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Revision: 1.2
Committed: Mon Dec 1 15:37:50 2014 UTC (9 years, 5 months ago) by root
Branch: MAIN
Changes since 1.1: +19 -2 lines
Log Message:
*** empty log message ***

File Contents

# User Rev Content
1 root 1.1 #!/opt/bin/perl
2    
3 root 1.2 #
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 root 1.1 # this hack is not considered release ready in and way, shape, or form
21     # ./vt102 bash
22     # ./vt102 telnet towel.blinkenlights.nl
23     # ./vt102 curl http://artscene.textfiles.com/vt100/trekvid.vt
24     # ./vt102 curl http://artscene.textfiles.com/vt100/surf.vt # in 3d!
25    
26     use common::sense;
27    
28     $| = 1;
29    
30 root 1.2 my $VT102 = 0;
31 root 1.1 my $AVO = $VT102 || 1;
32     my $KBD = 1;
33    
34     #############################################################################
35    
36     my $PTY; # the pty we allocated, if any
37    
38     my $ROM = do {
39     binmode DATA;
40     local $/;
41     <DATA>
42     };
43    
44     0x6001 == length $ROM or die "corrupted rom image";
45    
46     binmode STDOUT;
47    
48     my @M = (0xff) x 65536; # main memory, = (0xff) x 65536;
49    
50     # populate mem with rom contents
51     if ($VT102) {
52     @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x2000, 0x2000;
53     @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROM, 0x4000, 0x2000;
54     } else {
55     @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x0000, 0x2000;
56     }
57    
58     #############################################################################
59    
60     my $PRSTATUS = 0;
61    
62     # 8080/8085 registers
63     # b, c, d, e, h, l, a
64     my ($A, $B, $C, $D, $E, $H, $L, $A);
65     my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC);
66    
67     my $RST = 0; # 8080 pending interrupts
68     my $INTMASK = 7; # 8085 half interrupts
69     my $INTPEND = 0; # 8085 half interrupts
70    
71     my $x; # dummy temp for instructions
72    
73     my $CLK; # rather inexact clock
74    
75     #############################################################################
76    
77     # nvram
78     my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
79     my $NVRADDR;
80     my $NVRDATA;
81     my $NVRLATCH;
82    
83     #$NVR[$_] = $_ for 0..99;#d#
84    
85     my @NVRCMD = (
86     sub { # accept data
87     $NVRDATA = ($NVRDATA << 1) + $_[1];
88     },
89     sub { # accept addr
90     $NVRADDR = ($NVRADDR << 1)+ $_[1];
91     },
92     sub { # shift out
93     my $bit = $NVRDATA & 0x02000;
94     $NVRDATA *= 2;
95     $bit
96     },
97     undef,
98     sub { # write
99     print "NVR WRITE $_[0]\n";#d#
100     $NVR[$_[0]] = $NVRDATA & 0x3fff;
101     },
102     sub { # erase
103     print "NVR ERASE $_[0]\n";#d#
104     $NVR[$_[0]] = 0x3fff;
105     },
106     sub { # read
107     # print "NVR READ $_[0] = $NVR[$_[0]]\n";#d#
108     $NVRDATA = $NVR[$_[0]];
109     },
110     sub { # standby
111     },
112     );
113    
114     my @bitidx;
115     $bitidx[1 << $_] = 9 - $_ for 0..9;
116    
117     # the nvr1400 state machine. what a monster
118     sub nvr() {
119     my $a1 = $bitidx[(~$NVRADDR ) & 0x3ff];
120     my $a0 = $bitidx[(~$NVRADDR >> 10) & 0x3ff];
121    
122     # printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA;
123    
124     $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
125     }
126    
127     #############################################################################
128    
129     my $DC11 = 0; # 4 bit commands
130     my $DC12 = 0;
131    
132     my $XON = 1; # false if terminal wants us to pause
133     my $PUSARTCMD;
134    
135     my @KXMIT; # current scan queue
136     my %KXMIT; # currently pressed keys
137     my @KQUEUE; # key event queue
138     my $KXCNT; # count for debouncew
139     my @PUSARTRECV;
140     my $KSTATUS;
141    
142     sub out_00 { # pusartdata
143     # handle xon/xoff, but also pass it through
144     if ($_[0] == 0x13) {
145     $XON = 0;
146     } elsif ($_[0] == 0x11) {
147     $XON = 1;
148     }
149    
150     syswrite $PTY, chr $_[0];
151    
152     $INTPEND |= 1; # 5.5 txrdy
153     }
154    
155     sub out_01 {
156     $PUSARTCMD = shift;
157    
158     $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy
159     $INTPEND |= 2 if $PUSARTCMD & 0x04; # VT102, 6.5 rxrdy
160     }
161    
162     sub out_02 { } # baudrate generator
163    
164     sub out_23 { } # unknown
165     sub out_27 { } # unknown
166     sub out_2f { } # unknown, connected to in 0f
167    
168     sub out_42 { } # brightness
169    
170     sub out_62 {
171     $NVRLATCH = shift;
172     }
173    
174     sub out_a2 { $DC11 = shift }
175     sub out_c2 { } # unknown
176     sub out_d2 { $DC12 = shift }
177    
178     sub out_82 {
179     # keyboard
180    
181     # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INSERT L1(?)
182     # CLICK STARTSCAN ONLINE LOCKED | LED1 LED2 LED3 LED4
183     $KSTATUS = $_[0];
184    
185     # start new scan unless scan in progress
186     if (($_[0] & 0x40) && !@KXMIT) {
187     # do not reply with keys in locked mode
188     # or during post (0xff),
189     # mostly to skip init and not fail POST,
190     # and to send startup keys only when terminal is ready
191     unless (($_[0] & 0x10) || ($_[0] == 0xff) || ($VT102 && $INTMASK == 0x07)) {
192     if ($KXCNT <= 0 && @KQUEUE) {
193     my $c = shift @KQUEUE;
194    
195     if ($c < 0) { # key up
196     delete $KXMIT{-$c};
197     $KXCNT = 10;
198     } elsif ($c > 0) { # key down
199     undef $KXMIT{$c};
200     $KXCNT = 10;
201     } else { # delay
202     $KXCNT = 100;
203     }
204     }
205    
206     --$KXCNT;
207     @KXMIT = sort keys %KXMIT;
208     }
209    
210     $RST |= 1;
211     }
212     }
213    
214     #############################################################################
215    
216     my $NVRBIT;
217     my $LBA;
218    
219     sub in_00 { # pusart data
220     # print "READ PUSARTDATA (@PUSARTRECV)\n";
221    
222     # $RST |= 2 if $#PUSARTRECV && $XON;
223     # $INTPEND |= 2 if $#PUSARTRECV && $XON;
224    
225     shift @PUSARTRECV
226     }
227    
228     sub in_01 { # pusart status
229     # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY
230     0x85 + (@PUSARTRECV && 0x02)
231     }
232    
233     sub in_22 { # modem buffer(?)
234     # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
235     0x20
236     }
237    
238     sub in_0f { } # unknown, connected to out 2f
239    
240     sub in_42 { # flag buffer
241     ++$LBA;
242     # ++$LBA;
243     # printf "%04x lba %04x, %04x\n", $PC, $LBA, $CLK;
244    
245     $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA & 0x3) == 0x2;
246    
247     # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
248    
249     my $f = 0x85 | $NVRBIT;
250    
251     $f |= 0x02 unless $AVO;
252     $f |= 0x40 if $LBA & 0x2;
253    
254     $f
255     }
256    
257     sub in_82 { # tbmt keyboard uart
258     return 0x7f unless @KXMIT;
259    
260     $RST |= 1;
261     shift @KXMIT
262     }
263    
264     sub in_03 { 0xff } # unknown, printer uart input?
265     sub in_0b { 0xff } # unknown
266     sub in_17 { 0xff } # unknown, printer status clear by reading?
267     sub in_1b { 0xff } # unknown
268    
269     #############################################################################
270    
271     sub sf {
272     $FS = $_[0] & 0x080;
273     $FZ = ($_[0] & 0x0ff) == 0;
274     $FC = $_[0] & 0x100;
275    
276     $_[0] & 0xff
277     }
278    
279     sub sf_nc {
280     $FS = $_[0] & 0x080;
281     $FZ = ($_[0] & 0x0ff) == 0;
282    
283     $_[0] & 0xff
284     }
285    
286     my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0 .. 255;
287     my @ops;
288    
289     my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A);
290     my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity
291    
292     # mov r,r / r,M / M,r
293     for my $s (0..7) {
294     for my $d (0..7) {
295     $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]";
296     }
297     }
298    
299     $op[0x00] = '';
300    
301     $op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
302     $op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
303     $op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
304     $op[0x31] = '$SP = IMM16' ; # lxi #d# 0xf000 because of limited stack
305    
306     $op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
307     $op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
308     $op[0x32] = '$M[IMM16 ] = $A'; # sta
309    
310     sub inxdcx($$$) {
311     $x = ($_[0] * 256 + $_[1] + $_[2]) & 0xffff;
312     $_[0] = $x >> 8;
313     $_[1] = $x & 0xff;
314     }
315    
316     $op[0x03] = 'inxdcx $B, $C, 1'; # inx
317     $op[0x13] = 'inxdcx $D, $E, 1'; # inx
318     $op[0x23] = 'inxdcx $H, $L, 1'; # inx
319     $op[0x33] = '$SP++' ; # inx
320     $op[0x0b] = 'inxdcx $B, $C, -1'; # dcx
321     $op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
322     $op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
323     $op[0x3b] = '--$SP' ; # dcx
324    
325     # "no carry" doesn't seem to be needed for vt100 - optimize?
326     $op[0x04 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] + 1" for 0..7; # inr
327     $op[0x05 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] - 1" for 0..7; # dcr
328    
329     # mvi r / M
330     $op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
331    
332     # getting this insn wrong (its the only 16 bit insn to modify flags)
333     # wasted three of my best days with mindless vt102 rom reverse engineering
334     sub dad {
335     $x = $H * 256 + $L + $_[0];
336    
337     ($H, $L) = (($x >> 8) & 0xff, $x & 0xff);
338     $FC = $x > 0xffff;
339     }
340    
341     $op[0x09] = 'dad $B * 256 + $C'; # dad
342     $op[0x19] = 'dad $D * 256 + $E'; # dad
343     $op[0x29] = 'dad $H * 256 + $L'; # dad
344     $op[0x39] = 'dad $SP '; # dad
345    
346     $op[0x07] = ' $FC = $A >> 7; $A = ($A * 2 + $FC) & 0xff '; # rlc
347     $op[0x17] = ' ($FC, $A) = ($A >> 7, ($A * 2 + $FC) & 0xff)'; # ral
348    
349     $op[0x0f] = ' $FC = $A & 1; $A = ($A >> 1) | ($FC && 0x80) '; # rrc
350     $op[0x1f] = ' ($FC, $A) = ($A & 1, ($A >> 1) | ($FC && 0x80))'; # rar
351    
352     $op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b
353     $op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d
354     $op[0x3a] = '$A = $M[IMM16]'; # lda
355    
356     $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete)
357     $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete)
358    
359     $op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld
360     $op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld
361    
362     # yeah, the fucking setup screens actually use daa...
363     $op[0x27] = '
364     my ($h, $l);
365    
366     ($h, $l) = ($A >> 4, $A & 15);
367    
368     if ($l > 9 || $FA) {
369     $A = sf $A + 6;
370     ($h, $l) = ($A >> 4, $A & 15);
371     }
372    
373     if ($h > 9 || $FC) {
374     $h += 6;
375     $A = ($h * 16 + $l) & 0xff;
376     }
377     '; # daa, almost certainly borked, also, acarry not set by sf
378    
379     $op[0x2f] = '$A ^= 0xff'; # cma
380    
381     $op[0x37] = '$FC = 1 '; # stc
382     $op[0x3f] = '$FC = !$FC'; # cmc
383    
384     $op[0x76] = 'die "HLT"'; # hlt
385    
386     $op[0x80 + $_] = '$A = sf $A + ' . $reg[$_] for 0..7; # add
387     $op[0x88 + $_] = '$A = sf $A + $FC + ' . $reg[$_] for 0..7; # adc
388     $op[0x90 + $_] = '$A = sf $A - ' . $reg[$_] for 0..7; # sub
389     $op[0x98 + $_] = '$A = sf $A - $FC - ' . $reg[$_] for 0..7; # sbb
390     $op[0xa0 + $_] = '$A = sf $A & ' . $reg[$_] for 0..7; # ana
391     $op[0xa8 + $_] = '$A = sf $A ^ ' . $reg[$_] for 0..7; # xra
392     $op[0xb0 + $_] = '$A = sf $A | ' . $reg[$_] for 0..7; # ora
393     $op[0xb8 + $_] = ' sf $A - ' . $reg[$_] for 0..7; # cmp
394     # possible todo: optimize ora a, maybe xra a
395    
396     $op[0xc6 + $_] = '$A = sf $A + IMM8'; # adi
397     $op[0xd6 + $_] = '$A = sf $A - IMM8'; # sui
398     $op[0xe6 + $_] = '$A = sf $A & IMM8'; # ani
399     $op[0xee + $_] = '$A = sf $A ^ IMM8'; # xri
400     $op[0xf6 + $_] = '$A = sf $A | IMM8'; # ori
401     $op[0xfe + $_] = ' sf $A - IMM8'; # cpi
402    
403     $op[0xc1] = '($C, $B) = (POP, POP)'; # pop
404     $op[0xd1] = '($E, $D) = (POP, POP)'; # pop
405     $op[0xe1] = '($L, $H) = (POP, POP)'; # pop
406     $op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = (!!($x & 0x80), !!($x & 0x40), !!($x & 0x10), !!($x & 0x04), !!($x & 0x01))'; # pop psw
407    
408     $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
409    
410     $op[0xc2 + $_ * 8] = 'BRA IMM16 ' . $cc[$_] for 0..7; # jcc
411     $op[0xc3] = 'JMP IMM16'; # jmp
412    
413     $op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) ' . $cc[$_] for 0..7; # ccc
414     $op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
415    
416     $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
417    
418     $op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 ' . $cc[$_] for 0..7; # rcc
419     $op[0xc9] = 'JMP POP + POP * 256'; # ret
420    
421     $op[0xc5] = 'PUSH $B; PUSH $C';
422     $op[0xd5] = 'PUSH $D; PUSH $E';
423     $op[0xe5] = 'PUSH $H; PUSH $L';
424     $op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
425    
426     $op[0xd3] = 'OUT'; # out
427     $op[0xdb] = 'IN'; # in
428    
429     # e3 xthl @ 917b, hl <-> (sp)
430    
431     $op[0xe9] = 'JMP $H * 256 + $L'; # pchl
432    
433     $op[0xf3] = '$IFF = 0'; # DI
434     $op[0xfb] = '$IFF = 1'; # EI
435    
436     @ops = @op; # for debugging #d#
437    
438     #############################################################################
439    
440     # print cpu status, for debugging
441     sub status {
442     my $PC = shift || $PC;
443    
444     printf "%04x/%04x A=%02x BC=%02x:%02x DE=%02x:%02x HL=%02x:%02x ZSCAP=%s: %02x %s\n",
445     $PC, $SP,
446     $A, $B, $C, $D, $E, $H, $L,
447     ($FZ ? "1" : "0")
448     . ($FS ? "1" : "0")
449     . ($FC ? "1" : "0")
450     . ($FA ? "1" : "0")
451     . ($FP ? "1" : "0"),
452     $M[$PC], $ops[$M[$PC]];
453     }
454    
455     #############################################################################
456    
457     my @chr = (
458     " ",
459     "\x{29eb}",
460     "\x{2592}",
461     "\x{2409}",
462     "\x{240c}",
463     "\x{240d}",
464     "\x{240a}",
465     "\x{00b0}",
466     "\x{00b1}",
467     "\x{2424}",
468     "\x{240b}",
469     "\x{2518}",
470     "\x{2510}",
471     "\x{250c}",
472     "\x{2514}",
473     "\x{253c}",
474     "\x{23ba}",
475     "\x{23bb}",
476     "\x{2500}",
477     "\x{23bc}",
478     "\x{23bd}",
479     "\x{251c}",
480     "\x{2524}",
481     "\x{2534}",
482     "\x{252c}",
483     "\x{2502}",
484     "\x{2264}",
485     "\x{2265}",
486     "\x{03c0}",
487     "\x{2260}",
488 root 1.2 "\x{00a3}",
489 root 1.1 "\x{00b7}",
490     (map chr, 0x020 .. 0x7e),
491     "?",
492     );
493    
494     utf8::encode $_ for @chr;
495    
496     sub prscr {
497     my $i = 0x2000;
498    
499     my $scr = sprintf "\x1b[H--- KBD %08b CLK %d PC %04x RST %03b IFF %01b PUS %02x IM %03b\x1b[K\n", $KSTATUS, $CLK, $PC, $RST, $IFF, $PUSARTCMD, $INTMASK;
500    
501     line:
502     for my $y (0 .. 25) {
503     $scr .= sprintf "%2d |", ++$y;
504    
505     for (0..140) {
506     my $c = $M[$i++];
507    
508     # printf "%04x %02x\n", $i-1,$c;
509    
510     if ($c == 0x7f) { # also 0xff, but the firmware avoids that
511     $scr .= "|\x1b[K\n";
512    
513     my $a1 = $M[$i++];
514     my $a0 = $M[$i++];
515    
516     $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
517    
518     next line;
519     }
520    
521     $scr .= "\x1b[7m" if $c & 0x80;
522     $scr .= $chr[$c & 0x7f] // sprintf "[%02x]", $c & 0x7f;
523     $scr .= "\x1b[m" if $c & 0x80;
524     }
525    
526     $scr .= "\x1b[K\noverflow\x1b[K\n";
527     last;
528     }
529    
530     if (0) {
531     $scr .= "\x1b[K\n";
532     for my $o (0x200 .. 0x232) {
533     $scr .= sprintf "%04x:", $o * 16;
534     for (0..15) {
535     $scr .= sprintf " %02x", $M[$o * 16 + $_];
536     }
537     $scr .= "\x1b[K\n";
538     }
539     }
540    
541     $scr .= "\x1b[J";
542    
543     syswrite STDOUT, $scr;
544     }
545    
546     #############################################################################
547    
548     if (@ARGV) {
549     require IO::Pty;
550     $PTY = IO::Pty->new;
551    
552     my $slave = $PTY->slave;
553    
554     unless (fork) {
555     $ENV{TERM} = $VT102 ? "vt102" : "vt100";
556    
557     close $PTY;
558    
559     open STDIN , "<&", $slave;
560     open STDOUT, ">&", $slave;
561     open STDERR, ">&", $slave;
562    
563     close $slave;
564    
565     exec @ARGV;
566     }
567    
568     close $slave;
569     } else {
570     open $PTY, "</dev/null" or die;#d
571     }
572    
573     #############################################################################
574    
575     # initial key input, to set up online mode etc.
576     @KQUEUE = (
577     0x7b, -0x7b, # setup
578     0, # delay
579     0x28, -0x28, # 4, toggle local/online
580     0x38, -0x38, # 5, setup b
581     0, # delay
582     (0x10, -0x10) x 2, # cursor right
583     0x37, -0x37, # 6 toggle soft scroll
584     (0x10, -0x10) x 1, # cursor right
585     0x37, -0x37, # 6 toggle autorepeat off
586     (0x10, -0x10) x 8, # cursor right
587     0x37, -0x37, # 6 toggle keyclick
588     (0x10, -0x10) x 1, # cursor right
589     $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
590     (0x10, -0x10) x 7, # cursor right
591     0x37, -0x37, # 6 toggle wrap around
592     0x7b, -0x7b, # leave setup
593     );
594    
595     #############################################################################
596    
597     # 0x80 shift, 0x100 ctrl, 0x200 toggle
598     my %KEYMAP = (
599     "\t" => 0x3a,
600     "\r" => 0x64,
601     "\n" => 0x44,
602    
603     # hardcoded rxvt keys
604     "\e" => 0x2a, # ESC
605     "\e[3~" => 0x03, # DC
606     "\e[5~" => 0x7e, # CAPS LOCK (prior)
607     "\e[6~" => 0x6a, # NO SCROLL (next)
608     "\e[A" => 0x30, # UP
609     "\e[B" => 0x22, # DOWN
610     "\e[C" => 0x10, # RIGHT
611     "\e[D" => 0x20, # LEFT
612     "\e[a" => 0x30 | 0x080, # UP
613     "\e[b" => 0x22 | 0x080, # DOWN
614     "\e[c" => 0x10 | 0x080, # RIGHT
615     "\e[d" => 0x20 | 0x080, # LEFT
616     "\e[7~" => 0x7b, # SETUP (home)
617     "\e[8~" => 0x23, # BREAK (end)
618     "\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end)
619     "\x7f" => 0x33, # BACKSPACE
620    
621     "\e[11~" => 0x32, # F1
622     "\e[11~" => 0x42, # F2
623     "\e[11~" => 0x31, # F3
624     "\e[11~" => 0x41, # F4
625     );
626    
627     @KEYMAP{map chr, 0x20..0x40} = unpack "C*", pack "H*",
628     "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9";
629    
630     @KEYMAP{map chr, 0x5b .. 0x7e} = unpack "C*", pack "H*",
631     "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4";
632    
633     $KEYMAP{"\x3f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
634     $KEYMAP{uc $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
635    
636     my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
637     $KEYMATCH = qr{^($KEYMATCH)}s;
638    
639     sub key {
640     my ($key) = @_;
641    
642     state %MOD;
643    
644     push @KQUEUE, -0x7c if !($key & 0x100) && delete $MOD{0x7c}; # ctrl-up
645     push @KQUEUE, -0x7d if !($key & 0x080) && delete $MOD{0x7d}; # shift-up
646    
647     push @KQUEUE, 0x7c if $key & 0x100 && !$MOD{0x7c}++; # ctrl-down
648     push @KQUEUE, 0x7d if $key & 0x080 && !$MOD{0x7d}++; # shift-down
649    
650     $key &= 0x7f;
651     push @KQUEUE, $key, -$key;
652     }
653    
654     my $STDIN_BUF;
655    
656     sub stdin_parse {
657     key $KEYMAP{$1}
658     while $STDIN_BUF =~ s/$KEYMATCH//;
659    
660     # skip input we can't decipher
661     substr $STDIN_BUF, 0, 1, "";
662     }
663    
664     if ($KBD) {
665     system "stty -icanon -icrnl -inlcr -echo min 1 time 0";
666     eval q{ sub END { system "stty sane" } };
667     $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 };
668     }
669    
670     #############################################################################
671    
672     my @ICACHE; # compiled instruction cache
673    
674     # the cpu
675     while () {
676    
677     # execute extended basic blocks
678     $PC = ($ICACHE[$PC] ||= do {
679     my $pc = $PC;
680    
681     my $insn = "";
682    
683     # the jit compiler
684     for (0..15) {
685    
686     # optional tracing support
687     if (0) {
688     $insn .= qq<
689     if (\$PRSTATUS) {
690     status $pc;
691     die unless --\$PRSTATUS;
692     }
693     >;
694     }
695    
696     my $imm;
697     my $op = $op[$M[$pc++]];
698    
699     for ($op) {
700     s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
701     s/\bPOP\b/\$M[\$SP++]/g; # pop byte from stack
702    
703     s/\bIMM16\b/$imm \/\/= $M[$pc++] + $M[$pc++] * 256/xge; # 16 bit insn immediate
704     s/\bIMM8\b /$imm \/\/= $M[$pc++] /xge; # 8 bit insn immediate
705    
706     s/\bPC\b/$pc/ge; # PC at end of insn
707     s/\bBRA\b/return/g; # conditional jump
708     s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump
709    
710     s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge;
711     s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge;
712     }
713    
714     $insn .= "$op;\n";
715     }
716    
717    
718     $insn .= "$pc";
719     $insn =~ s/\x00.*$//s;
720    
721     eval "use integer; sub { $insn }" or die "$insn: $@"
722     })->();
723    
724     ++$CLK;
725    
726     #TODO: just check on ret instructions or so
727     # the interrupt logic
728     $x = $INTPEND & ~$INTMASK;
729    
730     if (($RST || $x) && $IFF) {
731     # rst 1 kbd data available
732     # rst 2 pusart xmit+recv flag
733     # rst 4 vertical retrace
734     # 5.5 vt125 mb7 trans ready (serial send?)
735     # 6.5 vt125 mb7 read ready (something modem?)
736     # 7.5 vt125 mb7 vblank h(?)
737     # trap vt125 mbi init h(?)
738     my $vec;
739    
740     if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1;
741     } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2;
742     } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4;
743     # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # for some reason, this breaks vt102
744     } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
745     } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
746     } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
747     } else {
748     die;
749     }
750    
751     $M[--$SP] = $PC >> 8;
752     $M[--$SP] = $PC & 0xff;
753     $PC = $vec;
754    
755     $IFF = 0;
756     }
757    
758     # things we do from time too time only
759     unless ($CLK & 0xf) {
760     # do I/O
761    
762     unless ($CLK & 0x7ff) {
763    
764     # pty/serial I/O
765     unless (@PUSARTRECV || @KQUEUE || !$PTY) {
766     my $rin = ""; (vec $rin, fileno $PTY, 1) = 1;
767    
768     if (select $rin, undef, undef, 0) {
769     sysread $PTY, my $buf, 256;
770     push @PUSARTRECV, unpack "C*", $buf;
771     }
772     }
773    
774     # keyboard input
775     if ($KBD) {
776     while (select my $rin = "\x01", undef, undef, 0) {
777     sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF
778     or last;
779     }
780    
781     stdin_parse if length $STDIN_BUF;
782     }
783     }
784    
785     # kick off various interrupts
786    
787     $RST |= 2 if @PUSARTRECV && $XON;# vt100, also works on vt102, probably by accident
788     #$INTPEND |= 2 if @PUSARTRECV && $XON;# real vt102 probably does it this way
789    
790     unless ($CLK & 0x3ff) {
791     $RST |= 4; # vertical retrace
792     }
793    
794     # handle video hardware
795    
796     unless ($CLK & 0x1fff) {
797     prscr;
798     }
799     }
800     }
801    
802     __DATA__
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