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Revision: 1.23
Committed: Wed Dec 3 11:09:51 2014 UTC (9 years, 5 months ago) by root
Branch: MAIN
Changes since 1.22: +72 -75 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 # vt100 wps = word processing roms
33 # vt101 = vt102 - avo, but custom rom? really?
34 # vt103 = vt100 + tu58 tape drive
35 # vt125 = vt100 + gpo graphics processor
36 # vt132 = vt100 + avo, stp
37 # vt180 = vt100 + z80 cp/m
38
39 if ($ARGV[0] =~ /^-/) {
40 die <<EOF;
41
42 VT102, A VT100/102/131 SIMULATOR
43
44 Usage:
45
46 $0 [option] [program [args]]
47
48 Examples:
49
50 $0 bash
51 $0 telnet towel.blinkenlights.nl
52 $0 curl http://artscene.textfiles.com/vt100/trekvid.vt
53 $0 curl http://artscene.textfiles.com/vt100/surf.vt # in 3d!
54
55 Option can be one of:
56
57 --vt100
58 --vt100+avo
59 --vt102
60 --vt131
61
62 Non-obvious special keys are:
63
64 SET UP Home
65 BACKSPACE Rubout
66 CAPS LOCK Prior/PgUp
67 NO SCROLL Next/PgDown
68 BREAK End
69
70 Set-Up Guide:
71
72 http://vt100.net/docs/vt102-ug/chapter3.html#S3.6
73
74 Author:
75
76 Marc Lehmann <vt102\@schmorp.de>
77
78 EOF
79 }
80
81 #############################################################################
82 # ROM/hardware init
83
84 my $PTY; # the pty we allocated, if any
85 my $KBD = 1;
86
87 my $ROMS = do {
88 binmode DATA;
89 local $/;
90 <DATA>
91 };
92
93 0x6801 == length $ROMS or die "corrupted rom image";
94
95 my @M = (0xff) x 65536; # main memory, = (0xff) x 65536;
96
97 # populate mem with rom contents
98 if ($VT102) {
99 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x2000, 0x2000;
100 @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROMS, 0x4000, 0x2000;
101 @M[0xa000 .. 0xa7ff] = unpack "C*", substr $ROMS, 0x6000, 0x0800 if $VT131;
102 } else {
103 @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROMS, 0x0000, 0x2000;
104 }
105
106 #############################################################################
107 # 8085 CPU registers and I/O support
108
109 # 8080/8085 registers
110 my ($A, $B, $C, $D, $E, $H, $L); # 8 bit general purpose
111 my ($PC, $SP, $IFF); # program counter, stack pointer, interrupt flag
112 my ($FA, $FZ, $FS, $FP, $FC); # condition codes (psw)
113
114 my $RST = 0; # pending interrupts (8259 interrupt controller)
115 my $INTMASK = 7; # 8085 half interrupt mask
116 my $INTPEND = 0; # 8085 half interrupts pending
117
118 my $CLK; # rather inexact clock, counts extended basic blocks
119
120 #############################################################################
121 # the dreaded NVR1400 chip. not needed to get it going, but provided anyway
122
123 # nvram
124 my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
125 my $NVRADDR;
126 my $NVRDATA;
127 my $NVRLATCH;
128
129 my @NVRCMD = (
130 sub { $NVRDATA = ($NVRDATA << 1) + $_[1]; }, # 0 accept data
131 sub { $NVRADDR = ($NVRADDR << 1) + $_[1]; }, # 1 accept addr
132 sub { ($NVRDATA <<= 1) & 0x4000 }, # 2 shift out
133 undef, # 3 not used, will barf
134 sub { $NVR[$_[0]] = $NVRDATA & 0x3fff; }, # 4 write
135 sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase
136 sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read
137 sub { }, # 7 standby
138 );
139
140 my @NVR_BITIDX; $NVR_BITIDX[1 << $_] = 9 - $_ for 0..9;
141
142 # the nvr1400 state machine. what a monster
143 sub nvr() {
144 my $a1 = $NVR_BITIDX[(~$NVRADDR ) & 0x3ff];
145 my $a0 = $NVR_BITIDX[(~$NVRADDR >> 10) & 0x3ff];
146
147 $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
148 }
149
150 #############################################################################
151 # I/O ports - output
152
153 my $DC11_REVERSE = 0; # light background?
154
155 my $XON = 1; # false if terminal wants us to pause
156 my $PUSARTCMD;
157
158 my $KSTATUS; # keyboard status (click + scan flag + leds)
159 my @KXMIT; # current scan queue
160 my %KXMIT; # currently pressed keys
161 my @KQUEUE; # key event queue
162 my $KXCNT; # count for debouncew
163
164 my @PUSARTRECV; # serial input (to terminal) queue
165
166 sub out_00 { # pusartdata
167 # handle xon/xoff, but also pass it through
168 if ($_[0] == 0x13) {
169 $XON = 0;
170 return;#d#
171 } elsif ($_[0] == 0x11) {
172 $XON = 1;
173 return;#d#
174 }
175
176 syswrite $PTY, chr $_[0];
177
178 $INTPEND |= 1;
179 }
180
181 sub out_01 { # pusartcmd
182 $PUSARTCMD = shift;
183
184 $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy
185 $INTPEND |= 2 if $PUSARTCMD & 0x04 && !@PUSARTRECV; # VT102, 6.5 rxrdy, needed for some reason
186 }
187
188 sub out_02 { } # baudrate generator
189
190 sub out_23 { } # vt102 unknown
191 sub out_27 { } # vt102 unknown
192 sub out_2f { } # vt102 unknown, connected to in 0f
193
194 sub out_42 { } # brightness
195
196 sub out_62 { # nvr latch register (4 bits)
197 $NVRLATCH = shift;
198 }
199
200 sub out_a2 { # device control 011
201 my $dc11 = 0x0f & shift;
202
203 $DC11_REVERSE = 1 if $dc11 == 0b1010;
204 $DC11_REVERSE = 0 if $dc11 == 0b1011;
205 }
206
207 sub out_c2 { } # unknown
208 sub out_d2 { } # device control 012, 0..3 == 80c/132c/60hz/50hz
209
210 sub out_82 { # keyboard txmit
211 # CLICK STARTSCAN ONLINE LOCKED | L1 L2 L3 L4 (vt100)
212 # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INS L1 (vt102)
213 $KSTATUS = $_[0];
214
215 # start new scan unless scan is in progress
216 if (($_[0] & 0x40) && !@KXMIT) {
217 # do not reply with keys in locked mode
218 # or during post (0xff),
219 # mostly to skip init and not fail POST,
220 # and to send startup keys only when terminal is ready
221 unless (($_[0] & 0x10) || ($_[0] == 0xff) || ($VT102 && $INTMASK == 0x07)) {
222 if ($KXCNT <= 0 && @KQUEUE) {
223 my $c = shift @KQUEUE;
224
225 if ($c < 0) { # key up
226 delete $KXMIT{-$c};
227 $KXCNT = 10;
228 } elsif ($c > 0) { # key down
229 undef $KXMIT{$c};
230 $KXCNT = 10;
231 } else { # delay
232 $KXCNT = 100;
233 }
234 }
235
236 --$KXCNT;
237 @KXMIT = sort keys %KXMIT;
238 }
239
240 $RST |= 1;
241 }
242 }
243
244 #############################################################################
245 # I/O ports - input
246
247 my $NVRBIT; # the current nvr data bit
248 my $LBA6; # twice the frequenxy of LBA7
249
250 sub in_00 { # pusart data
251 # interrupt not generated here, because infinite
252 # speed does not go well with the vt102.
253
254 shift @PUSARTRECV
255 }
256
257 sub in_01 { # pusart status
258 # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY
259 0x85 + (@PUSARTRECV && 0x02)
260 }
261
262 sub in_22 { # modem buffer
263 # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
264 0x20
265 }
266
267 sub in_0f { 0xff } # vt102 unknown, connected to out 2f
268
269 sub in_42 { # flag buffer
270 ++$LBA6;
271
272 $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA6 & 0x3) == 0x2;
273
274 # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
275
276 my $f = 0x85 | $NVRBIT;
277
278 $f |= 0x02 unless $AVO;
279 $f |= 0x40 if $LBA6 & 0x2;
280
281 $f
282 }
283
284 sub in_82 { # tbmt keyboard uart
285 return 0x7f unless @KXMIT;
286
287 $RST |= 1;
288 shift @KXMIT
289 }
290
291 sub in_03 { 0xff } # vt102 unknown, printer uart input?
292 sub in_0b { 0xff } # vt102 unknown
293 sub in_17 { 0xff } # vt102 unknown, printer status clear by reading?
294 sub in_1b { 0xff } # vt102 unknown
295
296 #############################################################################
297 # 8085 cpu opcodes and flag handling
298
299 my $x; # dummy scratchpad for opcodes
300
301 sub sf { # set flags, full version (ZSC - AP not implemented)
302 $FS = $_[0] & 0x080;
303 $FZ = !($_[0] & 0x0ff);
304 $FC = $_[0] & 0x100;
305
306 $_[0] &= 0xff;
307 }
308
309 sub sf8 { # set flags, for 8-bit results (ZSC - AP not implemented)
310 $FS = $_[0] & 0x080;
311 $FZ = !($_[0] & 0x0ff);
312 $FC = 0;
313 }
314
315 sub sf_nc { # set flags, except carry
316 $FS = $_[0] & 0x080;
317 $FZ = ($_[0] & 0x0ff) == 0;
318
319 $_[0] &= 0xff;
320 }
321
322 # opcode table
323 my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0x00 .. 0xff;
324
325 my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A); # r/m encoding
326 my @cc = ('!$FZ', '$FZ', '!$FC', '$FC', 'die;', 'die;', '!$FS', '$FS'); # cc encoding. die == unimplemented $FP parity
327
328 $op[0x00] = ''; # nop
329
330 # mov r,r / r,M / M,r
331 for my $s (0..7) {
332 for my $d (0..7) {
333 $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]"; # mov
334 }
335 }
336
337 $op[0x76] = 'die "HLT"'; # hlt (mov m,m)
338
339 # mvi r / M
340 $op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
341
342 $op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
343 $op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
344 $op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
345 $op[0x31] = '$SP = IMM16' ; # lxi
346
347 $op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
348 $op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
349 $op[0x32] = '$M[IMM16 ] = $A'; # sta
350
351 $op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b
352 $op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d
353 $op[0x3a] = '$A = $M[IMM16]'; # lda
354
355 $op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld
356 $op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld
357
358 sub inxdcx($$$) {
359 $x = $_[0] * 256 + $_[1] + $_[2];
360 ($_[0], $_[1]) = (($x >> 8) & 0xff, $x & 0xff);
361 }
362
363 $op[0x03] = 'inxdcx $B, $C, 1'; # inx
364 $op[0x13] = 'inxdcx $D, $E, 1'; # inx
365 $op[0x23] = 'inxdcx $H, $L, 1'; # inx
366 $op[0x33] = '$SP++' ; # inx
367 $op[0x0b] = 'inxdcx $B, $C, -1'; # dcx
368 $op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
369 $op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
370 $op[0x3b] = '--$SP' ; # dcx
371
372 # "no carry" doesn't seem to be needed for vt100 - optimize?
373 $op[0x04 + $_ * 8] = "sf_nc ++$reg[$_]" for 0..7; # inr
374 $op[0x05 + $_ * 8] = "sf_nc --$reg[$_]" for 0..7; # dcr
375
376 $op[0x07] = ' $FC = $A & 0x80; $A = (($A << 1) + ($FC && 0x01)) & 0xff '; # rlc
377 $op[0x17] = ' ($FC, $A) = ($A & 0x80, (($A << 1) + ($FC && 0x01)) & 0xff)'; # ral
378 $op[0x0f] = ' $FC = $A & 0x01; $A = ($A >> 1) | ($FC && 0x80) '; # rrc
379 $op[0x1f] = ' ($FC, $A) = ($A & 0x01, ($A >> 1) | ($FC && 0x80))'; # rar
380
381 # getting this insn wrong (its the only 16 bit insn to modify flags)
382 # wasted three of my best days with mindless vt102 rom reverse engineering
383 sub dad {
384 $x = $H * 256 + $L + $_[0];
385
386 ($H, $L) = (($x >> 8) & 0xff, $x & 0xff);
387 $FC = $x > 0xffff;
388 }
389
390 $op[0x09] = 'dad $B * 256 + $C'; # dad
391 $op[0x19] = 'dad $D * 256 + $E'; # dad
392 $op[0x29] = 'dad $H * 256 + $L'; # dad
393 $op[0x39] = 'dad $SP '; # dad
394
395 $op[0x2f] = '$A ^= 0xff'; # cma
396
397 $op[0x80 + $_] = 'sf $A += + ' . $reg[$_] for 0..7; # add
398 $op[0x88 + $_] = 'sf $A += ($FC && 1) + ' . $reg[$_] for 0..7; # adc
399 $op[0x90 + $_] = 'sf $A -= + ' . $reg[$_] for 0..7; # sub
400 $op[0x98 + $_] = 'sf $A -= ($FC && 1) + ' . $reg[$_] for 0..7; # sbb
401 $op[0xa0 + $_] = 'sf8 $A &= ' . $reg[$_] for 0..7; # ana
402 $op[0xa8 + $_] = 'sf8 $A ^= ' . $reg[$_] for 0..7; # xra
403 $op[0xb0 + $_] = 'sf8 $A |= ' . $reg[$_] for 0..7; # ora
404 $op[0xb8 + $_] = 'sf $x = $A - ' . $reg[$_] for 0..7; # cmp
405 # possible todo: optimize ora a, maybe xra a, possibly ana
406
407 $op[0xc6] = 'sf $A += IMM8'; # adi
408 $op[0xd6] = 'sf $A -= IMM8'; # sui
409 $op[0xe6] = 'sf8 $A &= IMM8'; # ani
410 $op[0xee] = 'sf8 $A ^= IMM8'; # xri
411 $op[0xf6] = 'sf8 $A |= IMM8'; # ori
412 $op[0xfe] = 'sf $A - IMM8'; # cpi
413 # ce ACI NYI, apparently unused
414 # de SBI NYI, apparently unused
415
416 $op[0xc5] = 'PUSH $B; PUSH $C';
417 $op[0xd5] = 'PUSH $D; PUSH $E';
418 $op[0xe5] = 'PUSH $H; PUSH $L';
419 $op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
420
421 $op[0xc1] = '($C, $B) = (POP, POP)'; # pop
422 $op[0xd1] = '($E, $D) = (POP, POP)'; # pop
423 $op[0xe1] = '($L, $H) = (POP, POP)'; # pop
424 $op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = ($x & 0x80, $x & 0x40, $x & 0x10, $x & 0x04, $x & 0x01)'; # pop psw
425
426 $op[0xc2 + $_ * 8] = 'BRA IMM16 if ' . $cc[$_] for 0..7; # jcc
427 $op[0xc3] = 'JMP IMM16'; # jmp
428
429 $op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) if ' . $cc[$_] for 0..7; # ccc
430 $op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
431
432 $op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 if ' . $cc[$_] for 0..7; # rcc
433 $op[0xc9] = 'JMP POP + POP * 256'; # ret
434
435 $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
436
437 $op[0xe9] = 'JMP $H * 256 + $L'; # pchl
438 # f9 SPHL NYI, apparently unused
439
440 $op[0x37] = '$FC = 1 '; # stc
441 $op[0x3f] = '$FC = !$FC'; # cmc
442
443 $op[0xd3] = 'OUT'; # out
444 $op[0xdb] = 'IN'; # in
445
446 $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
447
448 # e3 xthl NYI # @ 917b in e69, hl <-> (sp)
449
450 $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (8085, incomplete)
451 $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (8085, incomplete)
452
453 $op[0xf3] = '$IFF = 0'; # di
454 $op[0xfb] = '$IFF = 1'; # ei
455
456 # yeah, the fucking setup screen actually uses daa...
457 $op[0x27] = '
458 my ($h, $l);
459
460 ($h, $l) = ($A >> 4, $A & 15);
461
462 if ($l > 9 || $FA) {
463 sf $A += 6;
464 ($h, $l) = ($A >> 4, $A & 15);
465 }
466
467 if ($h > 9 || $FC) {
468 $h += 6;
469 $A = ($h * 16 + $l) & 0xff;
470 }
471 '; # daa, almost certainly borked, also, acarry not set by sf
472
473 #############################################################################
474 # debug
475
476 # print cpu status, for debugging
477 sub status {
478 my $PC = shift || $PC;
479
480 printf "%04x/%04x A=%02x BC=%02x:%02x DE=%02x:%02x HL=%02x:%02x ZSCAP=%s: %02x %s\n",
481 $PC, $SP,
482 $A, $B, $C, $D, $E, $H, $L,
483 ($FZ ? "1" : "0")
484 . ($FS ? "1" : "0")
485 . ($FC ? "1" : "0")
486 . ($FA ? "1" : "0")
487 . ($FP ? "1" : "0"),
488 $M[$PC], $op[$M[$PC]];
489 }
490
491 #############################################################################
492 # video emulation
493
494 binmode STDOUT;
495
496 my @CHARMAP = ( # acschars / chars 0..31
497 " " , "\x{29eb}", "\x{2592}", "\x{2409}",
498 "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}",
499 "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}",
500 "\x{2510}", "\x{250c}", "\x{2514}", "\x{253c}",
501 "\x{23ba}", "\x{23bb}", "\x{2500}", "\x{23bc}",
502 "\x{23bd}", "\x{251c}", "\x{2524}", "\x{2534}",
503 "\x{252c}", "\x{2502}", "\x{2264}", "\x{2265}",
504 "\x{03c0}", "\x{2260}", "\x{00a3}", "\x{00b7}",
505 (map chr, 0x020 .. 0x7e),
506 );
507
508 utf8::encode $_ for @CHARMAP;
509
510 my @SGR; # sgr sequences for attributes
511
512 for (0x00 .. 0xff) {
513 my $sgr = "";
514
515 # ~1 sgr 5 blink
516 # ~2 sgr 4 underline
517 # ~4 sgr 1 bold
518 # 0x80 in attr, sgr 7, reversed
519
520 $sgr .= ";5" unless $_ & 0x01;
521 $sgr .= ";4" unless $_ & 0x02;
522 $sgr .= ";1" unless $_ & 0x04;
523 $sgr .= ";7" if $_ & 0x80;
524
525 $SGR[$_] = "\e[${sgr}m";
526 }
527
528 my @LED = $VT102
529 ? qw(L1 INSERT DSR CTS LOCKED LOCAL SCAN BEEP)
530 : qw(L4 L3 L2 L1 LOCKED LOCAL SCAN BEEP);
531
532 # display screen
533 sub display {
534 my $i = 0x2000;
535
536 my $leds = join " ", map $KSTATUS & 2**$_ ? "\e[7m$LED[$_]\e[m" : "$LED[$_]", reverse 0 .. $#LED;
537
538 my $scr = sprintf "\e[H--- LED [ %s ] CLK %d\e[K\n", $leds, $CLK;
539
540 $scr .= "\e[?5" . ($DC11_REVERSE ? "h" : "l");
541
542 line:
543 for my $y (0 .. 25) { # ntsc, two vblank delay lines, up to 24 text lines
544 my $prev_sgr;
545
546 $scr .= sprintf "%2d \xe2\x94\x82", $y;
547
548 for (0..139) {
549 my $c = $M[$i];
550
551 if ($c == 0x7f) { # also 0xff, but the firmware avoids that
552 $scr .= "\e[m\xe2\x94\x82\e[K\n";
553
554 my $a1 = $M[$i + 1];
555 my $a0 = $M[$i + 2];
556
557 $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
558
559 next line;
560 }
561
562 my $sgr = $SGR[ ($M[$i++ + 0x1000] & 15) | ($c & 0x80)];
563
564 $scr .= $prev_sgr = $sgr if $sgr ne $prev_sgr;
565
566 $scr .= $CHARMAP[$c & 0x7f];
567 }
568
569 $scr .= "\e[K\nvideo overflow\e[K\n";
570 last;
571 }
572
573 $scr .= "\e[m\e[J";
574
575 syswrite STDOUT, $scr;
576 }
577
578 #############################################################################
579 # keyboard handling
580
581 # 0x080 shift, 0x100 ctrl
582 my %KEYMAP = (
583 "\t" => 0x3a,
584 "\r" => 0x64,
585 "\n" => 0x44,
586
587 "\x00" => 0x77 | 0x100, # CTRL-SPACE
588 "\x1c" => 0x45 | 0x100, # CTRL-\
589 "\x1d" => 0x14 | 0x100, # CTRL-]
590 "\x1e" => 0x24 | 0x100, # CTRL-~
591 "\x1f" => 0x75 | 0x100, # CTRL-?
592
593 # hardcoded rxvt keys
594 "\e" => 0x2a, # ESC
595 "\e[3~" => 0x03, # DC
596 "\e[5~" => 0x7e, # CAPS LOCK (prior)
597 "\e[6~" => 0x6a, # NO SCROLL (next)
598 "\e[A" => 0x30, # UP
599 "\e[B" => 0x22, # DOWN
600 "\e[C" => 0x10, # RIGHT
601 "\e[D" => 0x20, # LEFT
602 "\e[a" => 0x30 | 0x080, # UP
603 "\e[b" => 0x22 | 0x080, # DOWN
604 "\e[c" => 0x10 | 0x080, # RIGHT
605 "\e[d" => 0x20 | 0x080, # LEFT
606 "\e[7~" => 0x7b, # SETUP (home)
607 "\e[8~" => 0x23, # BREAK (end)
608 "\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end)
609 "\x7f" => 0x33, # BACKSPACE
610
611 "\e[11~" => 0x32, # F1
612 "\e[11~" => 0x42, # F2
613 "\e[11~" => 0x31, # F3
614 "\e[11~" => 0x41, # F4
615 );
616
617 @KEYMAP{map chr, 0x20 .. 0x40, 0x5b .. 0x7e} = unpack "C*", pack "H*",
618 "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9" # 20..40
619 . "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4"; # 5b..7e
620
621 $KEYMAP{"\x1f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
622 $KEYMAP{"\x20" ^ $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
623
624 my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
625 $KEYMATCH = qr{^($KEYMATCH)}s;
626
627 my %KMOD; # currently pressed modifier keys
628
629 sub key {
630 my ($key) = @_;
631
632 push @KQUEUE, -0x7c if !($key & 0x100) && delete $KMOD{0x7c}; # ctrl-up
633 push @KQUEUE, -0x7d if !($key & 0x080) && delete $KMOD{0x7d}; # shift-up
634
635 push @KQUEUE, 0x7c if $key & 0x100 && !$KMOD{0x7c}++; # ctrl-down
636 push @KQUEUE, 0x7d if $key & 0x080 && !$KMOD{0x7d}++; # shift-down
637
638 $key &= 0x7f;
639 push @KQUEUE, $key, -$key;
640 }
641
642 my $STDIN_BUF;
643
644 sub stdin_parse {
645 key $KEYMAP{$1}
646 while $STDIN_BUF =~ s/$KEYMATCH//;
647
648 # skip input we can't decipher
649 substr $STDIN_BUF, 0, 1, "";
650 }
651
652 if ($KBD) {
653 system "stty -icanon -icrnl -inlcr -echo min 1 time 0";
654 eval q{ sub END { system "stty sane" } };
655 $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 };
656 }
657
658 #############################################################################
659 # initial key input, to set up online mode etc.
660 # could be done via nvram defaults
661
662 @KQUEUE = (
663 0x7b, -0x7b, # setup
664 0, # delay
665 0x28, -0x28, # 4, toggle local/online
666 0x38, -0x38, # 5, setup b
667 0, # delay
668 (0x10, -0x10) x 2, # cursor right
669 0x37, -0x37, # 6 toggle soft scroll
670 (0x10, -0x10) x 1, # cursor right
671 0x37, -0x37, # 6 toggle autorepeat off
672 (0x10, -0x10) x 8, # cursor right
673 0x37, -0x37, # 6 toggle keyclick
674 (0x10, -0x10) x 1, # cursor right
675 $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
676 (0x10, -0x10) x 7, # cursor right
677 0x37, -0x37, # 6 toggle wrap around
678 0x7b, -0x7b, # leave setup
679 );
680
681 #############################################################################
682 # process/pty management
683
684 require IO::Pty;
685 $PTY = IO::Pty->new;
686
687 my $slave = $PTY->slave;
688
689 $PTY->set_winsize (24, 80);
690
691 unless (fork) {
692 $ENV{LC_ALL} = "C";
693 $ENV{TERM} = $VT102 ? "vt102" : "vt100";
694
695 close $PTY;
696
697 open STDIN , "<&", $slave;
698 open STDOUT, ">&", $slave;
699 open STDERR, ">&", $slave;
700
701 system "stty ixoff erase ^H";
702
703 $PTY->make_slave_controlling_terminal;
704 $PTY->close_slave;
705
706 @ARGV = "sh" unless @ARGV;
707 exec @ARGV;
708 }
709
710 $PTY->close_slave;
711
712 #############################################################################
713 # the actual hardware simulator
714
715 my @ICACHE; # compiled instruction/basic block cache
716
717 my $POWERSAVE; # powersave counter
718
719 my $RIN; # libev for the less well-off
720
721 (vec $RIN, 0, 1) = 1 if $KBD;
722 (vec $RIN, fileno $PTY, 1) = 1 if $PTY;
723
724 # the cpu.
725 while () {
726 # execute extended basic blocks
727 $PC = ($ICACHE[$PC] ||= do {
728 my $pc = $PC;
729
730 my $insn = "";
731
732 # the jit compiler
733 for (0..31) {
734 my $imm;
735 my $op = $op[$M[$pc++]];
736
737 for ($op) {
738 s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
739 s/\bPOP\b/\$M[\$SP++]/g; # pop byte from stack
740
741 s/\bIMM16\b/$imm \/\/= $M[$pc++] + $M[$pc++] * 256/xge; # 16 bit insn immediate
742 s/\bIMM8\b /$imm \/\/= $M[$pc++] /xge; # 8 bit insn immediate
743
744 s/\bPC\b/$pc/ge; # PC at end of insn
745 s/\bBRA\b/return/g; # conditional jump
746 s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump
747
748 s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge; # in insns call in_HEX
749 s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge; # out likewise
750 }
751
752 $insn .= "$op;\n";
753 }
754
755
756 $insn .= $pc;
757 $insn =~ s/\x00.*$//s;
758
759 eval "use integer; sub { $insn }" or die "$insn: $@"
760 })->();
761
762 ++$CLK;
763
764 # things we do from time to time only
765 unless ($CLK & 0xf) {
766 # do I/O
767
768 unless ($CLK & 0xfff) {
769 if (select $x = $RIN, undef, undef, $POWERSAVE < 100 ? 0 : 0.2) {
770 # pty/serial I/O
771 if ($PTY && (vec $x, fileno $PTY, 1) && (@PUSARTRECV < 128) && !@KQUEUE) {
772 sysread $PTY, my $buf, 256;
773
774 # linux don't do cs7 and/or parity anymore, so we need to filter
775 # out xoff characters to avoid freezes.
776 push @PUSARTRECV, grep { ($_ & 0x7f) != 0x13 } unpack "C*", $buf;
777 }
778
779 # keyboard input
780 if ($KBD && (vec $x, 0, 1)) {
781 # to avoid non-blocking mode on stdin (and stty min 0), we
782 # just read byte-by-byte after a select says there is data.
783 while (select my $rin = "\x01", undef, undef, 0) {
784 sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF
785 or last;
786 }
787
788 stdin_parse if length $STDIN_BUF;
789 }
790
791 $POWERSAVE = 0; # activity
792 } else {
793 ++$POWERSAVE unless @PUSARTRECV || @KQUEUE;
794 }
795 }
796
797 # kick off serial input interrupt quite often
798 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though)
799 #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy
800
801 # kick off vertical retrace interrupt from time to time
802 unless ($CLK & 0x1ff) {
803 $RST |= 4; # vertical retrace
804 }
805
806 # handle video hardware
807 unless ($CLK & 0x3fff) {
808 display;
809 }
810 }
811
812 # the interrupt logic - we only interrupt after basic blocks
813 # which, as a side effect, ensures that we don't interrupt
814 # "ei; ret" sequences and thus reduce the risk of stack overflows.
815 if (($RST || ($INTPEND & ~$INTMASK)) && $IFF) {
816 # rst 1 kbd data available
817 # rst 2 pusart xmit+recv flag
818 # rst 4 vertical retrace
819 # 5.5 vt125 mb7 trans ready (serial send?)
820 # 6.5 vt125 mb7 read ready (something modem?)
821 # 7.5 vt125 mb7 vblank h(?)
822 # trap vt125 mbi init h(?)
823 my $vec;
824
825 my $pend = $INTPEND & ~$INTMASK;
826
827 if ($pend & 1) { $vec = 0x2c; $INTPEND &= ~1;
828 } elsif ($pend & 2) { $vec = 0x34; $INTPEND &= ~2;
829 } elsif ($pend & 4) { $vec = 0x3c; $INTPEND &= ~4;
830 # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # the vt102 firmware doesn't like combined interrupts
831 } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
832 } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
833 } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
834 } else {
835 die;
836 }
837
838 # jump to the interrupt vector
839 $M[--$SP] = $PC >> 8;
840 $M[--$SP] = $PC & 0xff;
841 $PC = $vec;
842
843 $IFF = 0;
844 }
845 }
846
847 #############################################################################
848 # roms in the data section + one newline
849 #
850 # vt100 @ 0x0000+0x0800 23-032E2
851 # vt100 @ 0x0800+0x0800 23-061E2
852 # vt100 @ 0x1000+0x0800 23-033E2
853 # vt100 @ 0x1800+0x0800 23-034E2
854 #
855 # vt102 @ 0x0000+0x2000 23-226E4
856 # vt102 @ 0x8000+0x2000 23-225E4
857 #
858 # vt131 @ 0xa000+0x0800 23-280E2
859 #
860
861 __DATA__
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