb(BIT(data, 3)); break;
}
}
uint8_t f82c425_device::extreg_r(offs_t offset)
{
uint8_t data = 0xff;
switch (offset)
{
case 0x00: data = m_mode_control; break;
case 0x01: data = m_color_select; break;
case 0x02: m_input_status ^= 9; data = m_input_status; break; // TODO: bits 0/3 behaviour controlled by Function Control
case 0x03: m_light_pen_latched = false; break;
case 0x04: /*assert_light_pen_input();*/ break;
}
LOGREGS("%s extreg_r: 0x%02x = 0x%02x\n", machine().describe_context(), offset | 0x3d8, data);
return data;
}
void f82c425_device::extreg_w(offs_t offset, uint8_t data)
{
LOGREGS("%s extreg_w: 0x%02x = 0x%02x\n", machine().describe_context(), offset | 0x3d8, data);
LOGSETUP(" * %02x <= %3u [%02x] %s\n", offset | 0x3d8, data, data, std::array<char const *, 5>
{{ "3D8 - Mode Control", "3D9 - Color Select", "3DA - Input Status",
"3DB - Clear Light Pen", "3DC - Set Light Pen" }}[offset]);
switch (offset)
{
case 0x00: m_mode_control = data; break;
case 0x01: m_color_select = data; break;
case 0x02: break;
case 0x03: m_light_pen_latched = false; break;
case 0x04: /*assert_light_pen_input();*/ break;
}
}
uint8_t f82c425_device::mem_r(offs_t offset)
{
uint8_t data = 0x00;
if (BIT(m_func_control, 0)) // Decode Enable
{
if (!BIT(m_func_control, 1) || (offset & 0x2000))
data = space().read_byte(offset);
else
data = space().read_byte(offset + 0x4000);
}
return data;
}
void f82c425_device::mem_w(offs_t offset, uint8_t data)
{
if (BIT(m_func_control, 0)) // Decode Enable
{
if (!BIT(m_func_control, 1) || (offset & 0x2000))
space().write_byte(offset, data);
else
space().write_byte(offset + 0x4000, data);
}
}
bool f82c425_device::cursor_visible(uint16_t ma, uint8_t ra)
{
if (m_cursor_addr == ma && ra >= (m_cursor_start_scan & 0x1f) && ra <= (m_cursor_end_scan & 0x1f) + 1)
return true;
else
return false;
}
void f82c425_device::update_blink_cursor_state(uint64_t frame)
{
const uint8_t blink_rate = (m_vsync_width >> 4) + 1;
// blink state
if (frame % blink_rate == 0)
m_blink_state = !m_blink_state;
// cursor state
switch (m_cursor_start_scan & 0x60)
{
case 0x20: // cursor off
m_cursor_state = false;
break;
case 0x00:
case 0x40: // cursor blinked at blink rate
if (frame % blink_rate == 0)
m_cursor_state = !m_cursor_state;
break;
case 0x60: // cursor blinked at half blink rate
if (frame % (blink_rate * 2) == 0)
m_cursor_state = !m_cursor_state;
break;
}
}
uint32_t f82c425_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
if (BIT(m_mode_control, 3)) // video enable bit
{
for (uint16_t y = cliprect.min_y; y <= cliprect.max_y; y++)
{
uint8_t ra = y % (m_max_scan_row + 1);
switch (m_mode_control & 0x13)
{
case 0x00: lcd_draw_line_text(bitmap, ra, y, screen.frame_number()); break; // 40 x 25 Text
case 0x01: lcd_draw_line_text(bitmap, ra, y, screen.frame_number()); break; // 80 x 25 Text
case 0x02: lcd_draw_line_gfx2(bitmap, ra, y, screen.frame_number()); break; // 320 x 200 Graphics
case 0x12: lcd_draw_line_gfx1(bitmap, ra, y, screen.frame_number()); break; // 640 x 200 Graphics
}
}
}
else
{
bitmap.fill(0, cliprect);
}
return 0;
}
void f82c425_device::lcd_draw_line_text(bitmap_rgb32 &bitmap, uint8_t ra, uint16_t y, uint64_t frame)
{
const rgb_t *palette = m_palette->palette()->entry_list_raw();
const uint8_t *disp_ram = (uint8_t *)space().get_read_ptr(m_disp_start_addr);
const uint8_t *font_ram = (uint8_t *)space().get_read_ptr(0x4000 + (BIT(m_func_control, 2) * 0x1000));
const uint16_t ma = (y >> 3) * m_horiz_disp;
uint32_t *p = &bitmap.pix(y);
// update blink/cursor state for this frame
if (y == 0) update_blink_cursor_state(frame);
for (int x = 0; x < m_horiz_disp; x++)
{
const uint16_t offset = ((ma + x) << 1) & 0x3fff;
const uint8_t chr = disp_ram[offset];
const uint8_t attr = disp_ram[offset + 1];
uint8_t data = 0x00;
// attribute colors
uint8_t fg = BIT(attr, 0, 3);
uint8_t bg = BIT(attr, 4, 3);
// alternate font
if (BIT(m_func_control, 6) && BIT(attr, 3))
data = font_ram[(chr * 8) + ra + 0x1000];
else
data = font_ram[(chr * 8) + ra];
// blinking
if (BIT(m_mode_control, 5) && BIT(attr, 7) && !m_blink_state)
data = 0x00;
// cursor
if (m_cursor_state && cursor_visible(ma + x, ra))
data = 0xff;
// inverted video
if (BIT(m_func_control, 7))
data ^= 0xff;
for (int i = 7; i >= 0; i--)
{
*p++ = palette[BIT(data, i) ? fg : bg];
if (m_horiz_disp == 40) // 40 columns double pixel width
*p++ = palette[BIT(data, i) ? fg : bg];
}
}
}
void f82c425_device::lcd_draw_line_gfx2(bitmap_rgb32 &bitmap, uint8_t ra, uint16_t y, uint64_t frame)
{
const rgb_t *palette = m_palette->palette()->entry_list_raw();
const uint8_t *disp_ram = (uint8_t *)space().get_read_ptr(m_disp_start_addr);
const uint16_t ma = (y >> 1) * 80;
uint32_t *p = &bitmap.pix(y);
// TODO: implement 4-level gray scale scheme (shouldn't use gray scale palette)
for (int x = 0; x < 80; x++)
{
// even scanlines begin at B8000h, odd scanlines at BA000h
uint8_t data = disp_ram[((ma + x) & 0x1fff) | ((y & 1) << 13)];
// inverted video
if (BIT(m_func_control, 7))
data ^= 0xff;
for (int pixel = 0; pixel < 4; pixel++)
{
*p++ = palette[((data >> 6) & 3) * 2];
*p++ = palette[((data >> 6) & 3) * 2];
data <<= 2;
}
}
}
void f82c425_device::lcd_draw_line_gfx1(bitmap_rgb32 &bitmap, uint8_t ra, uint16_t y, uint64_t frame)
{
const rgb_t *palette = m_palette->palette()->entry_list_raw();
const uint8_t *disp_ram = (uint8_t *)space().get_read_ptr(m_disp_start_addr);
const uint16_t ma = (y >> 1) * 80;
uint32_t *p = &bitmap.pix(y);
for (int x = 0; x < 80; x++)
{
uint8_t data = disp_ram[((ma + x) & 0x1fff) | ((y & 1) << 13)];
// inverted video
if (BIT(m_func_control, 7))
data ^= 0xff;
for (int pixel = 0; pixel < 8; pixel++)
{
*p++ = palette[BIT(data, 7) ? 7 : 0];
data <<= 1;
}
}
}
|