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/cvs/vt102/vt102
Revision: 1.1
Committed: Mon Dec 1 14:58:52 2014 UTC (9 years, 5 months ago) by root
Branch: MAIN
Log Message:
*** empty log message ***

File Contents

# User Rev Content
1 root 1.1 #!/opt/bin/perl
2    
3     # this hack is not considered release ready in and way, shape, or form
4     # ./vt102 bash
5     # ./vt102 telnet towel.blinkenlights.nl
6     # ./vt102 curl http://artscene.textfiles.com/vt100/trekvid.vt
7     # ./vt102 curl http://artscene.textfiles.com/vt100/surf.vt # in 3d!
8    
9     use common::sense;
10    
11     $| = 1;
12    
13     my $VT102 = 1;
14     my $AVO = $VT102 || 1;
15     my $KBD = 1;
16    
17     #############################################################################
18    
19     my $PTY; # the pty we allocated, if any
20    
21     my $ROM = do {
22     binmode DATA;
23     local $/;
24     <DATA>
25     };
26    
27     0x6001 == length $ROM or die "corrupted rom image";
28    
29     binmode STDOUT;
30    
31     my @M = (0xff) x 65536; # main memory, = (0xff) x 65536;
32    
33     # populate mem with rom contents
34     if ($VT102) {
35     @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x2000, 0x2000;
36     @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROM, 0x4000, 0x2000;
37     } else {
38     @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x0000, 0x2000;
39     }
40    
41     #############################################################################
42    
43     my $PRSTATUS = 0;
44    
45     # 8080/8085 registers
46     # b, c, d, e, h, l, a
47     my ($A, $B, $C, $D, $E, $H, $L, $A);
48     my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC);
49    
50     my $RST = 0; # 8080 pending interrupts
51     my $INTMASK = 7; # 8085 half interrupts
52     my $INTPEND = 0; # 8085 half interrupts
53    
54     my $x; # dummy temp for instructions
55    
56     my $CLK; # rather inexact clock
57    
58     #############################################################################
59    
60     # nvram
61     my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
62     my $NVRADDR;
63     my $NVRDATA;
64     my $NVRLATCH;
65    
66     #$NVR[$_] = $_ for 0..99;#d#
67    
68     my @NVRCMD = (
69     sub { # accept data
70     $NVRDATA = ($NVRDATA << 1) + $_[1];
71     },
72     sub { # accept addr
73     $NVRADDR = ($NVRADDR << 1)+ $_[1];
74     },
75     sub { # shift out
76     my $bit = $NVRDATA & 0x02000;
77     $NVRDATA *= 2;
78     $bit
79     },
80     undef,
81     sub { # write
82     print "NVR WRITE $_[0]\n";#d#
83     $NVR[$_[0]] = $NVRDATA & 0x3fff;
84     },
85     sub { # erase
86     print "NVR ERASE $_[0]\n";#d#
87     $NVR[$_[0]] = 0x3fff;
88     },
89     sub { # read
90     # print "NVR READ $_[0] = $NVR[$_[0]]\n";#d#
91     $NVRDATA = $NVR[$_[0]];
92     },
93     sub { # standby
94     },
95     );
96    
97     my @bitidx;
98     $bitidx[1 << $_] = 9 - $_ for 0..9;
99    
100     # the nvr1400 state machine. what a monster
101     sub nvr() {
102     my $a1 = $bitidx[(~$NVRADDR ) & 0x3ff];
103     my $a0 = $bitidx[(~$NVRADDR >> 10) & 0x3ff];
104    
105     # printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA;
106    
107     $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
108     }
109    
110     #############################################################################
111    
112     my $DC11 = 0; # 4 bit commands
113     my $DC12 = 0;
114    
115     my $XON = 1; # false if terminal wants us to pause
116     my $PUSARTCMD;
117    
118     my @KXMIT; # current scan queue
119     my %KXMIT; # currently pressed keys
120     my @KQUEUE; # key event queue
121     my $KXCNT; # count for debouncew
122     my @PUSARTRECV;
123     my $KSTATUS;
124    
125     sub out_00 { # pusartdata
126     # handle xon/xoff, but also pass it through
127     if ($_[0] == 0x13) {
128     $XON = 0;
129     } elsif ($_[0] == 0x11) {
130     $XON = 1;
131     }
132    
133     syswrite $PTY, chr $_[0];
134    
135     $INTPEND |= 1; # 5.5 txrdy
136     }
137    
138     sub out_01 {
139     $PUSARTCMD = shift;
140    
141     $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy
142     $INTPEND |= 2 if $PUSARTCMD & 0x04; # VT102, 6.5 rxrdy
143     }
144    
145     sub out_02 { } # baudrate generator
146    
147     sub out_23 { } # unknown
148     sub out_27 { } # unknown
149     sub out_2f { } # unknown, connected to in 0f
150    
151     sub out_42 { } # brightness
152    
153     sub out_62 {
154     $NVRLATCH = shift;
155     }
156    
157     sub out_a2 { $DC11 = shift }
158     sub out_c2 { } # unknown
159     sub out_d2 { $DC12 = shift }
160    
161     sub out_82 {
162     # keyboard
163    
164     # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INSERT L1(?)
165     # CLICK STARTSCAN ONLINE LOCKED | LED1 LED2 LED3 LED4
166     $KSTATUS = $_[0];
167    
168     # start new scan unless scan in progress
169     if (($_[0] & 0x40) && !@KXMIT) {
170     # do not reply with keys in locked mode
171     # or during post (0xff),
172     # mostly to skip init and not fail POST,
173     # and to send startup keys only when terminal is ready
174     unless (($_[0] & 0x10) || ($_[0] == 0xff) || ($VT102 && $INTMASK == 0x07)) {
175     if ($KXCNT <= 0 && @KQUEUE) {
176     my $c = shift @KQUEUE;
177    
178     if ($c < 0) { # key up
179     delete $KXMIT{-$c};
180     $KXCNT = 10;
181     } elsif ($c > 0) { # key down
182     undef $KXMIT{$c};
183     $KXCNT = 10;
184     } else { # delay
185     $KXCNT = 100;
186     }
187     }
188    
189     --$KXCNT;
190     @KXMIT = sort keys %KXMIT;
191     }
192    
193     $RST |= 1;
194     }
195     }
196    
197     #############################################################################
198    
199     my $NVRBIT;
200     my $LBA;
201    
202     sub in_00 { # pusart data
203     # print "READ PUSARTDATA (@PUSARTRECV)\n";
204    
205     # $RST |= 2 if $#PUSARTRECV && $XON;
206     # $INTPEND |= 2 if $#PUSARTRECV && $XON;
207    
208     shift @PUSARTRECV
209     }
210    
211     sub in_01 { # pusart status
212     # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY
213     0x85 + (@PUSARTRECV && 0x02)
214     }
215    
216     sub in_22 { # modem buffer(?)
217     # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
218     0x20
219     }
220    
221     sub in_0f { } # unknown, connected to out 2f
222    
223     sub in_42 { # flag buffer
224     ++$LBA;
225     # ++$LBA;
226     # printf "%04x lba %04x, %04x\n", $PC, $LBA, $CLK;
227    
228     $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA & 0x3) == 0x2;
229    
230     # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
231    
232     my $f = 0x85 | $NVRBIT;
233    
234     $f |= 0x02 unless $AVO;
235     $f |= 0x40 if $LBA & 0x2;
236    
237     $f
238     }
239    
240     sub in_82 { # tbmt keyboard uart
241     return 0x7f unless @KXMIT;
242    
243     $RST |= 1;
244     shift @KXMIT
245     }
246    
247     sub in_03 { 0xff } # unknown, printer uart input?
248     sub in_0b { 0xff } # unknown
249     sub in_17 { 0xff } # unknown, printer status clear by reading?
250     sub in_1b { 0xff } # unknown
251    
252     #############################################################################
253    
254     sub sf {
255     $FS = $_[0] & 0x080;
256     $FZ = ($_[0] & 0x0ff) == 0;
257     $FC = $_[0] & 0x100;
258    
259     $_[0] & 0xff
260     }
261    
262     sub sf_nc {
263     $FS = $_[0] & 0x080;
264     $FZ = ($_[0] & 0x0ff) == 0;
265    
266     $_[0] & 0xff
267     }
268    
269     my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0 .. 255;
270     my @ops;
271    
272     my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A);
273     my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity
274    
275     # mov r,r / r,M / M,r
276     for my $s (0..7) {
277     for my $d (0..7) {
278     $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]";
279     }
280     }
281    
282     $op[0x00] = '';
283    
284     $op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
285     $op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
286     $op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
287     $op[0x31] = '$SP = IMM16' ; # lxi #d# 0xf000 because of limited stack
288    
289     $op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
290     $op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
291     $op[0x32] = '$M[IMM16 ] = $A'; # sta
292    
293     sub inxdcx($$$) {
294     $x = ($_[0] * 256 + $_[1] + $_[2]) & 0xffff;
295     $_[0] = $x >> 8;
296     $_[1] = $x & 0xff;
297     }
298    
299     $op[0x03] = 'inxdcx $B, $C, 1'; # inx
300     $op[0x13] = 'inxdcx $D, $E, 1'; # inx
301     $op[0x23] = 'inxdcx $H, $L, 1'; # inx
302     $op[0x33] = '$SP++' ; # inx
303     $op[0x0b] = 'inxdcx $B, $C, -1'; # dcx
304     $op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
305     $op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
306     $op[0x3b] = '--$SP' ; # dcx
307    
308     # "no carry" doesn't seem to be needed for vt100 - optimize?
309     $op[0x04 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] + 1" for 0..7; # inr
310     $op[0x05 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] - 1" for 0..7; # dcr
311    
312     # mvi r / M
313     $op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
314    
315     # getting this insn wrong (its the only 16 bit insn to modify flags)
316     # wasted three of my best days with mindless vt102 rom reverse engineering
317     sub dad {
318     $x = $H * 256 + $L + $_[0];
319    
320     ($H, $L) = (($x >> 8) & 0xff, $x & 0xff);
321     $FC = $x > 0xffff;
322     }
323    
324     $op[0x09] = 'dad $B * 256 + $C'; # dad
325     $op[0x19] = 'dad $D * 256 + $E'; # dad
326     $op[0x29] = 'dad $H * 256 + $L'; # dad
327     $op[0x39] = 'dad $SP '; # dad
328    
329     $op[0x07] = ' $FC = $A >> 7; $A = ($A * 2 + $FC) & 0xff '; # rlc
330     $op[0x17] = ' ($FC, $A) = ($A >> 7, ($A * 2 + $FC) & 0xff)'; # ral
331    
332     $op[0x0f] = ' $FC = $A & 1; $A = ($A >> 1) | ($FC && 0x80) '; # rrc
333     $op[0x1f] = ' ($FC, $A) = ($A & 1, ($A >> 1) | ($FC && 0x80))'; # rar
334    
335     $op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b
336     $op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d
337     $op[0x3a] = '$A = $M[IMM16]'; # lda
338    
339     $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete)
340     $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete)
341    
342     $op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld
343     $op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld
344    
345     # yeah, the fucking setup screens actually use daa...
346     $op[0x27] = '
347     my ($h, $l);
348    
349     ($h, $l) = ($A >> 4, $A & 15);
350    
351     if ($l > 9 || $FA) {
352     $A = sf $A + 6;
353     ($h, $l) = ($A >> 4, $A & 15);
354     }
355    
356     if ($h > 9 || $FC) {
357     $h += 6;
358     $A = ($h * 16 + $l) & 0xff;
359     }
360     '; # daa, almost certainly borked, also, acarry not set by sf
361    
362     $op[0x2f] = '$A ^= 0xff'; # cma
363    
364     $op[0x37] = '$FC = 1 '; # stc
365     $op[0x3f] = '$FC = !$FC'; # cmc
366    
367     $op[0x76] = 'die "HLT"'; # hlt
368    
369     $op[0x80 + $_] = '$A = sf $A + ' . $reg[$_] for 0..7; # add
370     $op[0x88 + $_] = '$A = sf $A + $FC + ' . $reg[$_] for 0..7; # adc
371     $op[0x90 + $_] = '$A = sf $A - ' . $reg[$_] for 0..7; # sub
372     $op[0x98 + $_] = '$A = sf $A - $FC - ' . $reg[$_] for 0..7; # sbb
373     $op[0xa0 + $_] = '$A = sf $A & ' . $reg[$_] for 0..7; # ana
374     $op[0xa8 + $_] = '$A = sf $A ^ ' . $reg[$_] for 0..7; # xra
375     $op[0xb0 + $_] = '$A = sf $A | ' . $reg[$_] for 0..7; # ora
376     $op[0xb8 + $_] = ' sf $A - ' . $reg[$_] for 0..7; # cmp
377     # possible todo: optimize ora a, maybe xra a
378    
379     $op[0xc6 + $_] = '$A = sf $A + IMM8'; # adi
380     $op[0xd6 + $_] = '$A = sf $A - IMM8'; # sui
381     $op[0xe6 + $_] = '$A = sf $A & IMM8'; # ani
382     $op[0xee + $_] = '$A = sf $A ^ IMM8'; # xri
383     $op[0xf6 + $_] = '$A = sf $A | IMM8'; # ori
384     $op[0xfe + $_] = ' sf $A - IMM8'; # cpi
385    
386     $op[0xc1] = '($C, $B) = (POP, POP)'; # pop
387     $op[0xd1] = '($E, $D) = (POP, POP)'; # pop
388     $op[0xe1] = '($L, $H) = (POP, POP)'; # pop
389     $op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = (!!($x & 0x80), !!($x & 0x40), !!($x & 0x10), !!($x & 0x04), !!($x & 0x01))'; # pop psw
390    
391     $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
392    
393     $op[0xc2 + $_ * 8] = 'BRA IMM16 ' . $cc[$_] for 0..7; # jcc
394     $op[0xc3] = 'JMP IMM16'; # jmp
395    
396     $op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) ' . $cc[$_] for 0..7; # ccc
397     $op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
398    
399     $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
400    
401     $op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 ' . $cc[$_] for 0..7; # rcc
402     $op[0xc9] = 'JMP POP + POP * 256'; # ret
403    
404     $op[0xc5] = 'PUSH $B; PUSH $C';
405     $op[0xd5] = 'PUSH $D; PUSH $E';
406     $op[0xe5] = 'PUSH $H; PUSH $L';
407     $op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
408    
409     $op[0xd3] = 'OUT'; # out
410     $op[0xdb] = 'IN'; # in
411    
412     # e3 xthl @ 917b, hl <-> (sp)
413    
414     $op[0xe9] = 'JMP $H * 256 + $L'; # pchl
415    
416     $op[0xf3] = '$IFF = 0'; # DI
417     $op[0xfb] = '$IFF = 1'; # EI
418    
419     @ops = @op; # for debugging #d#
420    
421     #############################################################################
422    
423     # print cpu status, for debugging
424     sub status {
425     my $PC = shift || $PC;
426    
427     printf "%04x/%04x A=%02x BC=%02x:%02x DE=%02x:%02x HL=%02x:%02x ZSCAP=%s: %02x %s\n",
428     $PC, $SP,
429     $A, $B, $C, $D, $E, $H, $L,
430     ($FZ ? "1" : "0")
431     . ($FS ? "1" : "0")
432     . ($FC ? "1" : "0")
433     . ($FA ? "1" : "0")
434     . ($FP ? "1" : "0"),
435     $M[$PC], $ops[$M[$PC]];
436     }
437    
438     #############################################################################
439    
440     my @chr = (
441     " ",
442     "\x{29eb}",
443     "\x{2592}",
444     "\x{2409}",
445     "\x{240c}",
446     "\x{240d}",
447     "\x{240a}",
448     "\x{00b0}",
449     "\x{00b1}",
450     "\x{2424}",
451     "\x{240b}",
452     "\x{2518}",
453     "\x{2510}",
454     "\x{250c}",
455     "\x{2514}",
456     "\x{253c}",
457     "\x{23ba}",
458     "\x{23bb}",
459     "\x{2500}",
460     "\x{23bc}",
461     "\x{23bd}",
462     "\x{251c}",
463     "\x{2524}",
464     "\x{2534}",
465     "\x{252c}",
466     "\x{2502}",
467     "\x{2264}",
468     "\x{2265}",
469     "\x{03c0}",
470     "\x{2260}",
471     "\x{0142}",
472     "\x{00b7}",
473     (map chr, 0x020 .. 0x7e),
474     "?",
475     );
476    
477     utf8::encode $_ for @chr;
478    
479     sub prscr {
480     my $i = 0x2000;
481    
482     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;
483    
484     line:
485     for my $y (0 .. 25) {
486     $scr .= sprintf "%2d |", ++$y;
487    
488     for (0..140) {
489     my $c = $M[$i++];
490    
491     # printf "%04x %02x\n", $i-1,$c;
492    
493     if ($c == 0x7f) { # also 0xff, but the firmware avoids that
494     $scr .= "|\x1b[K\n";
495    
496     my $a1 = $M[$i++];
497     my $a0 = $M[$i++];
498    
499     $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
500    
501     next line;
502     }
503    
504     $scr .= "\x1b[7m" if $c & 0x80;
505     $scr .= $chr[$c & 0x7f] // sprintf "[%02x]", $c & 0x7f;
506     $scr .= "\x1b[m" if $c & 0x80;
507     }
508    
509     $scr .= "\x1b[K\noverflow\x1b[K\n";
510     last;
511     }
512    
513     if (0) {
514     $scr .= "\x1b[K\n";
515     for my $o (0x200 .. 0x232) {
516     $scr .= sprintf "%04x:", $o * 16;
517     for (0..15) {
518     $scr .= sprintf " %02x", $M[$o * 16 + $_];
519     }
520     $scr .= "\x1b[K\n";
521     }
522     }
523    
524     $scr .= "\x1b[J";
525    
526     syswrite STDOUT, $scr;
527     }
528    
529     #############################################################################
530    
531     if (@ARGV) {
532     require IO::Pty;
533     $PTY = IO::Pty->new;
534    
535     my $slave = $PTY->slave;
536    
537     unless (fork) {
538     $ENV{TERM} = $VT102 ? "vt102" : "vt100";
539    
540     close $PTY;
541    
542     open STDIN , "<&", $slave;
543     open STDOUT, ">&", $slave;
544     open STDERR, ">&", $slave;
545    
546     close $slave;
547    
548     exec @ARGV;
549     }
550    
551     close $slave;
552     } else {
553     open $PTY, "</dev/null" or die;#d
554     }
555    
556     #############################################################################
557    
558     # initial key input, to set up online mode etc.
559     @KQUEUE = (
560     0x7b, -0x7b, # setup
561     0, # delay
562     0x28, -0x28, # 4, toggle local/online
563     0x38, -0x38, # 5, setup b
564     0, # delay
565     (0x10, -0x10) x 2, # cursor right
566     0x37, -0x37, # 6 toggle soft scroll
567     (0x10, -0x10) x 1, # cursor right
568     0x37, -0x37, # 6 toggle autorepeat off
569     (0x10, -0x10) x 8, # cursor right
570     0x37, -0x37, # 6 toggle keyclick
571     (0x10, -0x10) x 1, # cursor right
572     $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
573     (0x10, -0x10) x 7, # cursor right
574     0x37, -0x37, # 6 toggle wrap around
575     0x7b, -0x7b, # leave setup
576     );
577    
578     #############################################################################
579    
580     # 0x80 shift, 0x100 ctrl, 0x200 toggle
581     my %KEYMAP = (
582     "\t" => 0x3a,
583     "\r" => 0x64,
584     "\n" => 0x44,
585    
586     # hardcoded rxvt keys
587     "\e" => 0x2a, # ESC
588     "\e[3~" => 0x03, # DC
589     "\e[5~" => 0x7e, # CAPS LOCK (prior)
590     "\e[6~" => 0x6a, # NO SCROLL (next)
591     "\e[A" => 0x30, # UP
592     "\e[B" => 0x22, # DOWN
593     "\e[C" => 0x10, # RIGHT
594     "\e[D" => 0x20, # LEFT
595     "\e[a" => 0x30 | 0x080, # UP
596     "\e[b" => 0x22 | 0x080, # DOWN
597     "\e[c" => 0x10 | 0x080, # RIGHT
598     "\e[d" => 0x20 | 0x080, # LEFT
599     "\e[7~" => 0x7b, # SETUP (home)
600     "\e[8~" => 0x23, # BREAK (end)
601     "\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end)
602     "\x7f" => 0x33, # BACKSPACE
603    
604     "\e[11~" => 0x32, # F1
605     "\e[11~" => 0x42, # F2
606     "\e[11~" => 0x31, # F3
607     "\e[11~" => 0x41, # F4
608     );
609    
610     @KEYMAP{map chr, 0x20..0x40} = unpack "C*", pack "H*",
611     "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9";
612    
613     @KEYMAP{map chr, 0x5b .. 0x7e} = unpack "C*", pack "H*",
614     "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4";
615    
616     $KEYMAP{"\x3f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
617     $KEYMAP{uc $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
618    
619     my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
620     $KEYMATCH = qr{^($KEYMATCH)}s;
621    
622     sub key {
623     my ($key) = @_;
624    
625     state %MOD;
626    
627     push @KQUEUE, -0x7c if !($key & 0x100) && delete $MOD{0x7c}; # ctrl-up
628     push @KQUEUE, -0x7d if !($key & 0x080) && delete $MOD{0x7d}; # shift-up
629    
630     push @KQUEUE, 0x7c if $key & 0x100 && !$MOD{0x7c}++; # ctrl-down
631     push @KQUEUE, 0x7d if $key & 0x080 && !$MOD{0x7d}++; # shift-down
632    
633     $key &= 0x7f;
634     push @KQUEUE, $key, -$key;
635     }
636    
637     my $STDIN_BUF;
638    
639     sub stdin_parse {
640     key $KEYMAP{$1}
641     while $STDIN_BUF =~ s/$KEYMATCH//;
642    
643     # skip input we can't decipher
644     substr $STDIN_BUF, 0, 1, "";
645     }
646    
647     if ($KBD) {
648     system "stty -icanon -icrnl -inlcr -echo min 1 time 0";
649     eval q{ sub END { system "stty sane" } };
650     $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 };
651     }
652    
653     #############################################################################
654    
655     my @ICACHE; # compiled instruction cache
656    
657     # the cpu
658     while () {
659    
660     # execute extended basic blocks
661     $PC = ($ICACHE[$PC] ||= do {
662     my $pc = $PC;
663    
664     my $insn = "";
665    
666     # the jit compiler
667     for (0..15) {
668    
669     # optional tracing support
670     if (0) {
671     $insn .= qq<
672     if (\$PRSTATUS) {
673     status $pc;
674     die unless --\$PRSTATUS;
675     }
676     >;
677     }
678    
679     my $imm;
680     my $op = $op[$M[$pc++]];
681    
682     for ($op) {
683     s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
684     s/\bPOP\b/\$M[\$SP++]/g; # pop byte from stack
685    
686     s/\bIMM16\b/$imm \/\/= $M[$pc++] + $M[$pc++] * 256/xge; # 16 bit insn immediate
687     s/\bIMM8\b /$imm \/\/= $M[$pc++] /xge; # 8 bit insn immediate
688    
689     s/\bPC\b/$pc/ge; # PC at end of insn
690     s/\bBRA\b/return/g; # conditional jump
691     s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump
692    
693     s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge;
694     s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge;
695     }
696    
697     $insn .= "$op;\n";
698     }
699    
700    
701     $insn .= "$pc";
702     $insn =~ s/\x00.*$//s;
703    
704     eval "use integer; sub { $insn }" or die "$insn: $@"
705     })->();
706    
707     ++$CLK;
708    
709     #TODO: just check on ret instructions or so
710     # the interrupt logic
711     $x = $INTPEND & ~$INTMASK;
712    
713     if (($RST || $x) && $IFF) {
714     # rst 1 kbd data available
715     # rst 2 pusart xmit+recv flag
716     # rst 4 vertical retrace
717     # 5.5 vt125 mb7 trans ready (serial send?)
718     # 6.5 vt125 mb7 read ready (something modem?)
719     # 7.5 vt125 mb7 vblank h(?)
720     # trap vt125 mbi init h(?)
721     my $vec;
722    
723     if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1;
724     } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2;
725     } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4;
726     # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # for some reason, this breaks vt102
727     } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
728     } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
729     } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
730     } else {
731     die;
732     }
733    
734     $M[--$SP] = $PC >> 8;
735     $M[--$SP] = $PC & 0xff;
736     $PC = $vec;
737    
738     $IFF = 0;
739     }
740    
741     # things we do from time too time only
742     unless ($CLK & 0xf) {
743     # do I/O
744    
745     unless ($CLK & 0x7ff) {
746    
747     # pty/serial I/O
748     unless (@PUSARTRECV || @KQUEUE || !$PTY) {
749     my $rin = ""; (vec $rin, fileno $PTY, 1) = 1;
750    
751     if (select $rin, undef, undef, 0) {
752     sysread $PTY, my $buf, 256;
753     push @PUSARTRECV, unpack "C*", $buf;
754     }
755     }
756    
757     # keyboard input
758     if ($KBD) {
759     while (select my $rin = "\x01", undef, undef, 0) {
760     sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF
761     or last;
762     }
763    
764     stdin_parse if length $STDIN_BUF;
765     }
766     }
767    
768     # kick off various interrupts
769    
770     $RST |= 2 if @PUSARTRECV && $XON;# vt100, also works on vt102, probably by accident
771     #$INTPEND |= 2 if @PUSARTRECV && $XON;# real vt102 probably does it this way
772    
773     unless ($CLK & 0x3ff) {
774     $RST |= 4; # vertical retrace
775     }
776    
777     # handle video hardware
778    
779     unless ($CLK & 0x1fff) {
780     prscr;
781     }
782     }
783     }
784    
785     __DATA__
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795     f#}rQ
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806     C
807     D
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810     I J
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828     !} L>w!3"@!b
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831     -
832     !!#s#<6/!!_6"!!>
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840     $
841     x
842     )
843     v"
844     >&  @&@+6+|0
845     #yӂ~M
846     |E
847     0J
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