/
mekd3.cpp
1077 lines (882 loc) · 34 KB
/
mekd3.cpp
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
// license:BSD-3-Clause
// copyright-holders: 68bit
/******************************************************************************
Motorola Evaluation Kit 6802 D3 - MEK6802D3
Keypad commands:
RS (Reset) - Reset, wired to the CPU reset line
EX (Escape) - Typically aborts user program, or exits command.
M - Memory display/change
Digits 5 and 6 show the entered data, and are blank unless it differs.
Digits 7 and 8 show the actual data at the address.
GO - increase the address.
M - decreases the address.
FS - Offset calculation. Enter address, then press 'GO'.
EX - exits memory display.
RD - Register display/alter
RD - advance to next register.
T/B - trace a single instruction
GO - continue user code.
EX - exits register display.
GO - Go to user program.
If no address is entered then it uses the pseudo PC, it continues.
Enter the address and press 'Go' to use that entered address.
It firstly checks that there is RAM at the stack pointer. ???
T/B - Trace one instruction.
FS T/B - Breakpoint editor
GO - advance to next breakpoing, up to 8, then loops.
FS - insert a breakpoint
FC - deactivate breakpoint
EX - exits breakpoing editor.
P/L - Punch tape
The 300/1200 baud switch needs to be set, and the same rate selected.
FS - Set 300 baud mode, J-BUG compatible.
FC - Set 1200 baud mode, has checksum.
At the 'b' prompt enter the beginning address of the data, then 'GO'.
At the 'E' prompt enter the last address of the data, the 'GO' to
start writing to the tape. There is a 30 second leader of $ff.
M - Skip to Verify tape.
FS P/L - Load from tape
FS - Set 300 baud mode, J-BUG compatible.
FC - Set 1200 baud mode, has checksum.
GO - Start load.
M - Skip to Verify tape.
FS 0 to F
One of 16 user defined functions. Press FS then one number key 0 to F.
A pointer to a table of 16 function addresses should be set at 0x8102.
FC - Clears the 'FS' flag.
ASCII terminal commands:
B - Breakpoing display, up to eight.
C - Continue user program
D - Delete all breakpoints
E <addr> - Examine a block of memory, with ASCII chars.
Carriage Return - exit examine memory.
G <addr> - Go to the user program at <addr>.
Keypad Escape - breaks execution.
L - Load from audio tape.
The 300/1200 baud switch needs to be set, and the same rate selected.
The 300 baud rate is J-BUG compatible. The 1200 includes a checksum.
M <addr> - Memory display at <addr>
Linefeed - Advance to next address.
M or ^ - Previous address.
Space - Redisplay data.
Carriage Return - exit memory display.
O <addr> - Offset calculation.
N - Trace one instruction.
O - Offset load from tape.
P - Punch tape.
R - Register display and edit.
Space - Advance to next register.
Carriage Return - exit register display.
<nn> - Change register value.
S <addr> - Set a breakpoint at the <addr>.
T <nn> - Trace <nn> instructions.
U <addr> - Delete the breakpoint at <addr>
V - Verify tape.
Ctrl-E - Clear screen.
! - Execute user function stored in user register 2, aka $816a
" - Execute user function stored in user register 3, aka $816c
# - Execute user function stored in user register 4, aka $816e
$FDFD - Remove breakpoints. Documentation suggests assigning this address
to a user function when debugging, to clean up breakpoints.
TODO
There are references to a MEK6802EA product, probably an Editor Assembler
that might have been for this system. Perhaps it was ROMable and that might
be nice to add here.
There was a color graphics evaluation board, the MEK68VDG, using the
MC6847. It must have had it's own expansion ROM as the D3DUG2 ROM for the
MEK68R2 is specific to the R2 and has no support for the 6847. This might be
a nice addition if documentation and/or a ROM can be found.
The RAM paging might need revising.
The ROM support is still TODO.
******************************************************************************/
#include "emu.h"
#include "cpu/m6800/m6800.h"
#include "machine/input_merger.h"
#include "machine/ram.h"
#include "machine/6821pia.h"
#include "machine/6850acia.h"
#include "machine/mc14411.h"
#include "machine/mc6846.h"
#include "machine/clock.h"
#include "machine/timer.h"
#include "video/pwm.h"
#include "bus/rs232/rs232.h"
#include "imagedev/cassette.h"
#include "sound/wave.h"
#include "speaker.h"
#include "mekd3.lh"
// MEK68R2
#include "machine/terminal.h"
#include "video/mc6845.h"
#include "emupal.h"
#include "screen.h"
#include "render.h"
namespace {
#define XTAL_MEKD3 3.579545_MHz_XTAL
class mekd3_state : public driver_device
{
public:
mekd3_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_ram(*this, RAM_TAG)
, m_ram_bank(*this, "ram_bank")
, m_mainirq(*this, "mainirq")
, m_mainnmi(*this, "mainnmi")
, m_mc6846(*this, "mc6846")
, m_kpd_pia(*this, "kpd_pia")
, m_display(*this, "display")
, m_keypad_columns(*this, "COL%u", 0)
// MEK68IO
, m_pia_io1(*this, "pia_io1")
, m_pia_io2(*this, "pia_io2")
, m_acia_io1(*this, "acia_io1")
, m_acia_cas(*this, "acia_cas")
, m_brg(*this, "brg")
, m_cass(*this, "cassette")
, m_console_enable(*this, "CONSOLE_ENABLE")
, m_rs232_tx_baud(*this, "RS232_TX_BAUD")
, m_rs232_rx_baud(*this, "RS232_RX_BAUD")
, m_rs232_cts_route(*this, "RS232_CTS_ROUTE")
, m_rs232_dcd_route(*this, "RS232_DCD_ROUTE")
, m_cas_baud(*this, "CAS_BAUD")
// MEK68R2
, m_mc6845(*this, "mc6845")
, m_palette(*this, "palette")
, m_screen(*this, "screen")
, m_p_chargen(*this, "chargen")
, m_video_ram(*this, "videoram")
, m_r2_pia(*this, "r2_pia")
, m_r2_mode(*this, "R2_MODE")
, m_r2_display_nationality(*this, "R2_DISPLAY_NATIONALITY")
, m_r2_display_format(*this, "R2_DISPLAY_FORMAT")
{ }
void mekd3(machine_config &config);
void init_mekd3();
void reset_key_w(int state);
DECLARE_INPUT_CHANGED_MEMBER(keypad_changed);
DECLARE_INPUT_CHANGED_MEMBER(rs232_cts_route_change);
DECLARE_INPUT_CHANGED_MEMBER(rs232_dcd_route_change);
private:
int keypad_cb1_r();
uint8_t keypad_key_r();
void led_digit_w(uint8_t data);
void led_segment_w(uint8_t data);
TIMER_DEVICE_CALLBACK_MEMBER(led_update);
void page_w(uint8_t data);
required_device<m6802_cpu_device> m_maincpu;
required_device<ram_device> m_ram;
required_memory_bank m_ram_bank;
required_device<input_merger_device> m_mainirq;
required_device<input_merger_device> m_mainnmi;
required_device<mc6846_device> m_mc6846;
required_device<pia6821_device> m_kpd_pia;
required_device<pwm_display_device> m_display;
required_ioport_array<4> m_keypad_columns;
uint8_t m_rom_page;
uint8_t m_ram_page;
uint8_t m_segment;
uint8_t m_digit;
bool keypad_key_pressed();
void mekd3_mem(address_map &map);
virtual void machine_start() override;
virtual void machine_reset() override;
uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
// MEK68IO
void rs232_route_cts(int state);
void rs232_route_dcd(int state);
int m_cts;
int m_dcd;
// Clocks
void write_f1_clock(int state);
void write_f2_clock(int state);
void write_f4_clock(int state);
void write_f5_clock(int state);
void write_f7_clock(int state);
void write_f8_clock(int state);
void write_f9_clock(int state);
void write_f13_clock(int state);
TIMER_DEVICE_CALLBACK_MEMBER(kansas_r);
void acia_cas_clock300_w(int state);
void acia_cas_clock1200_w(int state);
uint8_t pia_io2a_r();
required_device<pia6821_device> m_pia_io1;
required_device<pia6821_device> m_pia_io2;
required_device<acia6850_device> m_acia_io1;
required_device<acia6850_device> m_acia_cas;
required_device<mc14411_device> m_brg;
required_device<cassette_image_device> m_cass;
required_ioport m_console_enable;
required_ioport m_rs232_tx_baud;
required_ioport m_rs232_rx_baud;
required_ioport m_rs232_cts_route;
required_ioport m_rs232_dcd_route;
required_ioport m_cas_baud;
uint8_t m_cass_rx_period, m_cass_txcount;
bool m_cass_in, m_cass_inbit, m_cass_txbit, m_cass_last_txbit;
// MEK68R2
MC6845_UPDATE_ROW(update_row);
uint8_t r2_pia_pa_r();
uint8_t r2_pia_pb_r();
optional_device<mc6845_device> m_mc6845;
optional_device<palette_device> m_palette;
optional_device<screen_device> m_screen;
optional_region_ptr<uint8_t> m_p_chargen;
optional_shared_ptr<uint8_t> m_video_ram;
optional_device<pia6821_device> m_r2_pia;
optional_ioport m_r2_mode;
optional_ioport m_r2_display_nationality;
optional_ioport m_r2_display_format;
void kbd_put(uint8_t data);
uint8_t m_term_data;
};
/***********************************************************
Address Map
************************************************************/
void mekd3_state::mekd3_mem(address_map &map)
{
// User RAM banks
map(0x0000, 0x7fff).bankrw("ram_bank");
// MEK68IO User PIA
map(0x8000, 0x8003).rw(m_pia_io1, FUNC(pia6821_device::read), FUNC(pia6821_device::write));
// MEK68IO D3BUG cassette PIA
map(0x8004, 0x8007).rw(m_pia_io2, FUNC(pia6821_device::read), FUNC(pia6821_device::write));
// MEK68IO RS232 ACIA
map(0x8008, 0x8009).rw(m_acia_io1, FUNC(acia6850_device::read), FUNC(acia6850_device::write));
// MEK68IO cassette ACIA.
map(0x800a, 0x800b).rw(m_acia_cas, FUNC(acia6850_device::read), FUNC(acia6850_device::write));
// 8040-8041 MEK68VG VDG Scroll register
// 8042-8043 MEK68R2 CRT register.
map(0x8042, 0x8042).w(m_mc6845, FUNC(mc6845_device::address_w));
map(0x8043, 0x8043).rw(m_mc6845, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
// MEK68R2 PIA (Keyboard)
map(0x8044, 0x8047).rw(m_r2_pia, FUNC(pia6821_device::read), FUNC(pia6821_device::write));
// GPIA IEEE-488 8048-804F
// 8050-8057 MEK68EP PROM Programmer
// MEK6802D3 timer and I/O.
map(0x8080, 0x8087).rw(m_mc6846, FUNC(mc6846_device::read), FUNC(mc6846_device::write));
// MEK6802D3 display/keyboard PIA
map(0x8088, 0x808b).rw(m_kpd_pia, FUNC(pia6821_device::read), FUNC(pia6821_device::write));
// MEK6802D3 MCM6810 RAM
map(0x8100, 0x81ff).ram(); // system ram
// 8200 - 87ff User defined RAM
// 8800 - 8fff MEK68VDG RAM
// 9000-9fff MEK68R2 and MEK68VDG Video RAM
map(0x9000, 0x9fff).ram().share(m_video_ram);
// a000-efff ROM banks.
// D3BUG2 ROM
map(0xf000, 0xf7ff).rom();
// MEK6802D3 D3BUG ROM, MC6846 ROM
map(0xf800, 0xffff).rom();
}
/***********************************************************
Keys
************************************************************/
static INPUT_PORTS_START(mekd3)
// RESET is not wired to the key matrix.
PORT_START("RESET")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("RS") PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, mekd3_state, reset_key_w)
// PORT_CODEs are not assigned to the keypad to allow it on screen at
// the same time as the terminal or CRT console which also receive
// keyboard inputs. When a keyboard is available the keypad is of
// limited use, but still useful to interrupt code or reset the
// machine. If MAME someday allows the keyboard input focus to be
// switched then this might be redesigned.
PORT_START("COL0")
PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("M")
PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("FS")
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("7")
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("4")
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("1")
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("0")
PORT_START("COL1")
PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("EX")
PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("FC")
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("8")
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("5")
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("2")
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("F")
PORT_START("COL2")
PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("RD")
PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("P/L")
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("9")
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("6")
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("3")
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("E")
PORT_START("COL3")
PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("GO")
PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("T/B")
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("A")
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("B")
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("C")
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, keypad_changed, 0) PORT_NAME("D")
// MEK68IO
PORT_START("CONSOLE_ENABLE")
PORT_DIPNAME(0x01, 0x00, "RS-232 console")
PORT_DIPSETTING(0x01, DEF_STR(On))
PORT_DIPSETTING(0x00, DEF_STR(Off))
// RS232 baud rates available for use at socket 1.
PORT_START("RS232_TX_BAUD")
PORT_CONFNAME(0x3f, 1, "RS232 TX Baud Rate")
PORT_CONFSETTING(0x80, "110")
PORT_CONFSETTING(0x40, "300")
PORT_CONFSETTING(0x20, "600")
PORT_CONFSETTING(0x10, "1200")
PORT_CONFSETTING(0x08, "2400")
PORT_CONFSETTING(0x04, "3600")
PORT_CONFSETTING(0x02, "4800")
PORT_CONFSETTING(0x01, "9600")
PORT_START("RS232_RX_BAUD")
PORT_CONFNAME(0x3f, 1, "RS232 RX Baud Rate")
PORT_CONFSETTING(0x80, "110")
PORT_CONFSETTING(0x40, "300")
PORT_CONFSETTING(0x20, "600")
PORT_CONFSETTING(0x10, "1200")
PORT_CONFSETTING(0x08, "2400")
PORT_CONFSETTING(0x04, "3600")
PORT_CONFSETTING(0x02, "4800")
PORT_CONFSETTING(0x01, "9600")
// RS232 CTS and DCD routing at socket 3. These need to be
// jumpered low if not driven by the RS232 device.
PORT_START("RS232_CTS_ROUTE")
PORT_CONFNAME(0x1, 0, "RS232 CTS") PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, rs232_cts_route_change, 0)
PORT_CONFSETTING(0, "Jumper Low")
PORT_CONFSETTING(1, "Pass Through")
PORT_START("RS232_DCD_ROUTE")
PORT_CONFNAME(0x1, 0, "RS232 DCD") PORT_CHANGED_MEMBER(DEVICE_SELF, mekd3_state, rs232_dcd_route_change, 0)
PORT_CONFSETTING(0, "Jumper Low")
PORT_CONFSETTING(1, "Pass Through")
// A mechanical switch at the edge of the board set the cassette baud
// rate. The software could not control or read this rate setting and
// since D3BUG used a different format for 1200 baud it had to promote
// for the rate too.
PORT_START("CAS_BAUD")
PORT_CONFNAME(0x01, 0, "Cassette Baud Rate")
PORT_CONFSETTING(0x1, "1200")
PORT_CONFSETTING(0x0, "300")
// MEK68R2
PORT_START("R2_MODE")
PORT_DIPNAME(0x1, 0, "R2 Mode")
PORT_DIPSETTING(0, "Normal")
PORT_DIPSETTING(1, "Dumb terminal")
PORT_START("R2_DISPLAY_NATIONALITY")
PORT_DIPNAME(0x1, 1, "Display nationality")
PORT_DIPSETTING(0, "US")
PORT_DIPSETTING(1, "Europe")
PORT_START("R2_DISPLAY_FORMAT")
PORT_DIPNAME(0x0003, 2, "Display format")
PORT_DIPSETTING(0, "16 lines of 32 characters")
PORT_DIPSETTING(1, "16 lines of 64 characters")
PORT_DIPSETTING(2, "20 lines of 80 characters")
PORT_DIPSETTING(3, "User defined")
INPUT_PORTS_END
/***********************************************************
RAM and ROM paging
************************************************************/
void mekd3_state::page_w(uint8_t data)
{
m_rom_page = data & 0x07;
// TODO switch the ROM bank entry.
m_ram_page = (data >> 3) & 0x07;
m_ram_bank->set_entry(m_ram_page);
}
/***********************************************************
Keypad
************************************************************/
void mekd3_state::reset_key_w(int state)
{
m_maincpu->set_input_line(INPUT_LINE_RESET, state ? CLEAR_LINE : ASSERT_LINE);
if (!state)
{
m_mc6846->reset();
m_kpd_pia->reset();
m_kpd_pia->write(1, 2);
// MEK68IO
m_pia_io1->reset();
m_pia_io2->reset();
m_acia_io1->reset();
m_acia_cas->reset();
m_cass_rx_period = 0;
m_cass_txcount = 0;
m_cass_in = 0;
m_cass_inbit = 0;
// MEK68R2
m_mc6845->reset();
m_r2_pia->reset();
}
}
bool mekd3_state::keypad_key_pressed()
{
return (m_keypad_columns[0]->read() & m_digit) ||
(m_keypad_columns[1]->read() & m_digit) ||
(m_keypad_columns[2]->read() & m_digit) ||
(m_keypad_columns[3]->read() & m_digit);
}
INPUT_CHANGED_MEMBER(mekd3_state::keypad_changed)
{
m_kpd_pia->cb1_w(mekd3_state::keypad_key_pressed());
}
int mekd3_state::keypad_cb1_r()
{
return mekd3_state::keypad_key_pressed();
}
uint8_t mekd3_state::keypad_key_r()
{
uint8_t mux = (m_digit & 0xc0) >> 6;
uint8_t i = (m_keypad_columns[mux]->read() & m_digit) ? 0 : 0x80;
return i | m_segment;
}
/***********************************************************
Seven segment LED display
************************************************************/
// PA
void mekd3_state::led_segment_w(uint8_t data)
{
m_segment = data & 0x7f;
m_display->matrix(m_digit, m_segment);
}
// PB
void mekd3_state::led_digit_w(uint8_t data)
{
m_digit = data;
m_display->matrix(m_digit, m_segment);
// Update the keypad pressed output which depends on m_digit.
m_kpd_pia->cb1_w(mekd3_state::keypad_key_pressed());
}
/***********************************************************
MEK68IO
************************************************************/
void mekd3_state::rs232_route_cts(int state)
{
if (m_rs232_cts_route->read())
m_acia_io1->write_cts(state);
// Cache the state, in case the ioport setting changes.
m_cts = state;
}
void mekd3_state::rs232_route_dcd(int state)
{
if (m_rs232_dcd_route->read())
m_acia_io1->write_dcd(state);
// Cache the state, in case the ioport setting changes.
m_dcd = state;
}
INPUT_CHANGED_MEMBER(mekd3_state::rs232_cts_route_change)
{
if (newval)
m_acia_io1->write_cts(m_cts);
else
m_acia_io1->write_cts(0);
}
INPUT_CHANGED_MEMBER(mekd3_state::rs232_dcd_route_change)
{
if (newval)
m_acia_io1->write_dcd(m_dcd);
else
m_acia_io1->write_dcd(0);
}
void mekd3_state::write_f1_clock(int state)
{
if (BIT(m_rs232_tx_baud->read(), 0))
m_acia_io1->write_txc(state);
if (BIT(m_rs232_rx_baud->read(), 0))
m_acia_io1->write_rxc(state);
}
void mekd3_state::write_f2_clock(int state)
{
if (BIT(m_rs232_tx_baud->read(), 1))
m_acia_io1->write_txc(state);
if (BIT(m_rs232_rx_baud->read(), 1))
m_acia_io1->write_rxc(state);
}
void mekd3_state::write_f4_clock(int state)
{
if (BIT(m_rs232_tx_baud->read(), 2))
m_acia_io1->write_txc(state);
if (BIT(m_rs232_rx_baud->read(), 2))
m_acia_io1->write_rxc(state);
}
void mekd3_state::write_f5_clock(int state)
{
if (BIT(m_rs232_tx_baud->read(), 3))
m_acia_io1->write_txc(state);
if (BIT(m_rs232_rx_baud->read(), 3))
m_acia_io1->write_rxc(state);
}
void mekd3_state::write_f7_clock(int state)
{
if (BIT(m_rs232_tx_baud->read(), 4))
m_acia_io1->write_txc(state);
if (BIT(m_rs232_rx_baud->read(), 4))
m_acia_io1->write_rxc(state);
// 1200 baud also drives the cassette ACIA
if (m_cas_baud->read() == 1)
acia_cas_clock1200_w(state);
}
void mekd3_state::write_f8_clock(int state)
{
if (BIT(m_rs232_tx_baud->read(), 5))
m_acia_io1->write_txc(state);
if (BIT(m_rs232_rx_baud->read(), 5))
m_acia_io1->write_rxc(state);
}
void mekd3_state::write_f9_clock(int state)
{
if (BIT(m_rs232_tx_baud->read(), 6))
m_acia_io1->write_txc(state);
if (BIT(m_rs232_rx_baud->read(), 6))
m_acia_io1->write_rxc(state);
// 300 baud also drives the cassette ACIA
if (m_cas_baud->read() == 0)
acia_cas_clock300_w(state);
}
void mekd3_state::write_f13_clock(int state)
{
if (BIT(m_rs232_tx_baud->read(), 7))
m_acia_io1->write_txc(state);
if (BIT(m_rs232_rx_baud->read(), 7))
m_acia_io1->write_rxc(state);
}
TIMER_DEVICE_CALLBACK_MEMBER(mekd3_state::kansas_r)
{
m_cass_rx_period++;
// Turn 1200/2400Hz to a bit
uint8_t cassin = (m_cass->input() > +0.04) ? 1 : 0;
uint8_t inbit = m_cass_inbit;
if (cassin != m_cass_in)
{
// Transition, now check the period.
inbit = (m_cass_rx_period < 12) ? 1 : 0;
m_cass_in = cassin;
m_cass_rx_period = 0;
}
else if (m_cass_rx_period > 32)
{
// Idle the ACIA if there is no data.
m_cass_rx_period = 32;
inbit = 1;
}
if (inbit != m_cass_inbit)
{
m_acia_cas->write_rxd(inbit);
m_cass_inbit = inbit;
}
}
void mekd3_state::acia_cas_clock300_w(int state)
{
// The Kansas City cassette format encodes a '0' bit by four cycles of
// a 1200 Hz sine wave, and a '1' bit as eight cycles of 2400 Hz,
// giving a 300 baud rate.
//
// The clock rate to the ACIA is 16x the baud rate and is divided by 2
// to get the 2400 Hz rate, or divided by 4 to get the 1200 Hz rate.
// Sync the period phase on TX bit transitions.
if (m_cass_txbit != m_cass_last_txbit)
{
m_cass_txcount = 0;
m_cass_last_txbit = m_cass_txbit;
}
if (m_cass_txbit)
m_cass->output(BIT(m_cass_txcount, 1) ? +1.0 : -1.0); // 2400Hz
else
m_cass->output(BIT(m_cass_txcount, 2) ? +1.0 : -1.0); // 1200Hz
m_cass_txcount++;
m_acia_cas->write_txc(state);
m_acia_cas->write_rxc(state);
}
void mekd3_state::acia_cas_clock1200_w(int state)
{
// For the 1200 baud rate the number of cycles in reduced to just one
// cycle at 1200 Hz and two at 2400 Hz.
// Sync the period phase on TX bit transitions.
if (m_cass_txbit != m_cass_last_txbit)
{
m_cass_txcount = 0;
m_cass_last_txbit = m_cass_txbit;
}
if (m_cass_txbit)
m_cass->output(BIT(m_cass_txcount, 3) ? +1.0 : -1.0); // 2400Hz
else
m_cass->output(BIT(m_cass_txcount, 4) ? +1.0 : -1.0); // 1200Hz
m_cass_txcount++;
m_acia_cas->write_txc(state);
m_acia_cas->write_rxc(state);
}
uint8_t mekd3_state::pia_io2a_r()
{
uint32_t console_enable = m_console_enable->read();
// bit 1 (0x02) is a jumper to set RS232 terminal mode when set.
return console_enable ? 0x02 : 0x00;
}
/***********************************************************
MEK68R2
This might in future be moved to a slot device, on a bus.
************************************************************/
// Delivery of keyboard inputs to the MEK68R2 keyboard is disabled when on
// views with the RS232 terminal, assuming that this keyboard is not present.
// Also disable delivery when the 'MEK68R2 present' jumper indicates it is
// disabled, assuming that this keyboard is not present.
void mekd3_state::kbd_put(uint8_t data)
{
uint8_t view = machine().render().first_target()->view();
if (view == 0)
return;
m_term_data = data;
// Triggers on the falling edge.
m_r2_pia->ca1_w(ASSERT_LINE);
m_r2_pia->ca1_w(CLEAR_LINE);
m_r2_pia->ca1_w(ASSERT_LINE);
}
// PA0 to PA6 - Keyboard data.
// PA7 - Display nationality, 0 USA, 1 Europe.
uint8_t mekd3_state::r2_pia_pa_r()
{
uint8_t ret = m_term_data;
int8_t display_nationality = m_r2_display_nationality->read();
m_term_data = 0;
return ret | (display_nationality << 7);
}
// PB0 - Mode: 0 normal, 1 dumb terminal.
// PB1,2,3 - N/C
// PB4 - User defined
// PB5 - Light pen control.
// PB7, PB6 - Display format.
// 00 - 16 lines of 32 characters.
// 01 - 16 lines of 64 characters.
// 10 - 20 lines of 80 characters.
// 11 - User defined.
uint8_t mekd3_state::r2_pia_pb_r()
{
int8_t display_format = m_r2_display_format->read();
int8_t mode = m_r2_mode->read();
return (display_format << 6) | mode;
}
MC6845_UPDATE_ROW(mekd3_state::update_row)
{
const pen_t *pen = m_palette->pens();
int x = 0;
for (int column = 0; column < x_count; column++)
{
uint8_t code = m_video_ram[(ma + column) & 0xfff];
int dcursor = (column == cursor_x);
if (BIT(code, 7))
{
/* Lores 6 pixel character.
-----------
| D1 | D0 |
| D3 | D2 |
| D5 | D4 |
-----------
D6 - 1 Grey tone, 0 brightness.
*/
int pixel = ((ra & 0x0c) >> 1) + 1;
int dout = BIT(code, pixel);
int grey = BIT(code, 6);
int color = ((dcursor ^ dout) && de) << (grey ^ 1);
bitmap.pix(y, x++) = pen[color];
bitmap.pix(y, x++) = pen[color];
bitmap.pix(y, x++) = pen[color];
bitmap.pix(y, x++) = pen[color];
pixel--;
dout = BIT(code, pixel);
color = ((dcursor ^ dout) && de) << (grey ^ 1);
bitmap.pix(y, x++) = pen[color];
bitmap.pix(y, x++) = pen[color];
bitmap.pix(y, x++) = pen[color];
bitmap.pix(y, x++) = pen[color];
}
else
{
offs_t address = ra < 8 ? ((code & 0x7f) << 3) | (ra & 0x07) : 0;
uint8_t data = m_p_chargen[address];
for (int bit = 0; bit < 8; bit++)
{
int dout = BIT(data, 7);
int color = ((dcursor ^ dout) && de) << 1;
bitmap.pix(y, x++) = pen[color];
data <<= 1;
}
}
}
}
/***********************************************************
************************************************************/
void mekd3_state::init_mekd3()
{
uint8_t* ROM = memregion("maincpu")->base();
// Hack to the trace timer delay, which is 0x000e by default, but
// that did not produce proper timing for tracing.
// 15 half works sometimes??
// 16 to 19 half works, gets to user code but not to the next instruction!
// 20 will step a nop but not a branch.
// 21 also steps a branch.
// 22 can overstep!
ROM[0xf80c] = 21;
}
void mekd3_state::machine_start()
{
uint8_t* RAM = m_ram->pointer();
m_ram_bank->configure_entries(0, 8, RAM, 0x8000);
save_item(NAME(m_rom_page));
save_item(NAME(m_ram_page));
save_item(NAME(m_segment));
save_item(NAME(m_digit));
save_item(NAME(m_cts));
save_item(NAME(m_dcd));
save_item(NAME(m_cass_rx_period));
save_item(NAME(m_cass_txcount));
save_item(NAME(m_cass_in));
save_item(NAME(m_cass_inbit));
save_item(NAME(m_cass_txbit));
save_item(NAME(m_cass_last_txbit));
save_item(NAME(m_term_data));
}
void mekd3_state::machine_reset()
{
m_rom_page = 0;
m_ram_page = 0;
m_ram_bank->set_entry(0);
// Avoid triggering an early interrupt when CA1 lowered. The mc6821
// driver resets CA1 high and to trigger on a high to low
// transition. The mekd3 programs CA1 to trigger on a low to high
// transition and configuring this earlier here is adequate.
m_kpd_pia->write(1, 2);
m_brg->rsa_w(CLEAR_LINE);
m_brg->rsb_w(ASSERT_LINE);
m_cass_rx_period = 0;
m_cass_txcount = 0;
m_cass_in = 0;
m_cass_inbit = 0;
// Write low here if jumpered low.
if (!m_rs232_cts_route->read())
m_acia_io1->write_cts(0);
if (!m_rs232_dcd_route->read())
m_acia_io1->write_dcd(0);
// MEK68R2
m_r2_pia->ca1_w(ASSERT_LINE);
m_r2_pia->ca2_w(ASSERT_LINE);
m_r2_pia->cb1_w(0);
m_r2_pia->cb2_w(0);
}
/***********************************************************
Machine
************************************************************/
static DEVICE_INPUT_DEFAULTS_START(terminal)
DEVICE_INPUT_DEFAULTS("RS232_RXBAUD", 0xff, RS232_BAUD_9600)
DEVICE_INPUT_DEFAULTS("RS232_TXBAUD", 0xff, RS232_BAUD_9600)
DEVICE_INPUT_DEFAULTS("RS232_DATABITS", 0xff, RS232_DATABITS_8)
DEVICE_INPUT_DEFAULTS("RS232_PARITY", 0xff, RS232_PARITY_NONE)
DEVICE_INPUT_DEFAULTS("RS232_STOPBITS", 0xff, RS232_STOPBITS_1)
DEVICE_INPUT_DEFAULTS_END
void mekd3_state::mekd3(machine_config &config)
{
M6802(config, m_maincpu, XTAL_MEKD3); // 894.8 kHz clock
m_maincpu->set_ram_enable(false);
m_maincpu->set_addrmap(AS_PROGRAM, &mekd3_state::mekd3_mem);
RAM(config, m_ram).set_default_size("256K").set_default_value(0);
INPUT_MERGER_ANY_HIGH(config, m_mainirq).output_handler().set_inputline(m_maincpu, M6802_IRQ_LINE);
INPUT_MERGER_ANY_HIGH(config, m_mainnmi).output_handler().set_inputline(m_maincpu, INPUT_LINE_NMI);
// LED display
PWM_DISPLAY(config, m_display).set_size(8, 7);
m_display->set_segmask(0xff, 0x7f);
config.set_default_layout(layout_mekd3);
SPEAKER(config, "mono").front_center();
CASSETTE(config, m_cass);
m_cass->set_default_state(CASSETTE_STOPPED | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED);
m_cass->add_route(ALL_OUTPUTS, "mono", 0.05);
// Keypad and display PIA. CA2 and CB2 are NC.
PIA6821(config, m_kpd_pia);
m_kpd_pia->readpa_handler().set(FUNC(mekd3_state::keypad_key_r));
m_kpd_pia->readcb1_handler().set(FUNC(mekd3_state::keypad_cb1_r));
m_kpd_pia->writepa_handler().set(FUNC(mekd3_state::led_segment_w));
m_kpd_pia->writepb_handler().set(FUNC(mekd3_state::led_digit_w));
m_kpd_pia->ca1_w(0);
m_kpd_pia->irqa_handler().set(m_mainnmi, FUNC(input_merger_device::in_w<0>));
m_kpd_pia->irqb_handler().set(m_mainnmi, FUNC(input_merger_device::in_w<1>));
// CP1, CP2, /CTG, /CTC are available at SK1, and not used here.
MC6846(config, m_mc6846, XTAL_MEKD3 / 4); // Same as the cpu clock
m_mc6846->out_port().set(FUNC(mekd3_state::page_w));
m_mc6846->cto().set(m_kpd_pia, FUNC(pia6821_device::ca1_w)); // trace timer
m_mc6846->irq().set(m_mainirq, FUNC(input_merger_device::in_w<0>));
// MEK68IO
// A 'user' PIA, I/O available at SK6.
PIA6821(config, m_pia_io1);
m_pia_io1->irqa_handler().set(m_mainnmi, FUNC(input_merger_device::in_w<2>));
m_pia_io1->irqb_handler().set(m_mainirq, FUNC(input_merger_device::in_w<1>));
// Largely a 'user' PIA, I/O available at SK5.
// PA0 can optionally be an audio bit input, at TP1.
// PA1 is a jumper mode input, and low by default.
// PA2 can optionally be an audio bit output, at TP2.
PIA6821(config, m_pia_io2);
m_pia_io2->readpa_handler().set(FUNC(mekd3_state::pia_io2a_r));
m_pia_io2->irqa_handler().set(m_mainirq, FUNC(input_merger_device::in_w<2>));
m_pia_io2->irqb_handler().set(m_mainirq, FUNC(input_merger_device::in_w<3>));
// RS232 ACIA
// /RTS, /CTS and /DCD are available at SK3.
ACIA6850(config, m_acia_io1, 0);
m_acia_io1->txd_handler().set("rs232", FUNC(rs232_port_device::write_txd));
m_acia_io1->rts_handler().set("rs232", FUNC(rs232_port_device::write_rts));
m_acia_io1->irq_handler().set(m_mainirq, FUNC(input_merger_device::in_w<4>));
MC14411(config, m_brg, XTAL(1'843'200));
m_brg->out_f<1>().set(FUNC(mekd3_state::write_f1_clock));
m_brg->out_f<2>().set(FUNC(mekd3_state::write_f2_clock));
m_brg->out_f<4>().set(FUNC(mekd3_state::write_f4_clock));
m_brg->out_f<4>().set(FUNC(mekd3_state::write_f5_clock));
m_brg->out_f<7>().set(FUNC(mekd3_state::write_f7_clock));
m_brg->out_f<8>().set(FUNC(mekd3_state::write_f8_clock));