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Revision: 1.12
Committed: Wed Dec 3 02:10:35 2014 UTC (9 years, 5 months ago) by root
Branch: MAIN
Changes since 1.11: +1 -1 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 my $KBD = 1;
27
28 if ($ARGV[0] =~ /^-?-vt100$/) {
29 shift; $VT102 = 0; $AVO = 0;
30 }
31
32 if ($ARGV[0] =~ /^-?-vt100\+avo$/) {
33 shift; $VT102 = 0; $AVO = 1;
34 }
35
36 if ($ARGV[0] =~ /^-?-vt102$/) {
37 shift; # default
38 }
39
40 if ($ARGV[0] =~ /^-?-vt131$/) {
41 shift; $VT131 = 1;
42 }
43
44 if ($ARGV[0] =~ /^-/) {
45 die <<EOF;
46
47 VT102, A VT100/101/102/131 SIMULATOR
48
49 Usage:
50
51 $0 [option] [program [args]]
52
53 Examples:
54
55 $0 bash
56 $0 telnet towel.blinkenlights.nl
57 $0 curl http://artscene.textfiles.com/vt100/trekvid.vt
58 $0 curl http://artscene.textfiles.com/vt100/surf.vt # in 3d!
59
60 Option can be one of:
61
62 --vt100
63 --vt100+avo
64 --vt102
65 --vt131
66
67 Non-obvious special keys are:
68
69 SET UP Home
70 BACKSPACE Rubout
71 CAPS LOCK Prior/PgUp
72 NO SCROLL Next/PgDown
73 BREAK End
74
75 Set-Up Guide:
76
77 http://vt100.net/docs/vt102-ug/chapter3.html#S3.6
78
79 Author:
80
81 Marc Lehmann <vt102\@schmorp.de>
82
83 EOF
84 }
85
86 #############################################################################
87 # ROM/hardware init
88
89 my $ROMS = do {
90 binmode DATA;
91 local $/;
92 <DATA>
93 };
94
95 0x6801 == length $ROMS or die "corrupted rom image";
96
97 binmode STDOUT;
98
99 my @M = (0xff) x 65536; # main memory, = (0xff) x 65536;
100
101 # populate mem with rom contents
102 if ($VT102) {
103 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x2000, 0x2000;
104 @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROMS, 0x4000, 0x2000;
105 @M[0xa000 .. 0xa7ff] = unpack "C*", substr $ROMS, 0x6000, 0x0800 if $VT131;
106 } else {
107 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x0000, 0x2000;
108 }
109
110 #############################################################################
111 # 8085 CPU registers and I/O support
112
113 my $PTY; # the pty we allocated, if any
114
115 # 8080/8085 registers
116 # b, c, d, e, h, l, a
117 my ($A, $B, $C, $D, $E, $H, $L, $A);
118 my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC);
119
120 my $RST = 0; # 8080 pending interrupts
121 my $INTMASK = 7; # 8085 half interrupts
122 my $INTPEND = 0; # 8085 half interrupts
123
124 my $x; # dummy temp for instructions
125
126 my $CLK; # rather inexact clock
127
128 #############################################################################
129 # the dreaded NVR1400 chip. not needed to get it going, but provided anyway
130
131 # nvram
132 my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
133 my $NVRADDR;
134 my $NVRDATA;
135 my $NVRLATCH;
136
137 my @NVRCMD = (
138 sub { $NVRDATA = ($NVRDATA << 1) + $_[1]; }, # 0 accept data
139 sub { $NVRADDR = ($NVRADDR << 1) + $_[1]; }, # 1 accept addr
140 sub { ($NVRDATA <<= 1) & 0x4000 }, # 2 shift out
141 undef, # 3 not used, will barf
142 sub { $NVR[$_[0]] = $NVRDATA & 0x3fff; }, # 4 write
143 sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase
144 sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read
145 sub { }, # 7 standby
146 );
147
148 my @bitidx;
149 $bitidx[1 << $_] = 9 - $_ for 0..9;
150
151 # the nvr1400 state machine. what a monster
152 sub nvr() {
153 my $a1 = $bitidx[(~$NVRADDR ) & 0x3ff];
154 my $a0 = $bitidx[(~$NVRADDR >> 10) & 0x3ff];
155
156 # printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA;
157
158 $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
159 }
160
161 #############################################################################
162 # I/O ports - output
163
164 my $DC11_REVERSE = 0;
165
166 my $XON = 1; # false if terminal wants us to pause
167 my $PUSARTCMD;
168
169 my @KXMIT; # current scan queue
170 my %KXMIT; # currently pressed keys
171 my @KQUEUE; # key event queue
172 my $KXCNT; # count for debouncew
173 my @PUSARTRECV;
174 my $KSTATUS;
175
176 sub out_00 { # pusartdata
177 # handle xon/xoff, but also pass it through
178 if ($_[0] == 0x13) {
179 $XON = 0;
180 return;#d#
181 } elsif ($_[0] == 0x11) {
182 $XON = 1;
183 return;#d#
184 }
185
186 syswrite $PTY, chr $_[0];
187
188 $INTPEND |= 1;
189 }
190
191 sub out_01 {
192 $PUSARTCMD = shift;
193
194 $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy
195 $INTPEND |= 2 if $PUSARTCMD & 0x04 && !@PUSARTRECV; # VT102, 6.5 rxrdy, needed for some reason
196 }
197
198 sub out_02 { } # baudrate generator
199
200 sub out_23 { } # unknown
201 sub out_27 { } # unknown
202 sub out_2f { } # unknown, connected to in 0f
203
204 sub out_42 { } # brightness
205
206 sub out_62 {
207 $NVRLATCH = shift;
208 }
209
210 sub out_a2 {
211 my $dc11 = 0x0f & shift;
212
213 $DC11_REVERSE = 1 if $dc11 == 0b1010;
214 $DC11_REVERSE = 0 if $dc11 == 0b1011;
215 }
216
217 sub out_c2 { } # unknown
218 sub out_d2 { } # 0..3 == 80c/132c/60hz/50hz
219
220 sub out_82 {
221 # keyboard
222
223 # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INS L1
224 # CLICK STARTSCAN ONLINE LOCKED | L1 L2 L3 L4
225 $KSTATUS = $_[0];
226
227 # start new scan unless scan in progress
228 if (($_[0] & 0x40) && !@KXMIT) {
229 # do not reply with keys in locked mode
230 # or during post (0xff),
231 # mostly to skip init and not fail POST,
232 # and to send startup keys only when terminal is ready
233 unless (($_[0] & 0x10) || ($_[0] == 0xff) || ($VT102 && $INTMASK == 0x07)) {
234 if ($KXCNT <= 0 && @KQUEUE) {
235 my $c = shift @KQUEUE;
236
237 if ($c < 0) { # key up
238 delete $KXMIT{-$c};
239 $KXCNT = 10;
240 } elsif ($c > 0) { # key down
241 undef $KXMIT{$c};
242 $KXCNT = 10;
243 } else { # delay
244 $KXCNT = 100;
245 }
246 }
247
248 --$KXCNT;
249 @KXMIT = sort keys %KXMIT;
250 }
251
252 $RST |= 1;
253 }
254 }
255
256 #############################################################################
257 # I/O ports - input
258
259 my $NVRBIT;
260 my $LBA6; # twice the frequenxy of LBA7
261
262 sub in_00 { # pusart data
263 # interrupt not generated here, because infinite
264 # speed does not go well with the vt102.
265
266 shift @PUSARTRECV
267 }
268
269 sub in_01 { # pusart status
270 # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY
271 0x85 + (@PUSARTRECV && 0x02)
272 }
273
274 sub in_22 { # modem buffer(?)
275 # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
276 0x20
277 }
278
279 sub in_0f { 0xff } # vt102 unknown, connected to out 2f
280
281 sub in_42 { # flag buffer
282 ++$LBA6;
283
284 $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA6 & 0x3) == 0x2;
285
286 # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
287
288 my $f = 0x85 | $NVRBIT;
289
290 $f |= 0x02 unless $AVO;
291 $f |= 0x40 if $LBA6 & 0x2;
292
293 $f
294 }
295
296 sub in_82 { # tbmt keyboard uart
297 return 0x7f unless @KXMIT;
298
299 $RST |= 1;
300 shift @KXMIT
301 }
302
303 sub in_03 { 0xff } # vt102 unknown, printer uart input?
304 sub in_0b { 0xff } # vt102 unknown
305 sub in_17 { 0xff } # vt102 unknown, printer status clear by reading?
306 sub in_1b { 0xff } # vt102 unknown
307
308 #############################################################################
309 # 8085 cpu opcodes and flag handling
310
311 sub sf { # set flags (ZSC - AP not implemented)
312 $FS = $_[0] & 0x080;
313 $FZ = !($_[0] & 0x0ff);
314 $FC = $_[0] & 0x100;
315
316 $_[0] &= 0xff;
317 }
318
319 sub sf8 { # set flags (ZSC - AP not implemented)
320 $FS = $_[0] & 0x080;
321 $FZ = !($_[0] & 0x0ff);
322 $FC = 0;
323 }
324
325 sub sf_nc { # set flags except carry
326 $FS = $_[0] & 0x080;
327 $FZ = ($_[0] & 0x0ff) == 0;
328
329 $_[0] &= 0xff;
330 }
331
332 my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0x00 .. 0xff;
333
334 my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A);
335 my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity
336
337 $op[0x00] = '';
338
339 # mov r,r / r,M / M,r
340 for my $s (0..7) {
341 for my $d (0..7) {
342 $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]"; # mov
343 }
344 }
345
346 $op[0x76] = 'die "HLT"'; # hlt (mov m,m)
347
348 # mvi r / M
349 $op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
350
351 $op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
352 $op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
353 $op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
354 $op[0x31] = '$SP = IMM16' ; # lxi
355
356 $op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
357 $op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
358 $op[0x32] = '$M[IMM16 ] = $A'; # sta
359
360 $op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b
361 $op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d
362 $op[0x3a] = '$A = $M[IMM16]'; # lda
363
364 $op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld
365 $op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld
366
367 sub inxdcx($$$) {
368 $x = $_[0] * 256 + $_[1] + $_[2];
369 ($_[0], $_[1]) = (($x >> 8) & 0xff, $x & 0xff);
370 }
371
372 $op[0x03] = 'inxdcx $B, $C, 1'; # inx
373 $op[0x13] = 'inxdcx $D, $E, 1'; # inx
374 $op[0x23] = 'inxdcx $H, $L, 1'; # inx
375 $op[0x33] = '$SP++' ; # inx
376 $op[0x0b] = 'inxdcx $B, $C, -1'; # dcx
377 $op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
378 $op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
379 $op[0x3b] = '--$SP' ; # dcx
380
381 # "no carry" doesn't seem to be needed for vt100 - optimize?
382 $op[0x04 + $_ * 8] = "sf_nc ++$reg[$_]" for 0..7; # inr
383 $op[0x05 + $_ * 8] = "sf_nc --$reg[$_]" for 0..7; # dcr
384
385 $op[0x07] = ' $FC = $A & 0x80; $A = (($A << 1) + ($FC && 0x01)) & 0xff '; # rlc
386 $op[0x17] = ' ($FC, $A) = ($A & 0x80, (($A << 1) + ($FC && 0x01)) & 0xff)'; # ral
387
388 $op[0x0f] = ' $FC = $A & 0x01; $A = ($A >> 1) | ($FC && 0x80) '; # rrc
389 $op[0x1f] = ' ($FC, $A) = ($A & 0x01, ($A >> 1) | ($FC && 0x80))'; # rar
390
391 $op[0x2f] = '$A ^= 0xff'; # cma
392
393 # getting this insn wrong (its the only 16 bit insn to modify flags)
394 # wasted three of my best days with mindless vt102 rom reverse engineering
395 sub dad {
396 $x = $H * 256 + $L + $_[0];
397
398 ($H, $L) = (($x >> 8) & 0xff, $x & 0xff);
399 $FC = $x > 0xffff;
400 }
401
402 $op[0x09] = 'dad $B * 256 + $C'; # dad
403 $op[0x19] = 'dad $D * 256 + $E'; # dad
404 $op[0x29] = 'dad $H * 256 + $L'; # dad
405 $op[0x39] = 'dad $SP '; # dad
406
407 $op[0x80 + $_] = 'sf $A += + ' . $reg[$_] for 0..7; # add
408 $op[0x88 + $_] = 'sf $A += ($FC && 1) + ' . $reg[$_] for 0..7; # adc
409 $op[0x90 + $_] = 'sf $A -= + ' . $reg[$_] for 0..7; # sub
410 $op[0x98 + $_] = 'sf $A -= ($FC && 1) + ' . $reg[$_] for 0..7; # sbb
411 $op[0xa0 + $_] = 'sf8 $A &= ' . $reg[$_] for 0..7; # ana
412 $op[0xa8 + $_] = 'sf8 $A ^= ' . $reg[$_] for 0..7; # xra
413 $op[0xb0 + $_] = 'sf8 $A |= ' . $reg[$_] for 0..7; # ora
414 $op[0xb8 + $_] = 'sf $x = $A - ' . $reg[$_] for 0..7; # cmp
415 # possible todo: optimize ora a, maybe xra a
416
417 $op[0xc6] = 'sf $A += IMM8'; # adi
418 # ce ADI NYI
419 $op[0xd6] = 'sf $A -= IMM8'; # sui
420 # de SBI NYI
421 $op[0xe6] = 'sf8 $A &= IMM8'; # ani
422 $op[0xee] = 'sf8 $A ^= IMM8'; # xri
423 $op[0xf6] = 'sf8 $A |= IMM8'; # ori
424 $op[0xfe] = 'sf $A - IMM8'; # cpi
425
426 $op[0xc5] = 'PUSH $B; PUSH $C';
427 $op[0xd5] = 'PUSH $D; PUSH $E';
428 $op[0xe5] = 'PUSH $H; PUSH $L';
429 $op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
430
431 $op[0xc1] = '($C, $B) = (POP, POP)'; # pop
432 $op[0xd1] = '($E, $D) = (POP, POP)'; # pop
433 $op[0xe1] = '($L, $H) = (POP, POP)'; # pop
434 $op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = ($x & 0x80, $x & 0x40, $x & 0x10, $x & 0x04, $x & 0x01)'; # pop psw
435
436 $op[0xc2 + $_ * 8] = 'BRA IMM16 ' . $cc[$_] for 0..7; # jcc
437 $op[0xc3] = 'JMP IMM16'; # jmp
438
439 $op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) ' . $cc[$_] for 0..7; # ccc
440 $op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
441
442 $op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 ' . $cc[$_] for 0..7; # rcc
443 $op[0xc9] = 'JMP POP + POP * 256'; # ret
444
445 $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
446
447 $op[0xe9] = 'JMP $H * 256 + $L'; # pchl
448 # f9 SPHL NYI
449
450 $op[0x37] = '$FC = 1 '; # stc
451 $op[0x3f] = '$FC = !$FC'; # cmc
452
453 $op[0xd3] = 'OUT'; # out
454 $op[0xdb] = 'IN'; # in
455
456 $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
457
458 # e3 xthl NYI # @ 917b, hl <-> (sp)
459
460 $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete)
461 $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete)
462
463 $op[0xf3] = '$IFF = 0'; # DI
464 $op[0xfb] = '$IFF = 1'; # EI
465
466 # yeah, the fucking setup screens actually use daa...
467 $op[0x27] = '
468 my ($h, $l);
469
470 ($h, $l) = ($A >> 4, $A & 15);
471
472 if ($l > 9 || $FA) {
473 sf $A += 6;
474 ($h, $l) = ($A >> 4, $A & 15);
475 }
476
477 if ($h > 9 || $FC) {
478 $h += 6;
479 $A = ($h * 16 + $l) & 0xff;
480 }
481 '; # daa, almost certainly borked, also, acarry not set by sf
482
483 #############################################################################
484 # print cpu status for debugging purposes
485
486 # print cpu status, for debugging
487 sub status {
488 my $PC = shift || $PC;
489
490 printf "%04x/%04x A=%02x BC=%02x:%02x DE=%02x:%02x HL=%02x:%02x ZSCAP=%s: %02x %s\n",
491 $PC, $SP,
492 $A, $B, $C, $D, $E, $H, $L,
493 ($FZ ? "1" : "0")
494 . ($FS ? "1" : "0")
495 . ($FC ? "1" : "0")
496 . ($FA ? "1" : "0")
497 . ($FP ? "1" : "0"),
498 $M[$PC], $op[$M[$PC]];
499 }
500
501 #############################################################################
502 # video emulation
503
504 my @CHARMAP = (
505 " " , "\x{29eb}", "\x{2592}", "\x{2409}",
506 "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}",
507 "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}",
508 "\x{2510}", "\x{250c}", "\x{2514}", "\x{253c}",
509 "\x{23ba}", "\x{23bb}", "\x{2500}", "\x{23bc}",
510 "\x{23bd}", "\x{251c}", "\x{2524}", "\x{2534}",
511 "\x{252c}", "\x{2502}", "\x{2264}", "\x{2265}",
512 "\x{03c0}", "\x{2260}", "\x{00a3}", "\x{00b7}",
513 (map chr, 0x020 .. 0x7e),
514 );
515
516 utf8::encode $_ for @CHARMAP;
517
518 my @SGR; # sgr sequences for attributes
519
520 for (0x00 .. 0xff) {
521 my $sgr = "";
522
523 # ~1 sgr 5 blink
524 # ~2 sgr 4 underline
525 # ~4 sgr 1 bold
526 # 0x80 in attr, sgr 7, reversed
527
528 $sgr .= ";5" unless $_ & 0x01;
529 $sgr .= ";4" unless $_ & 0x02;
530 $sgr .= ";1" unless $_ & 0x04;
531 $sgr .= ";7" if $_ & 0x80;
532
533 $SGR[$_] = "\e[${sgr}m";
534 }
535
536 my @LED = $VT102
537 ? qw(L1 INSERT DSR CTS LOCKED LOCAL SCAN BEEP)
538 : qw(L4 L3 L2 L1 LOCKED LOCAL SCAN BEEP);
539
540 # display screen
541 sub display {
542 my $i = 0x2000;
543
544 my $leds = join " ", map $KSTATUS & 2**$_ ? "\e[7m$LED[$_]\e[m" : "$LED[$_]", reverse 0 .. $#LED;
545
546 my $scr = sprintf "\e[H--- LED [ %s ] CLK %d\e[K\n", $leds, $CLK;
547
548 $scr .= "\e[?5" . ($DC11_REVERSE ? "h" : "l");
549
550 line:
551 for my $y (0 .. 25) { # ntsc, two vblank delay lines, up to 24 text lines
552 my $prev_sgr;
553
554 $scr .= sprintf "%2d \xe2\x94\x82", $y;
555
556 for (0..139) {
557 my $c = $M[$i];
558
559 if ($c == 0x7f) { # also 0xff, but the firmware avoids that
560 $scr .= "\e[m\xe2\x94\x82\e[K\n";
561
562 my $a1 = $M[$i + 1];
563 my $a0 = $M[$i + 2];
564
565 $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
566
567 next line;
568 }
569
570 my $sgr = $SGR[ ($M[$i++ + 0x1000] & 15) | ($c & 0x80)];
571
572 $scr .= $prev_sgr = $sgr if $sgr ne $prev_sgr;
573
574 $scr .= $CHARMAP[$c & 0x7f];
575 }
576
577 $scr .= "\e[K\nvideo overflow\e[K\n";
578 last;
579 }
580
581 $scr .= "\e[m\e[J";
582
583 syswrite STDOUT, $scr;
584 }
585
586 #############################################################################
587 # keyboard handling
588
589 # 0x080 shift, 0x100 ctrl
590 my %KEYMAP = (
591 "\t" => 0x3a,
592 "\r" => 0x64,
593 "\n" => 0x44,
594
595 "\x00" => 0x77 | 0x100, # CTRL-SPACE
596 "\x1c" => 0x45 | 0x100, # CTRL-\
597 "\x1d" => 0x14 | 0x100, # CTRL-]
598 "\x1e" => 0x24 | 0x100, # CTRL-~
599 "\x1f" => 0x75 | 0x100, # CTRL-?
600
601 # hardcoded rxvt keys
602 "\e" => 0x2a, # ESC
603 "\e[3~" => 0x03, # DC
604 "\e[5~" => 0x7e, # CAPS LOCK (prior)
605 "\e[6~" => 0x6a, # NO SCROLL (next)
606 "\e[A" => 0x30, # UP
607 "\e[B" => 0x22, # DOWN
608 "\e[C" => 0x10, # RIGHT
609 "\e[D" => 0x20, # LEFT
610 "\e[a" => 0x30 | 0x080, # UP
611 "\e[b" => 0x22 | 0x080, # DOWN
612 "\e[c" => 0x10 | 0x080, # RIGHT
613 "\e[d" => 0x20 | 0x080, # LEFT
614 "\e[7~" => 0x7b, # SETUP (home)
615 "\e[8~" => 0x23, # BREAK (end)
616 "\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end)
617 "\x7f" => 0x33, # BACKSPACE
618
619 "\e[11~" => 0x32, # F1
620 "\e[11~" => 0x42, # F2
621 "\e[11~" => 0x31, # F3
622 "\e[11~" => 0x41, # F4
623 );
624
625 @KEYMAP{map chr, 0x20 .. 0x40, 0x5b .. 0x7e} = unpack "C*", pack "H*",
626 "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9" # 20..40
627 . "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4"; # 5b..7e
628
629 $KEYMAP{"\x1f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
630 $KEYMAP{"\x20" ^ $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
631
632 my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
633 $KEYMATCH = qr{^($KEYMATCH)}s;
634
635 my %KMOD;
636
637 sub key {
638 my ($key) = @_;
639
640 push @KQUEUE, -0x7c if !($key & 0x100) && delete $KMOD{0x7c}; # ctrl-up
641 push @KQUEUE, -0x7d if !($key & 0x080) && delete $KMOD{0x7d}; # shift-up
642
643 push @KQUEUE, 0x7c if $key & 0x100 && !$KMOD{0x7c}++; # ctrl-down
644 push @KQUEUE, 0x7d if $key & 0x080 && !$KMOD{0x7d}++; # shift-down
645
646 $key &= 0x7f;
647 push @KQUEUE, $key, -$key;
648 }
649
650 my $STDIN_BUF;
651
652 sub stdin_parse {
653 key $KEYMAP{$1}
654 while $STDIN_BUF =~ s/$KEYMATCH//;
655
656 # skip input we can't decipher
657 substr $STDIN_BUF, 0, 1, "";
658 }
659
660 if ($KBD) {
661 system "stty -icanon -icrnl -inlcr -echo min 1 time 0";
662 eval q{ sub END { system "stty sane" } };
663 $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 };
664 }
665
666 #############################################################################
667 # initial key input, to set up online mode etc.
668 # could be done via nvram defaults
669
670 @KQUEUE = (
671 0x7b, -0x7b, # setup
672 0, # delay
673 0x28, -0x28, # 4, toggle local/online
674 0x38, -0x38, # 5, setup b
675 0, # delay
676 (0x10, -0x10) x 2, # cursor right
677 0x37, -0x37, # 6 toggle soft scroll
678 (0x10, -0x10) x 1, # cursor right
679 0x37, -0x37, # 6 toggle autorepeat off
680 (0x10, -0x10) x 8, # cursor right
681 0x37, -0x37, # 6 toggle keyclick
682 (0x10, -0x10) x 1, # cursor right
683 $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
684 (0x10, -0x10) x 7, # cursor right
685 0x37, -0x37, # 6 toggle wrap around
686 0x7b, -0x7b, # leave setup
687 );
688
689 #############################################################################
690 # process/pty management
691
692 require IO::Pty;
693 $PTY = IO::Pty->new;
694
695 my $slave = $PTY->slave;
696
697 $PTY->set_winsize (24, 80);
698
699 unless (fork) {
700 $ENV{TERM} = $VT102 ? "vt102" : "vt100";
701
702 close $PTY;
703
704 open STDIN , "<&", $slave;
705 open STDOUT, ">&", $slave;
706 open STDERR, ">&", $slave;
707
708 system "stty ixoff erase ^H";
709
710 $PTY->make_slave_controlling_terminal;
711 $PTY->close_slave;
712
713 @ARGV = "sh" unless @ARGV;
714 exec @ARGV;
715 }
716
717 $PTY->close_slave;
718
719 #############################################################################
720 # the actual hardware simulator
721
722 my @ICACHE; # compiled instruction cache
723
724 while () {
725 # execute extended basic blocks
726 $PC = ($ICACHE[$PC] ||= do {
727 my $pc = $PC;
728
729 my $insn = "";
730
731 # the jit compiler
732 for (0..31) {
733 my $imm;
734 my $op = $op[$M[$pc++]];
735
736 for ($op) {
737 s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
738 s/\bPOP\b/\$M[\$SP++]/g; # pop byte from stack
739
740 s/\bIMM16\b/$imm \/\/= $M[$pc++] + $M[$pc++] * 256/xge; # 16 bit insn immediate
741 s/\bIMM8\b /$imm \/\/= $M[$pc++] /xge; # 8 bit insn immediate
742
743 s/\bPC\b/$pc/ge; # PC at end of insn
744 s/\bBRA\b/return/g; # conditional jump
745 s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump
746
747 s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge;
748 s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge;
749 }
750
751 $insn .= "$op;\n";
752 }
753
754
755 $insn .= $pc;
756 $insn =~ s/\x00.*$//s;
757
758 eval "use integer; sub { $insn }" or die "$insn: $@"
759 })->();
760
761 ++$CLK;
762
763 # things we do from time too time only
764 unless ($CLK & 0xf) {
765 # do I/O
766
767 unless ($CLK & 0xfff) {
768
769 # pty/serial I/O
770 unless ((@PUSARTRECV >= 128) || @KQUEUE || !$PTY) {
771 my $rin = ""; (vec $rin, fileno $PTY, 1) = 1;
772
773 if (select $rin, undef, undef, 0) {
774 sysread $PTY, my $buf, 256;
775 push @PUSARTRECV, unpack "C*", $buf;
776 }
777 }
778
779 # keyboard input
780 if ($KBD) {
781 while (select my $rin = "\x01", undef, undef, 0) {
782 sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF
783 or last;
784 }
785
786 stdin_parse if length $STDIN_BUF;
787 }
788 }
789
790 # kick off various interrupts
791
792 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though)
793 #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy
794
795 # kick off vertical retrace form time to time
796 unless ($CLK & 0x1ff) {
797 $RST |= 4; # vertical retrace
798 }
799
800 # handle video hardware
801 unless ($CLK & 0x3fff) {
802 display;
803 }
804 }
805
806 # the interrupt logic
807 if (($RST || ($INTPEND & ~$INTMASK)) && $IFF) {
808 # rst 1 kbd data available
809 # rst 2 pusart xmit+recv flag
810 # rst 4 vertical retrace
811 # 5.5 vt125 mb7 trans ready (serial send?)
812 # 6.5 vt125 mb7 read ready (something modem?)
813 # 7.5 vt125 mb7 vblank h(?)
814 # trap vt125 mbi init h(?)
815 my $vec;
816
817 $x = $INTPEND & ~$INTMASK;
818
819 if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1;
820 } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2;
821 } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4;
822 # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # the vt102 firmware doesn't like combined interrupts
823 } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
824 } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
825 } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
826 } else {
827 die;
828 }
829
830 $M[--$SP] = $PC >> 8;
831 $M[--$SP] = $PC & 0xff;
832 $PC = $vec;
833
834 $IFF = 0;
835 }
836 }
837
838 #############################################################################
839 # roms in the data section + one newline
840 #
841 # vt100 @ 0x0000+0x0800 23-032E2
842 # vt100 @ 0x0800+0x0800 23-061E2
843 # vt100 @ 0x1000+0x0800 23-033E2
844 # vt100 @ 0x1800+0x0800 23-034E2
845 #
846 # vt102 @ 0x0000+0x2000 23-226E4
847 # vt102 @ 0x8000+0x2000 23-225E4
848 #
849 # vt131 @ 0xa000+0x0800 23-280E2
850 #
851
852 __DATA__
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