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21 | #use common::sense; |
21 | #use common::sense; |
22 | |
22 | |
23 | my $VT102 = 1; |
23 | my $VT102 = 1; |
24 | my $VT131 = 0; |
24 | my $VT131 = 0; |
25 | my $AVO = 1; |
25 | my $AVO = 1; |
26 | my $KBD = 1; |
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27 | |
26 | |
28 | shift, ($VT102 = 0), ($AVO = 0) if $ARGV[0] =~ /^-?-vt100$/; |
27 | shift, ($VT102 = 0), ($AVO = 0) if $ARGV[0] =~ /^-?-vt100$/; |
29 | shift, ($VT102 = 0) if $ARGV[0] =~ /^-?-vt100\+avo$/; |
28 | shift, ($VT102 = 0) if $ARGV[0] =~ /^-?-vt100\+avo$/; |
30 | shift if $ARGV[0] =~ /^-?-vt102$/; |
29 | shift if $ARGV[0] =~ /^-?-vt102$/; |
31 | shift, ($VT131 = 1) if $ARGV[0] =~ /^-?-vt131$/; |
30 | shift, ($VT131 = 1) if $ARGV[0] =~ /^-?-vt131$/; |
32 | |
31 | |
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32 | # vt100 wps = word processing roms |
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33 | # vt101 = vt102 - avo, but custom rom? really? |
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34 | # vt103 = vt100 + tu58 tape drive |
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35 | # vt125 = vt100 + gpo graphics processor |
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36 | # vt132 = vt100 + avo, stp |
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37 | # vt180 = vt100 + z80 cp/m |
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38 | |
33 | if ($ARGV[0] =~ /^-/) { |
39 | if ($ARGV[0] =~ /^-/) { |
34 | die <<EOF; |
40 | die <<EOF; |
35 | |
41 | |
36 | VT102, A VT100/101/102/131 SIMULATOR |
42 | VT102, A VT100/102/131 SIMULATOR |
37 | |
43 | |
38 | Usage: |
44 | Usage: |
39 | |
45 | |
40 | $0 [option] [program [args]] |
46 | $0 [option] [program [args]] |
41 | |
47 | |
… | |
… | |
73 | } |
79 | } |
74 | |
80 | |
75 | ############################################################################# |
81 | ############################################################################# |
76 | # ROM/hardware init |
82 | # ROM/hardware init |
77 | |
83 | |
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84 | my $PTY; # the pty we allocated, if any |
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85 | my $KBD = 1; |
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86 | |
78 | my $ROMS = do { |
87 | my $ROMS = do { |
79 | binmode DATA; |
88 | binmode DATA; |
80 | local $/; |
89 | local $/; |
81 | <DATA> |
90 | <DATA> |
82 | }; |
91 | }; |
83 | |
92 | |
84 | 0x6801 == length $ROMS or die "corrupted rom image"; |
93 | 0x6801 == length $ROMS or die "corrupted rom image"; |
85 | |
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86 | binmode STDOUT; |
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87 | |
94 | |
88 | my @M = (0xff) x 65536; # main memory, = (0xff) x 65536; |
95 | my @M = (0xff) x 65536; # main memory, = (0xff) x 65536; |
89 | |
96 | |
90 | # populate mem with rom contents |
97 | # populate mem with rom contents |
91 | if ($VT102) { |
98 | if ($VT102) { |
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… | |
97 | } |
104 | } |
98 | |
105 | |
99 | ############################################################################# |
106 | ############################################################################# |
100 | # 8085 CPU registers and I/O support |
107 | # 8085 CPU registers and I/O support |
101 | |
108 | |
102 | my $PTY; # the pty we allocated, if any |
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103 | |
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104 | # 8080/8085 registers |
109 | # 8080/8085 registers |
105 | # b, c, d, e, h, l, a |
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106 | my ($A, $B, $C, $D, $E, $H, $L, $A); |
110 | my ($A, $B, $C, $D, $E, $H, $L); |
107 | my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC); |
111 | my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC); |
108 | |
112 | |
109 | my $RST = 0; # 8080 pending interrupts |
113 | my $RST = 0; # 8080 pending interrupts |
110 | my $INTMASK = 7; # 8085 half interrupts |
114 | my $INTMASK = 7; # 8085 half interrupts |
111 | my $INTPEND = 0; # 8085 half interrupts |
115 | my $INTPEND = 0; # 8085 half interrupts |
112 | |
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113 | my $x; # dummy temp for instructions |
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114 | |
116 | |
115 | my $CLK; # rather inexact clock |
117 | my $CLK; # rather inexact clock |
116 | |
118 | |
117 | ############################################################################# |
119 | ############################################################################# |
118 | # the dreaded NVR1400 chip. not needed to get it going, but provided anyway |
120 | # the dreaded NVR1400 chip. not needed to get it going, but provided anyway |
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132 | sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase |
134 | sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase |
133 | sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read |
135 | sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read |
134 | sub { }, # 7 standby |
136 | sub { }, # 7 standby |
135 | ); |
137 | ); |
136 | |
138 | |
137 | my @bitidx; |
139 | my @NVR_BITIDX; |
138 | $bitidx[1 << $_] = 9 - $_ for 0..9; |
140 | $NVR_BITIDX[1 << $_] = 9 - $_ for 0..9; |
139 | |
141 | |
140 | # the nvr1400 state machine. what a monster |
142 | # the nvr1400 state machine. what a monster |
141 | sub nvr() { |
143 | sub nvr() { |
142 | my $a1 = $bitidx[(~$NVRADDR ) & 0x3ff]; |
144 | my $a1 = $NVR_BITIDX[(~$NVRADDR ) & 0x3ff]; |
143 | my $a0 = $bitidx[(~$NVRADDR >> 10) & 0x3ff]; |
145 | my $a0 = $NVR_BITIDX[(~$NVRADDR >> 10) & 0x3ff]; |
144 | |
146 | |
145 | # printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA; |
147 | # printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA; |
146 | |
148 | |
147 | $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1) |
149 | $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1) |
148 | } |
150 | } |
… | |
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295 | sub in_1b { 0xff } # vt102 unknown |
297 | sub in_1b { 0xff } # vt102 unknown |
296 | |
298 | |
297 | ############################################################################# |
299 | ############################################################################# |
298 | # 8085 cpu opcodes and flag handling |
300 | # 8085 cpu opcodes and flag handling |
299 | |
301 | |
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302 | my $x; # dummy scratchpad for opcodes |
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303 | |
300 | sub sf { # set flags (ZSC - AP not implemented) |
304 | sub sf { # set flags (ZSC - AP not implemented) |
301 | $FS = $_[0] & 0x080; |
305 | $FS = $_[0] & 0x080; |
302 | $FZ = !($_[0] & 0x0ff); |
306 | $FZ = !($_[0] & 0x0ff); |
303 | $FC = $_[0] & 0x100; |
307 | $FC = $_[0] & 0x100; |
304 | |
308 | |
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402 | $op[0xb0 + $_] = 'sf8 $A |= ' . $reg[$_] for 0..7; # ora |
406 | $op[0xb0 + $_] = 'sf8 $A |= ' . $reg[$_] for 0..7; # ora |
403 | $op[0xb8 + $_] = 'sf $x = $A - ' . $reg[$_] for 0..7; # cmp |
407 | $op[0xb8 + $_] = 'sf $x = $A - ' . $reg[$_] for 0..7; # cmp |
404 | # possible todo: optimize ora a, maybe xra a |
408 | # possible todo: optimize ora a, maybe xra a |
405 | |
409 | |
406 | $op[0xc6] = 'sf $A += IMM8'; # adi |
410 | $op[0xc6] = 'sf $A += IMM8'; # adi |
407 | # ce ADI NYI |
411 | # ce ACI NYI, apparently unused |
408 | $op[0xd6] = 'sf $A -= IMM8'; # sui |
412 | $op[0xd6] = 'sf $A -= IMM8'; # sui |
409 | # de SBI NYI |
413 | # de SBI NYI, apparently unused |
410 | $op[0xe6] = 'sf8 $A &= IMM8'; # ani |
414 | $op[0xe6] = 'sf8 $A &= IMM8'; # ani |
411 | $op[0xee] = 'sf8 $A ^= IMM8'; # xri |
415 | $op[0xee] = 'sf8 $A ^= IMM8'; # xri |
412 | $op[0xf6] = 'sf8 $A |= IMM8'; # ori |
416 | $op[0xf6] = 'sf8 $A |= IMM8'; # ori |
413 | $op[0xfe] = 'sf $A - IMM8'; # cpi |
417 | $op[0xfe] = 'sf $A - IMM8'; # cpi |
414 | |
418 | |
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432 | $op[0xc9] = 'JMP POP + POP * 256'; # ret |
436 | $op[0xc9] = 'JMP POP + POP * 256'; # ret |
433 | |
437 | |
434 | $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst |
438 | $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst |
435 | |
439 | |
436 | $op[0xe9] = 'JMP $H * 256 + $L'; # pchl |
440 | $op[0xe9] = 'JMP $H * 256 + $L'; # pchl |
437 | # f9 SPHL NYI |
441 | # f9 SPHL NYI, apparently unused |
438 | |
442 | |
439 | $op[0x37] = '$FC = 1 '; # stc |
443 | $op[0x37] = '$FC = 1 '; # stc |
440 | $op[0x3f] = '$FC = !$FC'; # cmc |
444 | $op[0x3f] = '$FC = !$FC'; # cmc |
441 | |
445 | |
442 | $op[0xd3] = 'OUT'; # out |
446 | $op[0xd3] = 'OUT'; # out |
443 | $op[0xdb] = 'IN'; # in |
447 | $op[0xdb] = 'IN'; # in |
444 | |
448 | |
445 | $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg |
449 | $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg |
446 | |
450 | |
447 | # e3 xthl NYI # @ 917b, hl <-> (sp) |
451 | # e3 xthl NYI # @ 917b in e69, hl <-> (sp) |
448 | |
452 | |
449 | $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete) |
453 | $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete) |
450 | $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete) |
454 | $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete) |
451 | |
455 | |
452 | $op[0xf3] = '$IFF = 0'; # DI |
456 | $op[0xf3] = '$IFF = 0'; # DI |
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487 | $M[$PC], $op[$M[$PC]]; |
491 | $M[$PC], $op[$M[$PC]]; |
488 | } |
492 | } |
489 | |
493 | |
490 | ############################################################################# |
494 | ############################################################################# |
491 | # video emulation |
495 | # video emulation |
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496 | |
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497 | binmode STDOUT; |
492 | |
498 | |
493 | my @CHARMAP = ( |
499 | my @CHARMAP = ( |
494 | " " , "\x{29eb}", "\x{2592}", "\x{2409}", |
500 | " " , "\x{29eb}", "\x{2592}", "\x{2409}", |
495 | "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}", |
501 | "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}", |
496 | "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}", |
502 | "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}", |
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747 | eval "use integer; sub { $insn }" or die "$insn: $@" |
753 | eval "use integer; sub { $insn }" or die "$insn: $@" |
748 | })->(); |
754 | })->(); |
749 | |
755 | |
750 | ++$CLK; |
756 | ++$CLK; |
751 | |
757 | |
752 | # things we do from time too time only |
758 | # things we do from time to time only |
753 | unless ($CLK & 0xf) { |
759 | unless ($CLK & 0xf) { |
754 | # do I/O |
760 | # do I/O |
755 | |
761 | |
756 | unless ($CLK & 0xfff) { |
762 | unless ($CLK & 0xfff) { |
757 | |
763 | |
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801 | # 6.5 vt125 mb7 read ready (something modem?) |
807 | # 6.5 vt125 mb7 read ready (something modem?) |
802 | # 7.5 vt125 mb7 vblank h(?) |
808 | # 7.5 vt125 mb7 vblank h(?) |
803 | # trap vt125 mbi init h(?) |
809 | # trap vt125 mbi init h(?) |
804 | my $vec; |
810 | my $vec; |
805 | |
811 | |
806 | $x = $INTPEND & ~$INTMASK; |
812 | my $pend = $INTPEND & ~$INTMASK; |
807 | |
813 | |
808 | if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1; |
814 | if ($pend & 1) { $vec = 0x2c; $INTPEND &= ~1; |
809 | } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2; |
815 | } elsif ($pend & 2) { $vec = 0x34; $INTPEND &= ~2; |
810 | } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4; |
816 | } elsif ($pend & 4) { $vec = 0x3c; $INTPEND &= ~4; |
811 | # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # the vt102 firmware doesn't like combined interrupts |
817 | # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # the vt102 firmware doesn't like combined interrupts |
812 | } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102 |
818 | } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102 |
813 | } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2; |
819 | } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2; |
814 | } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4; |
820 | } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4; |
815 | } else { |
821 | } else { |