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Revision: 1.5
Committed: Mon Dec 1 18:41:36 2014 UTC (9 years, 5 months ago) by root
Branch: MAIN
Changes since 1.4: +22 -65 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 root 1.3 # TODO: ctrl
27    
28 root 1.1 use common::sense;
29    
30     $| = 1;
31    
32 root 1.3 my $VT102 = 1;
33 root 1.1 my $AVO = $VT102 || 1;
34     my $KBD = 1;
35    
36     #############################################################################
37 root 1.5 # rom initialising
38 root 1.1
39     my $ROM = do {
40     binmode DATA;
41     local $/;
42     <DATA>
43     };
44    
45     0x6001 == length $ROM or die "corrupted rom image";
46    
47     binmode STDOUT;
48    
49     my @M = (0xff) x 65536; # main memory, = (0xff) x 65536;
50    
51     # populate mem with rom contents
52     if ($VT102) {
53     @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x2000, 0x2000;
54     @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROM, 0x4000, 0x2000;
55     } else {
56     @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x0000, 0x2000;
57     }
58    
59     #############################################################################
60 root 1.5 # cpu registers and I/O support
61 root 1.1
62 root 1.5 my $PTY; # the pty we allocated, if any
63 root 1.1 my $PRSTATUS = 0;
64    
65     # 8080/8085 registers
66     # b, c, d, e, h, l, a
67     my ($A, $B, $C, $D, $E, $H, $L, $A);
68     my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC);
69    
70     my $RST = 0; # 8080 pending interrupts
71     my $INTMASK = 7; # 8085 half interrupts
72     my $INTPEND = 0; # 8085 half interrupts
73    
74     my $x; # dummy temp for instructions
75    
76     my $CLK; # rather inexact clock
77    
78     #############################################################################
79 root 1.5 # the dreaded nvr1400 chip. not needed to get it going, but provided for reference
80 root 1.1
81     # nvram
82     my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
83     my $NVRADDR;
84     my $NVRDATA;
85     my $NVRLATCH;
86    
87     my @NVRCMD = (
88 root 1.5 sub { $NVRDATA = ($NVRDATA << 1) + $_[1]; }, # 0 accept data
89     sub { $NVRADDR = ($NVRADDR << 1) + $_[1]; }, # 1 accept addr
90     sub { ($NVRDATA <<= 1) & 0x4000 }, # 2 shift out
91     undef, # 3 not used, will barf
92     sub { $NVR[$_[0]] = $NVRDATA & 0x3fff; }, # 4 write
93     sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase
94     sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read
95     sub { }, # 7 standby
96 root 1.1 );
97    
98     my @bitidx;
99     $bitidx[1 << $_] = 9 - $_ for 0..9;
100    
101     # the nvr1400 state machine. what a monster
102     sub nvr() {
103     my $a1 = $bitidx[(~$NVRADDR ) & 0x3ff];
104     my $a0 = $bitidx[(~$NVRADDR >> 10) & 0x3ff];
105    
106     # printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA;
107    
108     $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
109     }
110    
111     #############################################################################
112    
113     my $DC11 = 0; # 4 bit commands
114     my $DC12 = 0;
115    
116     my $XON = 1; # false if terminal wants us to pause
117     my $PUSARTCMD;
118    
119     my @KXMIT; # current scan queue
120     my %KXMIT; # currently pressed keys
121     my @KQUEUE; # key event queue
122     my $KXCNT; # count for debouncew
123     my @PUSARTRECV;
124     my $KSTATUS;
125    
126     sub out_00 { # pusartdata
127     # handle xon/xoff, but also pass it through
128     if ($_[0] == 0x13) {
129     $XON = 0;
130 root 1.3 return;#d#
131 root 1.1 } elsif ($_[0] == 0x11) {
132     $XON = 1;
133 root 1.3 return;#d#
134 root 1.1 }
135    
136     syswrite $PTY, chr $_[0];
137    
138 root 1.3 $INTPEND |= 1;
139 root 1.1 }
140    
141     sub out_01 {
142     $PUSARTCMD = shift;
143    
144     $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy
145 root 1.3 $INTPEND |= 2 if $PUSARTCMD & 0x04 && !@PUSARTRECV; # VT102, 6.5 rxrdy, needed for some reason
146 root 1.1 }
147    
148     sub out_02 { } # baudrate generator
149    
150     sub out_23 { } # unknown
151     sub out_27 { } # unknown
152     sub out_2f { } # unknown, connected to in 0f
153    
154     sub out_42 { } # brightness
155    
156     sub out_62 {
157     $NVRLATCH = shift;
158     }
159    
160     sub out_a2 { $DC11 = shift }
161     sub out_c2 { } # unknown
162     sub out_d2 { $DC12 = shift }
163    
164     sub out_82 {
165     # keyboard
166    
167     # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INSERT L1(?)
168     # CLICK STARTSCAN ONLINE LOCKED | LED1 LED2 LED3 LED4
169     $KSTATUS = $_[0];
170    
171     # start new scan unless scan in progress
172     if (($_[0] & 0x40) && !@KXMIT) {
173     # do not reply with keys in locked mode
174     # or during post (0xff),
175     # mostly to skip init and not fail POST,
176     # and to send startup keys only when terminal is ready
177     unless (($_[0] & 0x10) || ($_[0] == 0xff) || ($VT102 && $INTMASK == 0x07)) {
178     if ($KXCNT <= 0 && @KQUEUE) {
179     my $c = shift @KQUEUE;
180    
181     if ($c < 0) { # key up
182     delete $KXMIT{-$c};
183     $KXCNT = 10;
184     } elsif ($c > 0) { # key down
185     undef $KXMIT{$c};
186     $KXCNT = 10;
187     } else { # delay
188     $KXCNT = 100;
189     }
190     }
191    
192     --$KXCNT;
193     @KXMIT = sort keys %KXMIT;
194     }
195    
196     $RST |= 1;
197     }
198     }
199    
200     #############################################################################
201    
202     my $NVRBIT;
203     my $LBA;
204    
205     sub in_00 { # pusart data
206 root 1.3 # interrupt not generated here, because infinite
207     # speed does not go well with the vt102.
208 root 1.1
209     shift @PUSARTRECV
210     }
211    
212     sub in_01 { # pusart status
213     # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY
214     0x85 + (@PUSARTRECV && 0x02)
215     }
216    
217     sub in_22 { # modem buffer(?)
218     # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
219     0x20
220     }
221    
222     sub in_0f { } # unknown, connected to out 2f
223    
224     sub in_42 { # flag buffer
225     ++$LBA;
226    
227     $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA & 0x3) == 0x2;
228    
229     # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
230    
231     my $f = 0x85 | $NVRBIT;
232    
233     $f |= 0x02 unless $AVO;
234     $f |= 0x40 if $LBA & 0x2;
235    
236     $f
237     }
238    
239     sub in_82 { # tbmt keyboard uart
240     return 0x7f unless @KXMIT;
241    
242     $RST |= 1;
243     shift @KXMIT
244     }
245    
246     sub in_03 { 0xff } # unknown, printer uart input?
247     sub in_0b { 0xff } # unknown
248     sub in_17 { 0xff } # unknown, printer status clear by reading?
249     sub in_1b { 0xff } # unknown
250    
251     #############################################################################
252    
253 root 1.3 sub sf { # set flags (ZSC - AP not implemented)
254 root 1.1 $FS = $_[0] & 0x080;
255     $FZ = ($_[0] & 0x0ff) == 0;
256     $FC = $_[0] & 0x100;
257    
258     $_[0] & 0xff
259     }
260    
261 root 1.3 sub sf_nc { # set flags except carry
262 root 1.1 $FS = $_[0] & 0x080;
263     $FZ = ($_[0] & 0x0ff) == 0;
264    
265     $_[0] & 0xff
266     }
267    
268     my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0 .. 255;
269     my @ops;
270    
271     my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A);
272     my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity
273    
274     # mov r,r / r,M / M,r
275     for my $s (0..7) {
276     for my $d (0..7) {
277     $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]";
278     }
279     }
280    
281     $op[0x00] = '';
282    
283     $op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
284     $op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
285     $op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
286     $op[0x31] = '$SP = IMM16' ; # lxi #d# 0xf000 because of limited stack
287    
288     $op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
289     $op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
290     $op[0x32] = '$M[IMM16 ] = $A'; # sta
291    
292     sub inxdcx($$$) {
293     $x = ($_[0] * 256 + $_[1] + $_[2]) & 0xffff;
294     $_[0] = $x >> 8;
295     $_[1] = $x & 0xff;
296     }
297    
298     $op[0x03] = 'inxdcx $B, $C, 1'; # inx
299     $op[0x13] = 'inxdcx $D, $E, 1'; # inx
300     $op[0x23] = 'inxdcx $H, $L, 1'; # inx
301     $op[0x33] = '$SP++' ; # inx
302     $op[0x0b] = 'inxdcx $B, $C, -1'; # dcx
303     $op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
304     $op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
305     $op[0x3b] = '--$SP' ; # dcx
306    
307     # "no carry" doesn't seem to be needed for vt100 - optimize?
308     $op[0x04 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] + 1" for 0..7; # inr
309     $op[0x05 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] - 1" for 0..7; # dcr
310    
311     # mvi r / M
312     $op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
313    
314     # getting this insn wrong (its the only 16 bit insn to modify flags)
315     # wasted three of my best days with mindless vt102 rom reverse engineering
316     sub dad {
317     $x = $H * 256 + $L + $_[0];
318    
319     ($H, $L) = (($x >> 8) & 0xff, $x & 0xff);
320     $FC = $x > 0xffff;
321     }
322    
323     $op[0x09] = 'dad $B * 256 + $C'; # dad
324     $op[0x19] = 'dad $D * 256 + $E'; # dad
325     $op[0x29] = 'dad $H * 256 + $L'; # dad
326     $op[0x39] = 'dad $SP '; # dad
327    
328     $op[0x07] = ' $FC = $A >> 7; $A = ($A * 2 + $FC) & 0xff '; # rlc
329     $op[0x17] = ' ($FC, $A) = ($A >> 7, ($A * 2 + $FC) & 0xff)'; # ral
330    
331     $op[0x0f] = ' $FC = $A & 1; $A = ($A >> 1) | ($FC && 0x80) '; # rrc
332     $op[0x1f] = ' ($FC, $A) = ($A & 1, ($A >> 1) | ($FC && 0x80))'; # rar
333    
334     $op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b
335     $op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d
336     $op[0x3a] = '$A = $M[IMM16]'; # lda
337    
338     $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete)
339     $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete)
340    
341     $op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld
342     $op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld
343    
344     # yeah, the fucking setup screens actually use daa...
345     $op[0x27] = '
346     my ($h, $l);
347    
348     ($h, $l) = ($A >> 4, $A & 15);
349    
350     if ($l > 9 || $FA) {
351     $A = sf $A + 6;
352     ($h, $l) = ($A >> 4, $A & 15);
353     }
354    
355     if ($h > 9 || $FC) {
356     $h += 6;
357     $A = ($h * 16 + $l) & 0xff;
358     }
359     '; # daa, almost certainly borked, also, acarry not set by sf
360    
361     $op[0x2f] = '$A ^= 0xff'; # cma
362    
363     $op[0x37] = '$FC = 1 '; # stc
364     $op[0x3f] = '$FC = !$FC'; # cmc
365    
366     $op[0x76] = 'die "HLT"'; # hlt
367    
368     $op[0x80 + $_] = '$A = sf $A + ' . $reg[$_] for 0..7; # add
369     $op[0x88 + $_] = '$A = sf $A + $FC + ' . $reg[$_] for 0..7; # adc
370     $op[0x90 + $_] = '$A = sf $A - ' . $reg[$_] for 0..7; # sub
371     $op[0x98 + $_] = '$A = sf $A - $FC - ' . $reg[$_] for 0..7; # sbb
372     $op[0xa0 + $_] = '$A = sf $A & ' . $reg[$_] for 0..7; # ana
373     $op[0xa8 + $_] = '$A = sf $A ^ ' . $reg[$_] for 0..7; # xra
374     $op[0xb0 + $_] = '$A = sf $A | ' . $reg[$_] for 0..7; # ora
375     $op[0xb8 + $_] = ' sf $A - ' . $reg[$_] for 0..7; # cmp
376     # possible todo: optimize ora a, maybe xra a
377    
378     $op[0xc6 + $_] = '$A = sf $A + IMM8'; # adi
379     $op[0xd6 + $_] = '$A = sf $A - IMM8'; # sui
380     $op[0xe6 + $_] = '$A = sf $A & IMM8'; # ani
381     $op[0xee + $_] = '$A = sf $A ^ IMM8'; # xri
382     $op[0xf6 + $_] = '$A = sf $A | IMM8'; # ori
383     $op[0xfe + $_] = ' sf $A - IMM8'; # cpi
384    
385     $op[0xc1] = '($C, $B) = (POP, POP)'; # pop
386     $op[0xd1] = '($E, $D) = (POP, POP)'; # pop
387     $op[0xe1] = '($L, $H) = (POP, POP)'; # pop
388     $op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = (!!($x & 0x80), !!($x & 0x40), !!($x & 0x10), !!($x & 0x04), !!($x & 0x01))'; # pop psw
389    
390     $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
391    
392     $op[0xc2 + $_ * 8] = 'BRA IMM16 ' . $cc[$_] for 0..7; # jcc
393     $op[0xc3] = 'JMP IMM16'; # jmp
394    
395     $op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) ' . $cc[$_] for 0..7; # ccc
396     $op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
397    
398     $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
399    
400     $op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 ' . $cc[$_] for 0..7; # rcc
401     $op[0xc9] = 'JMP POP + POP * 256'; # ret
402    
403     $op[0xc5] = 'PUSH $B; PUSH $C';
404     $op[0xd5] = 'PUSH $D; PUSH $E';
405     $op[0xe5] = 'PUSH $H; PUSH $L';
406     $op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
407    
408     $op[0xd3] = 'OUT'; # out
409     $op[0xdb] = 'IN'; # in
410    
411     # e3 xthl @ 917b, hl <-> (sp)
412    
413     $op[0xe9] = 'JMP $H * 256 + $L'; # pchl
414    
415     $op[0xf3] = '$IFF = 0'; # DI
416     $op[0xfb] = '$IFF = 1'; # EI
417    
418     @ops = @op; # for debugging #d#
419    
420     #############################################################################
421    
422     # print cpu status, for debugging
423     sub status {
424     my $PC = shift || $PC;
425    
426     printf "%04x/%04x A=%02x BC=%02x:%02x DE=%02x:%02x HL=%02x:%02x ZSCAP=%s: %02x %s\n",
427     $PC, $SP,
428     $A, $B, $C, $D, $E, $H, $L,
429     ($FZ ? "1" : "0")
430     . ($FS ? "1" : "0")
431     . ($FC ? "1" : "0")
432     . ($FA ? "1" : "0")
433     . ($FP ? "1" : "0"),
434     $M[$PC], $ops[$M[$PC]];
435     }
436    
437     #############################################################################
438    
439     my @chr = (
440 root 1.5 " " , "\x{29eb}", "\x{2592}", "\x{2409}",
441     "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}",
442     "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}",
443     "\x{2510}", "\x{250c}", "\x{2514}", "\x{253c}",
444     "\x{23ba}", "\x{23bb}", "\x{2500}", "\x{23bc}",
445     "\x{23bd}", "\x{251c}", "\x{2524}", "\x{2534}",
446     "\x{252c}", "\x{2502}", "\x{2264}", "\x{2265}",
447     "\x{03c0}", "\x{2260}", "\x{00a3}", "\x{00b7}",
448 root 1.1 (map chr, 0x020 .. 0x7e),
449     );
450    
451     utf8::encode $_ for @chr;
452    
453     sub prscr {
454     my $i = 0x2000;
455    
456     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;
457 root 1.5
458 root 1.1 line:
459     for my $y (0 .. 25) {
460     $scr .= sprintf "%2d |", ++$y;
461    
462     for (0..140) {
463     my $c = $M[$i++];
464    
465     # printf "%04x %02x\n", $i-1,$c;
466    
467     if ($c == 0x7f) { # also 0xff, but the firmware avoids that
468     $scr .= "|\x1b[K\n";
469    
470     my $a1 = $M[$i++];
471     my $a0 = $M[$i++];
472    
473     $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
474    
475     next line;
476     }
477    
478     $scr .= "\x1b[7m" if $c & 0x80;
479     $scr .= $chr[$c & 0x7f] // sprintf "[%02x]", $c & 0x7f;
480     $scr .= "\x1b[m" if $c & 0x80;
481     }
482    
483     $scr .= "\x1b[K\noverflow\x1b[K\n";
484     last;
485     }
486    
487     if (0) {
488     $scr .= "\x1b[K\n";
489     for my $o (0x200 .. 0x232) {
490     $scr .= sprintf "%04x:", $o * 16;
491     for (0..15) {
492     $scr .= sprintf " %02x", $M[$o * 16 + $_];
493     }
494     $scr .= "\x1b[K\n";
495     }
496     }
497    
498     $scr .= "\x1b[J";
499    
500     syswrite STDOUT, $scr;
501     }
502    
503     #############################################################################
504    
505     if (@ARGV) {
506     require IO::Pty;
507     $PTY = IO::Pty->new;
508    
509     my $slave = $PTY->slave;
510    
511 root 1.3 $PTY->set_winsize (24, 80);
512    
513 root 1.1 unless (fork) {
514     $ENV{TERM} = $VT102 ? "vt102" : "vt100";
515    
516     close $PTY;
517    
518     open STDIN , "<&", $slave;
519     open STDOUT, ">&", $slave;
520     open STDERR, ">&", $slave;
521    
522 root 1.3 system "stty ixoff erase ^H";
523    
524     $PTY->make_slave_controlling_terminal;
525     $PTY->close_slave;
526 root 1.1
527     exec @ARGV;
528     }
529    
530 root 1.3 $PTY->close_slave;
531    
532 root 1.1 } else {
533     open $PTY, "</dev/null" or die;#d
534     }
535    
536     #############################################################################
537    
538     # initial key input, to set up online mode etc.
539     @KQUEUE = (
540     0x7b, -0x7b, # setup
541     0, # delay
542     0x28, -0x28, # 4, toggle local/online
543     0x38, -0x38, # 5, setup b
544     0, # delay
545     (0x10, -0x10) x 2, # cursor right
546     0x37, -0x37, # 6 toggle soft scroll
547     (0x10, -0x10) x 1, # cursor right
548     0x37, -0x37, # 6 toggle autorepeat off
549     (0x10, -0x10) x 8, # cursor right
550     0x37, -0x37, # 6 toggle keyclick
551     (0x10, -0x10) x 1, # cursor right
552     $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
553     (0x10, -0x10) x 7, # cursor right
554     0x37, -0x37, # 6 toggle wrap around
555     0x7b, -0x7b, # leave setup
556     );
557    
558     #############################################################################
559    
560     # 0x80 shift, 0x100 ctrl, 0x200 toggle
561     my %KEYMAP = (
562     "\t" => 0x3a,
563     "\r" => 0x64,
564     "\n" => 0x44,
565    
566     # hardcoded rxvt keys
567     "\e" => 0x2a, # ESC
568     "\e[3~" => 0x03, # DC
569     "\e[5~" => 0x7e, # CAPS LOCK (prior)
570     "\e[6~" => 0x6a, # NO SCROLL (next)
571     "\e[A" => 0x30, # UP
572     "\e[B" => 0x22, # DOWN
573     "\e[C" => 0x10, # RIGHT
574     "\e[D" => 0x20, # LEFT
575     "\e[a" => 0x30 | 0x080, # UP
576     "\e[b" => 0x22 | 0x080, # DOWN
577     "\e[c" => 0x10 | 0x080, # RIGHT
578     "\e[d" => 0x20 | 0x080, # LEFT
579     "\e[7~" => 0x7b, # SETUP (home)
580     "\e[8~" => 0x23, # BREAK (end)
581     "\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end)
582     "\x7f" => 0x33, # BACKSPACE
583    
584     "\e[11~" => 0x32, # F1
585     "\e[11~" => 0x42, # F2
586     "\e[11~" => 0x31, # F3
587     "\e[11~" => 0x41, # F4
588     );
589    
590     @KEYMAP{map chr, 0x20..0x40} = unpack "C*", pack "H*",
591     "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9";
592    
593     @KEYMAP{map chr, 0x5b .. 0x7e} = unpack "C*", pack "H*",
594     "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4";
595    
596     $KEYMAP{"\x3f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
597     $KEYMAP{uc $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
598    
599     my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
600     $KEYMATCH = qr{^($KEYMATCH)}s;
601    
602     sub key {
603     my ($key) = @_;
604    
605     state %MOD;
606    
607     push @KQUEUE, -0x7c if !($key & 0x100) && delete $MOD{0x7c}; # ctrl-up
608     push @KQUEUE, -0x7d if !($key & 0x080) && delete $MOD{0x7d}; # shift-up
609    
610     push @KQUEUE, 0x7c if $key & 0x100 && !$MOD{0x7c}++; # ctrl-down
611     push @KQUEUE, 0x7d if $key & 0x080 && !$MOD{0x7d}++; # shift-down
612    
613     $key &= 0x7f;
614     push @KQUEUE, $key, -$key;
615     }
616    
617     my $STDIN_BUF;
618    
619     sub stdin_parse {
620     key $KEYMAP{$1}
621     while $STDIN_BUF =~ s/$KEYMATCH//;
622    
623     # skip input we can't decipher
624     substr $STDIN_BUF, 0, 1, "";
625     }
626    
627     if ($KBD) {
628     system "stty -icanon -icrnl -inlcr -echo min 1 time 0";
629     eval q{ sub END { system "stty sane" } };
630     $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 };
631     }
632    
633     #############################################################################
634    
635     my @ICACHE; # compiled instruction cache
636    
637     # the cpu
638     while () {
639    
640     # execute extended basic blocks
641     $PC = ($ICACHE[$PC] ||= do {
642     my $pc = $PC;
643    
644     my $insn = "";
645    
646     # the jit compiler
647     for (0..15) {
648    
649     # optional tracing support
650     if (0) {
651     $insn .= qq<
652     if (\$PRSTATUS) {
653     status $pc;
654     die unless --\$PRSTATUS;
655     }
656     >;
657     }
658    
659     my $imm;
660     my $op = $op[$M[$pc++]];
661    
662     for ($op) {
663     s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
664     s/\bPOP\b/\$M[\$SP++]/g; # pop byte from stack
665    
666     s/\bIMM16\b/$imm \/\/= $M[$pc++] + $M[$pc++] * 256/xge; # 16 bit insn immediate
667     s/\bIMM8\b /$imm \/\/= $M[$pc++] /xge; # 8 bit insn immediate
668    
669     s/\bPC\b/$pc/ge; # PC at end of insn
670     s/\bBRA\b/return/g; # conditional jump
671     s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump
672    
673     s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge;
674     s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge;
675     }
676    
677     $insn .= "$op;\n";
678     }
679    
680    
681     $insn .= "$pc";
682     $insn =~ s/\x00.*$//s;
683    
684     eval "use integer; sub { $insn }" or die "$insn: $@"
685     })->();
686    
687     ++$CLK;
688    
689     # things we do from time too time only
690     unless ($CLK & 0xf) {
691     # do I/O
692    
693     unless ($CLK & 0x7ff) {
694    
695     # pty/serial I/O
696     unless (@PUSARTRECV || @KQUEUE || !$PTY) {
697     my $rin = ""; (vec $rin, fileno $PTY, 1) = 1;
698    
699     if (select $rin, undef, undef, 0) {
700     sysread $PTY, my $buf, 256;
701     push @PUSARTRECV, unpack "C*", $buf;
702     }
703     }
704    
705     # keyboard input
706     if ($KBD) {
707     while (select my $rin = "\x01", undef, undef, 0) {
708     sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF
709     or last;
710     }
711    
712     stdin_parse if length $STDIN_BUF;
713     }
714     }
715    
716     # kick off various interrupts
717    
718 root 1.3 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though)
719     #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy
720 root 1.1
721 root 1.3 # kick off vertical retrace form time to time
722 root 1.5 unless ($CLK & 0x1ff) {
723 root 1.1 $RST |= 4; # vertical retrace
724     }
725    
726     # handle video hardware
727    
728     unless ($CLK & 0x1fff) {
729     prscr;
730     }
731     }
732 root 1.4
733     # the interrupt logic
734     $x = $INTPEND & ~$INTMASK;
735     if (($RST || $x) && $IFF) {
736     # rst 1 kbd data available
737     # rst 2 pusart xmit+recv flag
738     # rst 4 vertical retrace
739     # 5.5 vt125 mb7 trans ready (serial send?)
740     # 6.5 vt125 mb7 read ready (something modem?)
741     # 7.5 vt125 mb7 vblank h(?)
742     # trap vt125 mbi init h(?)
743     my $vec;
744    
745     if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1;
746     } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2;
747     } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4;
748     # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # for some reason, this breaks vt102
749     } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
750     } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
751     } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
752     } else {
753     die;
754     }
755    
756     $M[--$SP] = $PC >> 8;
757     $M[--$SP] = $PC & 0xff;
758     $PC = $vec;
759    
760     $IFF = 0;
761     }
762 root 1.1 }
763    
764     __DATA__
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