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Revision: 1.15
Committed: Wed Dec 3 02:14:56 2014 UTC (9 years, 5 months ago) by root
Branch: MAIN
Changes since 1.14: +7 -7 lines
Log Message:
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File Contents

# Content
1 #!/opt/bin/perl
2
3 #
4 # Copyright(C) 2014 Marc Alexander Lehmann <vt102@schmorp.de>
5 #
6 # vt102 is free software; you can redistribute it and/or modify it under
7 # the terms of the GNU General Public License as published by the Free
8 # Software Foundation; either version 3, or (at your option) any later
9 # version.
10 #
11 # vt102 is distributed in the hope that it will be useful, but WITHOUT
12 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 # for more details.
15 #
16
17 # If this file contains embedded ROMs, the above copyright notice does
18 # not apply to them.
19
20 use strict;
21 #use common::sense;
22
23 my $VT102 = 1;
24 my $VT131 = 0;
25 my $AVO = 1;
26
27 shift, ($VT102 = 0), ($AVO = 0) if $ARGV[0] =~ /^-?-vt100$/;
28 shift, ($VT102 = 0) if $ARGV[0] =~ /^-?-vt100\+avo$/;
29 shift if $ARGV[0] =~ /^-?-vt102$/;
30 shift, ($VT131 = 1) if $ARGV[0] =~ /^-?-vt131$/;
31
32 if ($ARGV[0] =~ /^-/) {
33 die <<EOF;
34
35 VT102, A VT100/101/102/131 SIMULATOR
36
37 Usage:
38
39 $0 [option] [program [args]]
40
41 Examples:
42
43 $0 bash
44 $0 telnet towel.blinkenlights.nl
45 $0 curl http://artscene.textfiles.com/vt100/trekvid.vt
46 $0 curl http://artscene.textfiles.com/vt100/surf.vt # in 3d!
47
48 Option can be one of:
49
50 --vt100
51 --vt100+avo
52 --vt102
53 --vt131
54
55 Non-obvious special keys are:
56
57 SET UP Home
58 BACKSPACE Rubout
59 CAPS LOCK Prior/PgUp
60 NO SCROLL Next/PgDown
61 BREAK End
62
63 Set-Up Guide:
64
65 http://vt100.net/docs/vt102-ug/chapter3.html#S3.6
66
67 Author:
68
69 Marc Lehmann <vt102\@schmorp.de>
70
71 EOF
72 }
73
74 #############################################################################
75 # ROM/hardware init
76
77 my $PTY; # the pty we allocated, if any
78 my $KBD = 1;
79
80 my $ROMS = do {
81 binmode DATA;
82 local $/;
83 <DATA>
84 };
85
86 0x6801 == length $ROMS or die "corrupted rom image";
87
88 my @M = (0xff) x 65536; # main memory, = (0xff) x 65536;
89
90 # populate mem with rom contents
91 if ($VT102) {
92 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x2000, 0x2000;
93 @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROMS, 0x4000, 0x2000;
94 @M[0xa000 .. 0xa7ff] = unpack "C*", substr $ROMS, 0x6000, 0x0800 if $VT131;
95 } else {
96 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x0000, 0x2000;
97 }
98
99 #############################################################################
100 # 8085 CPU registers and I/O support
101
102 # 8080/8085 registers
103 # b, c, d, e, h, l, a
104 my ($A, $B, $C, $D, $E, $H, $L, $A);
105 my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC);
106
107 my $RST = 0; # 8080 pending interrupts
108 my $INTMASK = 7; # 8085 half interrupts
109 my $INTPEND = 0; # 8085 half interrupts
110
111 my $x; # dummy temp for instructions
112
113 my $CLK; # rather inexact clock
114
115 #############################################################################
116 # the dreaded NVR1400 chip. not needed to get it going, but provided anyway
117
118 # nvram
119 my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
120 my $NVRADDR;
121 my $NVRDATA;
122 my $NVRLATCH;
123
124 my @NVRCMD = (
125 sub { $NVRDATA = ($NVRDATA << 1) + $_[1]; }, # 0 accept data
126 sub { $NVRADDR = ($NVRADDR << 1) + $_[1]; }, # 1 accept addr
127 sub { ($NVRDATA <<= 1) & 0x4000 }, # 2 shift out
128 undef, # 3 not used, will barf
129 sub { $NVR[$_[0]] = $NVRDATA & 0x3fff; }, # 4 write
130 sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase
131 sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read
132 sub { }, # 7 standby
133 );
134
135 my @NVR_BITIDX;
136 $NVR_BITIDX[1 << $_] = 9 - $_ for 0..9;
137
138 # the nvr1400 state machine. what a monster
139 sub nvr() {
140 my $a1 = $NVR_BITIDX[(~$NVRADDR ) & 0x3ff];
141 my $a0 = $NVR_BITIDX[(~$NVRADDR >> 10) & 0x3ff];
142
143 # printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA;
144
145 $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
146 }
147
148 #############################################################################
149 # I/O ports - output
150
151 my $DC11_REVERSE = 0;
152
153 my $XON = 1; # false if terminal wants us to pause
154 my $PUSARTCMD;
155
156 my @KXMIT; # current scan queue
157 my %KXMIT; # currently pressed keys
158 my @KQUEUE; # key event queue
159 my $KXCNT; # count for debouncew
160 my @PUSARTRECV;
161 my $KSTATUS;
162
163 sub out_00 { # pusartdata
164 # handle xon/xoff, but also pass it through
165 if ($_[0] == 0x13) {
166 $XON = 0;
167 return;#d#
168 } elsif ($_[0] == 0x11) {
169 $XON = 1;
170 return;#d#
171 }
172
173 syswrite $PTY, chr $_[0];
174
175 $INTPEND |= 1;
176 }
177
178 sub out_01 {
179 $PUSARTCMD = shift;
180
181 $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy
182 $INTPEND |= 2 if $PUSARTCMD & 0x04 && !@PUSARTRECV; # VT102, 6.5 rxrdy, needed for some reason
183 }
184
185 sub out_02 { } # baudrate generator
186
187 sub out_23 { } # unknown
188 sub out_27 { } # unknown
189 sub out_2f { } # unknown, connected to in 0f
190
191 sub out_42 { } # brightness
192
193 sub out_62 {
194 $NVRLATCH = shift;
195 }
196
197 sub out_a2 {
198 my $dc11 = 0x0f & shift;
199
200 $DC11_REVERSE = 1 if $dc11 == 0b1010;
201 $DC11_REVERSE = 0 if $dc11 == 0b1011;
202 }
203
204 sub out_c2 { } # unknown
205 sub out_d2 { } # 0..3 == 80c/132c/60hz/50hz
206
207 sub out_82 {
208 # keyboard
209
210 # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INS L1
211 # CLICK STARTSCAN ONLINE LOCKED | L1 L2 L3 L4
212 $KSTATUS = $_[0];
213
214 # start new scan unless scan in progress
215 if (($_[0] & 0x40) && !@KXMIT) {
216 # do not reply with keys in locked mode
217 # or during post (0xff),
218 # mostly to skip init and not fail POST,
219 # and to send startup keys only when terminal is ready
220 unless (($_[0] & 0x10) || ($_[0] == 0xff) || ($VT102 && $INTMASK == 0x07)) {
221 if ($KXCNT <= 0 && @KQUEUE) {
222 my $c = shift @KQUEUE;
223
224 if ($c < 0) { # key up
225 delete $KXMIT{-$c};
226 $KXCNT = 10;
227 } elsif ($c > 0) { # key down
228 undef $KXMIT{$c};
229 $KXCNT = 10;
230 } else { # delay
231 $KXCNT = 100;
232 }
233 }
234
235 --$KXCNT;
236 @KXMIT = sort keys %KXMIT;
237 }
238
239 $RST |= 1;
240 }
241 }
242
243 #############################################################################
244 # I/O ports - input
245
246 my $NVRBIT;
247 my $LBA6; # twice the frequenxy of LBA7
248
249 sub in_00 { # pusart data
250 # interrupt not generated here, because infinite
251 # speed does not go well with the vt102.
252
253 shift @PUSARTRECV
254 }
255
256 sub in_01 { # pusart status
257 # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY
258 0x85 + (@PUSARTRECV && 0x02)
259 }
260
261 sub in_22 { # modem buffer(?)
262 # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
263 0x20
264 }
265
266 sub in_0f { 0xff } # vt102 unknown, connected to out 2f
267
268 sub in_42 { # flag buffer
269 ++$LBA6;
270
271 $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA6 & 0x3) == 0x2;
272
273 # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
274
275 my $f = 0x85 | $NVRBIT;
276
277 $f |= 0x02 unless $AVO;
278 $f |= 0x40 if $LBA6 & 0x2;
279
280 $f
281 }
282
283 sub in_82 { # tbmt keyboard uart
284 return 0x7f unless @KXMIT;
285
286 $RST |= 1;
287 shift @KXMIT
288 }
289
290 sub in_03 { 0xff } # vt102 unknown, printer uart input?
291 sub in_0b { 0xff } # vt102 unknown
292 sub in_17 { 0xff } # vt102 unknown, printer status clear by reading?
293 sub in_1b { 0xff } # vt102 unknown
294
295 #############################################################################
296 # 8085 cpu opcodes and flag handling
297
298 sub sf { # set flags (ZSC - AP not implemented)
299 $FS = $_[0] & 0x080;
300 $FZ = !($_[0] & 0x0ff);
301 $FC = $_[0] & 0x100;
302
303 $_[0] &= 0xff;
304 }
305
306 sub sf8 { # set flags (ZSC - AP not implemented)
307 $FS = $_[0] & 0x080;
308 $FZ = !($_[0] & 0x0ff);
309 $FC = 0;
310 }
311
312 sub sf_nc { # set flags except carry
313 $FS = $_[0] & 0x080;
314 $FZ = ($_[0] & 0x0ff) == 0;
315
316 $_[0] &= 0xff;
317 }
318
319 my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0x00 .. 0xff;
320
321 my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A);
322 my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity
323
324 $op[0x00] = '';
325
326 # mov r,r / r,M / M,r
327 for my $s (0..7) {
328 for my $d (0..7) {
329 $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]"; # mov
330 }
331 }
332
333 $op[0x76] = 'die "HLT"'; # hlt (mov m,m)
334
335 # mvi r / M
336 $op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
337
338 $op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
339 $op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
340 $op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
341 $op[0x31] = '$SP = IMM16' ; # lxi
342
343 $op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
344 $op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
345 $op[0x32] = '$M[IMM16 ] = $A'; # sta
346
347 $op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b
348 $op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d
349 $op[0x3a] = '$A = $M[IMM16]'; # lda
350
351 $op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld
352 $op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld
353
354 sub inxdcx($$$) {
355 $x = $_[0] * 256 + $_[1] + $_[2];
356 ($_[0], $_[1]) = (($x >> 8) & 0xff, $x & 0xff);
357 }
358
359 $op[0x03] = 'inxdcx $B, $C, 1'; # inx
360 $op[0x13] = 'inxdcx $D, $E, 1'; # inx
361 $op[0x23] = 'inxdcx $H, $L, 1'; # inx
362 $op[0x33] = '$SP++' ; # inx
363 $op[0x0b] = 'inxdcx $B, $C, -1'; # dcx
364 $op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
365 $op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
366 $op[0x3b] = '--$SP' ; # dcx
367
368 # "no carry" doesn't seem to be needed for vt100 - optimize?
369 $op[0x04 + $_ * 8] = "sf_nc ++$reg[$_]" for 0..7; # inr
370 $op[0x05 + $_ * 8] = "sf_nc --$reg[$_]" for 0..7; # dcr
371
372 $op[0x07] = ' $FC = $A & 0x80; $A = (($A << 1) + ($FC && 0x01)) & 0xff '; # rlc
373 $op[0x17] = ' ($FC, $A) = ($A & 0x80, (($A << 1) + ($FC && 0x01)) & 0xff)'; # ral
374
375 $op[0x0f] = ' $FC = $A & 0x01; $A = ($A >> 1) | ($FC && 0x80) '; # rrc
376 $op[0x1f] = ' ($FC, $A) = ($A & 0x01, ($A >> 1) | ($FC && 0x80))'; # rar
377
378 $op[0x2f] = '$A ^= 0xff'; # cma
379
380 # getting this insn wrong (its the only 16 bit insn to modify flags)
381 # wasted three of my best days with mindless vt102 rom reverse engineering
382 sub dad {
383 $x = $H * 256 + $L + $_[0];
384
385 ($H, $L) = (($x >> 8) & 0xff, $x & 0xff);
386 $FC = $x > 0xffff;
387 }
388
389 $op[0x09] = 'dad $B * 256 + $C'; # dad
390 $op[0x19] = 'dad $D * 256 + $E'; # dad
391 $op[0x29] = 'dad $H * 256 + $L'; # dad
392 $op[0x39] = 'dad $SP '; # dad
393
394 $op[0x80 + $_] = 'sf $A += + ' . $reg[$_] for 0..7; # add
395 $op[0x88 + $_] = 'sf $A += ($FC && 1) + ' . $reg[$_] for 0..7; # adc
396 $op[0x90 + $_] = 'sf $A -= + ' . $reg[$_] for 0..7; # sub
397 $op[0x98 + $_] = 'sf $A -= ($FC && 1) + ' . $reg[$_] for 0..7; # sbb
398 $op[0xa0 + $_] = 'sf8 $A &= ' . $reg[$_] for 0..7; # ana
399 $op[0xa8 + $_] = 'sf8 $A ^= ' . $reg[$_] for 0..7; # xra
400 $op[0xb0 + $_] = 'sf8 $A |= ' . $reg[$_] for 0..7; # ora
401 $op[0xb8 + $_] = 'sf $x = $A - ' . $reg[$_] for 0..7; # cmp
402 # possible todo: optimize ora a, maybe xra a
403
404 $op[0xc6] = 'sf $A += IMM8'; # adi
405 # ce ADI NYI
406 $op[0xd6] = 'sf $A -= IMM8'; # sui
407 # de SBI NYI
408 $op[0xe6] = 'sf8 $A &= IMM8'; # ani
409 $op[0xee] = 'sf8 $A ^= IMM8'; # xri
410 $op[0xf6] = 'sf8 $A |= IMM8'; # ori
411 $op[0xfe] = 'sf $A - IMM8'; # cpi
412
413 $op[0xc5] = 'PUSH $B; PUSH $C';
414 $op[0xd5] = 'PUSH $D; PUSH $E';
415 $op[0xe5] = 'PUSH $H; PUSH $L';
416 $op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
417
418 $op[0xc1] = '($C, $B) = (POP, POP)'; # pop
419 $op[0xd1] = '($E, $D) = (POP, POP)'; # pop
420 $op[0xe1] = '($L, $H) = (POP, POP)'; # pop
421 $op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = ($x & 0x80, $x & 0x40, $x & 0x10, $x & 0x04, $x & 0x01)'; # pop psw
422
423 $op[0xc2 + $_ * 8] = 'BRA IMM16 ' . $cc[$_] for 0..7; # jcc
424 $op[0xc3] = 'JMP IMM16'; # jmp
425
426 $op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) ' . $cc[$_] for 0..7; # ccc
427 $op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
428
429 $op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 ' . $cc[$_] for 0..7; # rcc
430 $op[0xc9] = 'JMP POP + POP * 256'; # ret
431
432 $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
433
434 $op[0xe9] = 'JMP $H * 256 + $L'; # pchl
435 # f9 SPHL NYI
436
437 $op[0x37] = '$FC = 1 '; # stc
438 $op[0x3f] = '$FC = !$FC'; # cmc
439
440 $op[0xd3] = 'OUT'; # out
441 $op[0xdb] = 'IN'; # in
442
443 $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
444
445 # e3 xthl NYI # @ 917b, hl <-> (sp)
446
447 $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete)
448 $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete)
449
450 $op[0xf3] = '$IFF = 0'; # DI
451 $op[0xfb] = '$IFF = 1'; # EI
452
453 # yeah, the fucking setup screens actually use daa...
454 $op[0x27] = '
455 my ($h, $l);
456
457 ($h, $l) = ($A >> 4, $A & 15);
458
459 if ($l > 9 || $FA) {
460 sf $A += 6;
461 ($h, $l) = ($A >> 4, $A & 15);
462 }
463
464 if ($h > 9 || $FC) {
465 $h += 6;
466 $A = ($h * 16 + $l) & 0xff;
467 }
468 '; # daa, almost certainly borked, also, acarry not set by sf
469
470 #############################################################################
471 # print cpu status for debugging purposes
472
473 # print cpu status, for debugging
474 sub status {
475 my $PC = shift || $PC;
476
477 printf "%04x/%04x A=%02x BC=%02x:%02x DE=%02x:%02x HL=%02x:%02x ZSCAP=%s: %02x %s\n",
478 $PC, $SP,
479 $A, $B, $C, $D, $E, $H, $L,
480 ($FZ ? "1" : "0")
481 . ($FS ? "1" : "0")
482 . ($FC ? "1" : "0")
483 . ($FA ? "1" : "0")
484 . ($FP ? "1" : "0"),
485 $M[$PC], $op[$M[$PC]];
486 }
487
488 #############################################################################
489 # video emulation
490
491 binmode STDOUT;
492
493 my @CHARMAP = (
494 " " , "\x{29eb}", "\x{2592}", "\x{2409}",
495 "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}",
496 "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}",
497 "\x{2510}", "\x{250c}", "\x{2514}", "\x{253c}",
498 "\x{23ba}", "\x{23bb}", "\x{2500}", "\x{23bc}",
499 "\x{23bd}", "\x{251c}", "\x{2524}", "\x{2534}",
500 "\x{252c}", "\x{2502}", "\x{2264}", "\x{2265}",
501 "\x{03c0}", "\x{2260}", "\x{00a3}", "\x{00b7}",
502 (map chr, 0x020 .. 0x7e),
503 );
504
505 utf8::encode $_ for @CHARMAP;
506
507 my @SGR; # sgr sequences for attributes
508
509 for (0x00 .. 0xff) {
510 my $sgr = "";
511
512 # ~1 sgr 5 blink
513 # ~2 sgr 4 underline
514 # ~4 sgr 1 bold
515 # 0x80 in attr, sgr 7, reversed
516
517 $sgr .= ";5" unless $_ & 0x01;
518 $sgr .= ";4" unless $_ & 0x02;
519 $sgr .= ";1" unless $_ & 0x04;
520 $sgr .= ";7" if $_ & 0x80;
521
522 $SGR[$_] = "\e[${sgr}m";
523 }
524
525 my @LED = $VT102
526 ? qw(L1 INSERT DSR CTS LOCKED LOCAL SCAN BEEP)
527 : qw(L4 L3 L2 L1 LOCKED LOCAL SCAN BEEP);
528
529 # display screen
530 sub display {
531 my $i = 0x2000;
532
533 my $leds = join " ", map $KSTATUS & 2**$_ ? "\e[7m$LED[$_]\e[m" : "$LED[$_]", reverse 0 .. $#LED;
534
535 my $scr = sprintf "\e[H--- LED [ %s ] CLK %d\e[K\n", $leds, $CLK;
536
537 $scr .= "\e[?5" . ($DC11_REVERSE ? "h" : "l");
538
539 line:
540 for my $y (0 .. 25) { # ntsc, two vblank delay lines, up to 24 text lines
541 my $prev_sgr;
542
543 $scr .= sprintf "%2d \xe2\x94\x82", $y;
544
545 for (0..139) {
546 my $c = $M[$i];
547
548 if ($c == 0x7f) { # also 0xff, but the firmware avoids that
549 $scr .= "\e[m\xe2\x94\x82\e[K\n";
550
551 my $a1 = $M[$i + 1];
552 my $a0 = $M[$i + 2];
553
554 $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
555
556 next line;
557 }
558
559 my $sgr = $SGR[ ($M[$i++ + 0x1000] & 15) | ($c & 0x80)];
560
561 $scr .= $prev_sgr = $sgr if $sgr ne $prev_sgr;
562
563 $scr .= $CHARMAP[$c & 0x7f];
564 }
565
566 $scr .= "\e[K\nvideo overflow\e[K\n";
567 last;
568 }
569
570 $scr .= "\e[m\e[J";
571
572 syswrite STDOUT, $scr;
573 }
574
575 #############################################################################
576 # keyboard handling
577
578 # 0x080 shift, 0x100 ctrl
579 my %KEYMAP = (
580 "\t" => 0x3a,
581 "\r" => 0x64,
582 "\n" => 0x44,
583
584 "\x00" => 0x77 | 0x100, # CTRL-SPACE
585 "\x1c" => 0x45 | 0x100, # CTRL-\
586 "\x1d" => 0x14 | 0x100, # CTRL-]
587 "\x1e" => 0x24 | 0x100, # CTRL-~
588 "\x1f" => 0x75 | 0x100, # CTRL-?
589
590 # hardcoded rxvt keys
591 "\e" => 0x2a, # ESC
592 "\e[3~" => 0x03, # DC
593 "\e[5~" => 0x7e, # CAPS LOCK (prior)
594 "\e[6~" => 0x6a, # NO SCROLL (next)
595 "\e[A" => 0x30, # UP
596 "\e[B" => 0x22, # DOWN
597 "\e[C" => 0x10, # RIGHT
598 "\e[D" => 0x20, # LEFT
599 "\e[a" => 0x30 | 0x080, # UP
600 "\e[b" => 0x22 | 0x080, # DOWN
601 "\e[c" => 0x10 | 0x080, # RIGHT
602 "\e[d" => 0x20 | 0x080, # LEFT
603 "\e[7~" => 0x7b, # SETUP (home)
604 "\e[8~" => 0x23, # BREAK (end)
605 "\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end)
606 "\x7f" => 0x33, # BACKSPACE
607
608 "\e[11~" => 0x32, # F1
609 "\e[11~" => 0x42, # F2
610 "\e[11~" => 0x31, # F3
611 "\e[11~" => 0x41, # F4
612 );
613
614 @KEYMAP{map chr, 0x20 .. 0x40, 0x5b .. 0x7e} = unpack "C*", pack "H*",
615 "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9" # 20..40
616 . "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4"; # 5b..7e
617
618 $KEYMAP{"\x1f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
619 $KEYMAP{"\x20" ^ $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
620
621 my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
622 $KEYMATCH = qr{^($KEYMATCH)}s;
623
624 my %KMOD;
625
626 sub key {
627 my ($key) = @_;
628
629 push @KQUEUE, -0x7c if !($key & 0x100) && delete $KMOD{0x7c}; # ctrl-up
630 push @KQUEUE, -0x7d if !($key & 0x080) && delete $KMOD{0x7d}; # shift-up
631
632 push @KQUEUE, 0x7c if $key & 0x100 && !$KMOD{0x7c}++; # ctrl-down
633 push @KQUEUE, 0x7d if $key & 0x080 && !$KMOD{0x7d}++; # shift-down
634
635 $key &= 0x7f;
636 push @KQUEUE, $key, -$key;
637 }
638
639 my $STDIN_BUF;
640
641 sub stdin_parse {
642 key $KEYMAP{$1}
643 while $STDIN_BUF =~ s/$KEYMATCH//;
644
645 # skip input we can't decipher
646 substr $STDIN_BUF, 0, 1, "";
647 }
648
649 if ($KBD) {
650 system "stty -icanon -icrnl -inlcr -echo min 1 time 0";
651 eval q{ sub END { system "stty sane" } };
652 $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 };
653 }
654
655 #############################################################################
656 # initial key input, to set up online mode etc.
657 # could be done via nvram defaults
658
659 @KQUEUE = (
660 0x7b, -0x7b, # setup
661 0, # delay
662 0x28, -0x28, # 4, toggle local/online
663 0x38, -0x38, # 5, setup b
664 0, # delay
665 (0x10, -0x10) x 2, # cursor right
666 0x37, -0x37, # 6 toggle soft scroll
667 (0x10, -0x10) x 1, # cursor right
668 0x37, -0x37, # 6 toggle autorepeat off
669 (0x10, -0x10) x 8, # cursor right
670 0x37, -0x37, # 6 toggle keyclick
671 (0x10, -0x10) x 1, # cursor right
672 $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
673 (0x10, -0x10) x 7, # cursor right
674 0x37, -0x37, # 6 toggle wrap around
675 0x7b, -0x7b, # leave setup
676 );
677
678 #############################################################################
679 # process/pty management
680
681 require IO::Pty;
682 $PTY = IO::Pty->new;
683
684 my $slave = $PTY->slave;
685
686 $PTY->set_winsize (24, 80);
687
688 unless (fork) {
689 $ENV{TERM} = $VT102 ? "vt102" : "vt100";
690
691 close $PTY;
692
693 open STDIN , "<&", $slave;
694 open STDOUT, ">&", $slave;
695 open STDERR, ">&", $slave;
696
697 system "stty ixoff erase ^H";
698
699 $PTY->make_slave_controlling_terminal;
700 $PTY->close_slave;
701
702 @ARGV = "sh" unless @ARGV;
703 exec @ARGV;
704 }
705
706 $PTY->close_slave;
707
708 #############################################################################
709 # the actual hardware simulator
710
711 my @ICACHE; # compiled instruction cache
712
713 while () {
714 # execute extended basic blocks
715 $PC = ($ICACHE[$PC] ||= do {
716 my $pc = $PC;
717
718 my $insn = "";
719
720 # the jit compiler
721 for (0..31) {
722 my $imm;
723 my $op = $op[$M[$pc++]];
724
725 for ($op) {
726 s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
727 s/\bPOP\b/\$M[\$SP++]/g; # pop byte from stack
728
729 s/\bIMM16\b/$imm \/\/= $M[$pc++] + $M[$pc++] * 256/xge; # 16 bit insn immediate
730 s/\bIMM8\b /$imm \/\/= $M[$pc++] /xge; # 8 bit insn immediate
731
732 s/\bPC\b/$pc/ge; # PC at end of insn
733 s/\bBRA\b/return/g; # conditional jump
734 s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump
735
736 s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge;
737 s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge;
738 }
739
740 $insn .= "$op;\n";
741 }
742
743
744 $insn .= $pc;
745 $insn =~ s/\x00.*$//s;
746
747 eval "use integer; sub { $insn }" or die "$insn: $@"
748 })->();
749
750 ++$CLK;
751
752 # things we do from time too time only
753 unless ($CLK & 0xf) {
754 # do I/O
755
756 unless ($CLK & 0xfff) {
757
758 # pty/serial I/O
759 unless ((@PUSARTRECV >= 128) || @KQUEUE || !$PTY) {
760 my $rin = ""; (vec $rin, fileno $PTY, 1) = 1;
761
762 if (select $rin, undef, undef, 0) {
763 sysread $PTY, my $buf, 256;
764 push @PUSARTRECV, unpack "C*", $buf;
765 }
766 }
767
768 # keyboard input
769 if ($KBD) {
770 while (select my $rin = "\x01", undef, undef, 0) {
771 sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF
772 or last;
773 }
774
775 stdin_parse if length $STDIN_BUF;
776 }
777 }
778
779 # kick off various interrupts
780
781 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though)
782 #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy
783
784 # kick off vertical retrace form time to time
785 unless ($CLK & 0x1ff) {
786 $RST |= 4; # vertical retrace
787 }
788
789 # handle video hardware
790 unless ($CLK & 0x3fff) {
791 display;
792 }
793 }
794
795 # the interrupt logic
796 if (($RST || ($INTPEND & ~$INTMASK)) && $IFF) {
797 # rst 1 kbd data available
798 # rst 2 pusart xmit+recv flag
799 # rst 4 vertical retrace
800 # 5.5 vt125 mb7 trans ready (serial send?)
801 # 6.5 vt125 mb7 read ready (something modem?)
802 # 7.5 vt125 mb7 vblank h(?)
803 # trap vt125 mbi init h(?)
804 my $vec;
805
806 $x = $INTPEND & ~$INTMASK;
807
808 if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1;
809 } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2;
810 } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4;
811 # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # the vt102 firmware doesn't like combined interrupts
812 } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
813 } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
814 } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
815 } else {
816 die;
817 }
818
819 $M[--$SP] = $PC >> 8;
820 $M[--$SP] = $PC & 0xff;
821 $PC = $vec;
822
823 $IFF = 0;
824 }
825 }
826
827 #############################################################################
828 # roms in the data section + one newline
829 #
830 # vt100 @ 0x0000+0x0800 23-032E2
831 # vt100 @ 0x0800+0x0800 23-061E2
832 # vt100 @ 0x1000+0x0800 23-033E2
833 # vt100 @ 0x1800+0x0800 23-034E2
834 #
835 # vt102 @ 0x0000+0x2000 23-226E4
836 # vt102 @ 0x8000+0x2000 23-225E4
837 #
838 # vt131 @ 0xa000+0x0800 23-280E2
839 #
840
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