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#!/opt/bin/perl |
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|
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# |
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# Copyright(C) 2014 Marc Alexander Lehmann <vt102@schmorp.de> |
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# |
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# vt102 is free software; you can redistribute it and/or modify it under |
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# the terms of the GNU General Public License as published by the Free |
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# Software Foundation; either version 3, or (at your option) any later |
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# version. |
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# |
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# vt102 is distributed in the hope that it will be useful, but WITHOUT |
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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# for more details. |
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# |
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|
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# If this file contains embedded ROMs, the above copyright notice does |
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# not apply to them. |
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|
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# this hack is not considered release ready in and way, shape, or form |
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# ./vt102 bash |
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# ./vt102 telnet towel.blinkenlights.nl |
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# ./vt102 curl http://artscene.textfiles.com/vt100/trekvid.vt |
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# ./vt102 curl http://artscene.textfiles.com/vt100/surf.vt # in 3d! |
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|
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# TODO: ctrl |
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|
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use common::sense; |
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|
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$| = 1; |
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|
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my $VT102 = 1; |
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my $AVO = $VT102 || 1; |
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my $KBD = 1; |
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|
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############################################################################# |
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# rom initialising |
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|
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my $ROM = do { |
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binmode DATA; |
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local $/; |
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<DATA> |
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}; |
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|
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0x6001 == length $ROM or die "corrupted rom image"; |
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|
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binmode STDOUT; |
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|
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my @M = (0xff) x 65536; # main memory, = (0xff) x 65536; |
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|
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# populate mem with rom contents |
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if ($VT102) { |
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@M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x2000, 0x2000; |
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@M[0x8000 .. 0x9fff] = unpack "C*", substr $ROM, 0x4000, 0x2000; |
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} else { |
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@M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x0000, 0x2000; |
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} |
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|
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############################################################################# |
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# cpu registers and I/O support |
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|
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my $PTY; # the pty we allocated, if any |
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my $PRSTATUS = 0; |
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|
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# 8080/8085 registers |
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# b, c, d, e, h, l, a |
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my ($A, $B, $C, $D, $E, $H, $L, $A); |
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my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC); |
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|
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my $RST = 0; # 8080 pending interrupts |
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my $INTMASK = 7; # 8085 half interrupts |
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my $INTPEND = 0; # 8085 half interrupts |
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|
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my $x; # dummy temp for instructions |
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|
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my $CLK; # rather inexact clock |
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|
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############################################################################# |
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# the dreaded nvr1400 chip. not needed to get it going, but provided for reference |
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|
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# nvram |
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my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes |
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my $NVRADDR; |
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my $NVRDATA; |
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my $NVRLATCH; |
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|
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my @NVRCMD = ( |
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sub { $NVRDATA = ($NVRDATA << 1) + $_[1]; }, # 0 accept data |
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sub { $NVRADDR = ($NVRADDR << 1) + $_[1]; }, # 1 accept addr |
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sub { ($NVRDATA <<= 1) & 0x4000 }, # 2 shift out |
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undef, # 3 not used, will barf |
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sub { $NVR[$_[0]] = $NVRDATA & 0x3fff; }, # 4 write |
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sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase |
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sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read |
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sub { }, # 7 standby |
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); |
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|
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my @bitidx; |
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$bitidx[1 << $_] = 9 - $_ for 0..9; |
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|
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# the nvr1400 state machine. what a monster |
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sub nvr() { |
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my $a1 = $bitidx[(~$NVRADDR ) & 0x3ff]; |
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my $a0 = $bitidx[(~$NVRADDR >> 10) & 0x3ff]; |
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|
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# printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA; |
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|
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$NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1) |
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} |
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|
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############################################################################# |
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|
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my $DC11_REVERSE = 0; |
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|
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my $XON = 1; # false if terminal wants us to pause |
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my $PUSARTCMD; |
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|
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my @KXMIT; # current scan queue |
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my %KXMIT; # currently pressed keys |
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my @KQUEUE; # key event queue |
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my $KXCNT; # count for debouncew |
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my @PUSARTRECV; |
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my $KSTATUS; |
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|
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sub out_00 { # pusartdata |
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# handle xon/xoff, but also pass it through |
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if ($_[0] == 0x13) { |
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$XON = 0; |
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return;#d# |
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} elsif ($_[0] == 0x11) { |
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$XON = 1; |
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return;#d# |
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} |
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|
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syswrite $PTY, chr $_[0]; |
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|
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$INTPEND |= 1; |
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} |
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|
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sub out_01 { |
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$PUSARTCMD = shift; |
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|
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$INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy |
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$INTPEND |= 2 if $PUSARTCMD & 0x04 && !@PUSARTRECV; # VT102, 6.5 rxrdy, needed for some reason |
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} |
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|
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sub out_02 { } # baudrate generator |
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|
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sub out_23 { } # unknown |
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sub out_27 { } # unknown |
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sub out_2f { } # unknown, connected to in 0f |
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|
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sub out_42 { } # brightness |
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|
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sub out_62 { |
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$NVRLATCH = shift; |
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} |
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|
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sub out_a2 { |
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my $dc11 = 0x0f & shift; |
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|
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$DC11_REVERSE = 1 if $dc11 == 0b1010; |
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$DC11_REVERSE = 0 if $dc11 == 0b1011; |
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} |
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|
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sub out_c2 { } # unknown |
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sub out_d2 { } # 0..3 == 80c/132c/60hz/50hz |
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|
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sub out_82 { |
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# keyboard |
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|
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# CLICK STARTSCAN ONLINE LOCKED | CTS DSR INSERT L1(?) |
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# CLICK STARTSCAN ONLINE LOCKED | LED1 LED2 LED3 LED4 |
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$KSTATUS = $_[0]; |
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|
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# start new scan unless scan in progress |
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if (($_[0] & 0x40) && !@KXMIT) { |
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# do not reply with keys in locked mode |
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# or during post (0xff), |
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# mostly to skip init and not fail POST, |
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# and to send startup keys only when terminal is ready |
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unless (($_[0] & 0x10) || ($_[0] == 0xff) || ($VT102 && $INTMASK == 0x07)) { |
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if ($KXCNT <= 0 && @KQUEUE) { |
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my $c = shift @KQUEUE; |
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|
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if ($c < 0) { # key up |
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delete $KXMIT{-$c}; |
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$KXCNT = 10; |
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} elsif ($c > 0) { # key down |
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undef $KXMIT{$c}; |
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$KXCNT = 10; |
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} else { # delay |
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$KXCNT = 100; |
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} |
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} |
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|
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--$KXCNT; |
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@KXMIT = sort keys %KXMIT; |
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} |
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|
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$RST |= 1; |
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} |
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} |
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|
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############################################################################# |
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|
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my $NVRBIT; |
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my $LBA; |
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|
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sub in_00 { # pusart data |
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# interrupt not generated here, because infinite |
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# speed does not go well with the vt102. |
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|
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shift @PUSARTRECV |
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} |
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|
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sub in_01 { # pusart status |
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# DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY |
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0x85 + (@PUSARTRECV && 0x02) |
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} |
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|
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sub in_22 { # modem buffer(?) |
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# wild guess: -CTS -SPDI -RI -CD 0 0 0 0 |
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0x20 |
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} |
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|
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sub in_0f { } # unknown, connected to out 2f |
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|
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sub in_42 { # flag buffer |
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++$LBA; |
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|
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$NVRBIT = nvr ? 0x20 : 0x00 if ($LBA & 0x3) == 0x2; |
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|
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# KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY |
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|
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my $f = 0x85 | $NVRBIT; |
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|
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$f |= 0x02 unless $AVO; |
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$f |= 0x40 if $LBA & 0x2; |
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|
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$f |
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} |
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|
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sub in_82 { # tbmt keyboard uart |
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return 0x7f unless @KXMIT; |
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|
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$RST |= 1; |
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shift @KXMIT |
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} |
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|
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sub in_03 { 0xff } # unknown, printer uart input? |
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sub in_0b { 0xff } # unknown |
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sub in_17 { 0xff } # unknown, printer status clear by reading? |
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sub in_1b { 0xff } # unknown |
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|
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############################################################################# |
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|
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sub sf { # set flags (ZSC - AP not implemented) |
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$FS = $_[0] & 0x080; |
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$FZ = ($_[0] & 0x0ff) == 0; |
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$FC = $_[0] & 0x100; |
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|
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$_[0] & 0xff |
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} |
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|
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sub sf_nc { # set flags except carry |
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$FS = $_[0] & 0x080; |
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$FZ = ($_[0] & 0x0ff) == 0; |
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|
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$_[0] & 0xff |
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} |
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|
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my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0 .. 255; |
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my @ops; |
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|
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my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A); |
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my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity |
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|
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# mov r,r / r,M / M,r |
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for my $s (0..7) { |
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for my $d (0..7) { |
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$op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]"; |
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} |
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} |
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|
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$op[0x00] = ''; |
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|
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$op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi |
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$op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi |
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$op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi |
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$op[0x31] = '$SP = IMM16' ; # lxi #d# 0xf000 because of limited stack |
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|
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$op[0x02] = '$M[$B * 256 + $C] = $A'; # stax |
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$op[0x12] = '$M[$D * 256 + $E] = $A'; # stax |
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$op[0x32] = '$M[IMM16 ] = $A'; # sta |
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|
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sub inxdcx($$$) { |
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$x = ($_[0] * 256 + $_[1] + $_[2]) & 0xffff; |
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$_[0] = $x >> 8; |
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$_[1] = $x & 0xff; |
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} |
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|
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$op[0x03] = 'inxdcx $B, $C, 1'; # inx |
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$op[0x13] = 'inxdcx $D, $E, 1'; # inx |
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$op[0x23] = 'inxdcx $H, $L, 1'; # inx |
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$op[0x33] = '$SP++' ; # inx |
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$op[0x0b] = 'inxdcx $B, $C, -1'; # dcx |
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$op[0x1b] = 'inxdcx $D, $E, -1'; # dcx |
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$op[0x2b] = 'inxdcx $H, $L, -1'; # dcx |
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$op[0x3b] = '--$SP' ; # dcx |
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|
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# "no carry" doesn't seem to be needed for vt100 - optimize? |
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$op[0x04 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] + 1" for 0..7; # inr |
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$op[0x05 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] - 1" for 0..7; # dcr |
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|
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# mvi r / M |
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$op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7; |
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|
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# getting this insn wrong (its the only 16 bit insn to modify flags) |
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# wasted three of my best days with mindless vt102 rom reverse engineering |
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sub dad { |
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$x = $H * 256 + $L + $_[0]; |
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|
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($H, $L) = (($x >> 8) & 0xff, $x & 0xff); |
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$FC = $x > 0xffff; |
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} |
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|
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$op[0x09] = 'dad $B * 256 + $C'; # dad |
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$op[0x19] = 'dad $D * 256 + $E'; # dad |
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$op[0x29] = 'dad $H * 256 + $L'; # dad |
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$op[0x39] = 'dad $SP '; # dad |
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|
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$op[0x07] = ' $FC = $A >> 7; $A = ($A * 2 + $FC) & 0xff '; # rlc |
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$op[0x17] = ' ($FC, $A) = ($A >> 7, ($A * 2 + $FC) & 0xff)'; # ral |
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|
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$op[0x0f] = ' $FC = $A & 1; $A = ($A >> 1) | ($FC && 0x80) '; # rrc |
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$op[0x1f] = ' ($FC, $A) = ($A & 1, ($A >> 1) | ($FC && 0x80))'; # rar |
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|
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$op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b |
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$op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d |
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$op[0x3a] = '$A = $M[IMM16]'; # lda |
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|
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$op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete) |
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$op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete) |
| 345 |
|
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$op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld |
| 347 |
$op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld |
| 348 |
|
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# yeah, the fucking setup screens actually use daa... |
| 350 |
$op[0x27] = ' |
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my ($h, $l); |
| 352 |
|
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($h, $l) = ($A >> 4, $A & 15); |
| 354 |
|
| 355 |
if ($l > 9 || $FA) { |
| 356 |
$A = sf $A + 6; |
| 357 |
($h, $l) = ($A >> 4, $A & 15); |
| 358 |
} |
| 359 |
|
| 360 |
if ($h > 9 || $FC) { |
| 361 |
$h += 6; |
| 362 |
$A = ($h * 16 + $l) & 0xff; |
| 363 |
} |
| 364 |
'; # daa, almost certainly borked, also, acarry not set by sf |
| 365 |
|
| 366 |
$op[0x2f] = '$A ^= 0xff'; # cma |
| 367 |
|
| 368 |
$op[0x37] = '$FC = 1 '; # stc |
| 369 |
$op[0x3f] = '$FC = !$FC'; # cmc |
| 370 |
|
| 371 |
$op[0x76] = 'die "HLT"'; # hlt |
| 372 |
|
| 373 |
$op[0x80 + $_] = '$A = sf $A + ' . $reg[$_] for 0..7; # add |
| 374 |
$op[0x88 + $_] = '$A = sf $A + $FC + ' . $reg[$_] for 0..7; # adc |
| 375 |
$op[0x90 + $_] = '$A = sf $A - ' . $reg[$_] for 0..7; # sub |
| 376 |
$op[0x98 + $_] = '$A = sf $A - $FC - ' . $reg[$_] for 0..7; # sbb |
| 377 |
$op[0xa0 + $_] = '$A = sf $A & ' . $reg[$_] for 0..7; # ana |
| 378 |
$op[0xa8 + $_] = '$A = sf $A ^ ' . $reg[$_] for 0..7; # xra |
| 379 |
$op[0xb0 + $_] = '$A = sf $A | ' . $reg[$_] for 0..7; # ora |
| 380 |
$op[0xb8 + $_] = ' sf $A - ' . $reg[$_] for 0..7; # cmp |
| 381 |
# possible todo: optimize ora a, maybe xra a |
| 382 |
|
| 383 |
$op[0xc6 + $_] = '$A = sf $A + IMM8'; # adi |
| 384 |
$op[0xd6 + $_] = '$A = sf $A - IMM8'; # sui |
| 385 |
$op[0xe6 + $_] = '$A = sf $A & IMM8'; # ani |
| 386 |
$op[0xee + $_] = '$A = sf $A ^ IMM8'; # xri |
| 387 |
$op[0xf6 + $_] = '$A = sf $A | IMM8'; # ori |
| 388 |
$op[0xfe + $_] = ' sf $A - IMM8'; # cpi |
| 389 |
|
| 390 |
$op[0xc1] = '($C, $B) = (POP, POP)'; # pop |
| 391 |
$op[0xd1] = '($E, $D) = (POP, POP)'; # pop |
| 392 |
$op[0xe1] = '($L, $H) = (POP, POP)'; # pop |
| 393 |
$op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = (!!($x & 0x80), !!($x & 0x40), !!($x & 0x10), !!($x & 0x04), !!($x & 0x01))'; # pop psw |
| 394 |
|
| 395 |
$op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg |
| 396 |
|
| 397 |
$op[0xc2 + $_ * 8] = 'BRA IMM16 ' . $cc[$_] for 0..7; # jcc |
| 398 |
$op[0xc3] = 'JMP IMM16'; # jmp |
| 399 |
|
| 400 |
$op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) ' . $cc[$_] for 0..7; # ccc |
| 401 |
$op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call |
| 402 |
|
| 403 |
$op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst |
| 404 |
|
| 405 |
$op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 ' . $cc[$_] for 0..7; # rcc |
| 406 |
$op[0xc9] = 'JMP POP + POP * 256'; # ret |
| 407 |
|
| 408 |
$op[0xc5] = 'PUSH $B; PUSH $C'; |
| 409 |
$op[0xd5] = 'PUSH $D; PUSH $E'; |
| 410 |
$op[0xe5] = 'PUSH $H; PUSH $L'; |
| 411 |
$op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw |
| 412 |
|
| 413 |
$op[0xd3] = 'OUT'; # out |
| 414 |
$op[0xdb] = 'IN'; # in |
| 415 |
|
| 416 |
# e3 xthl @ 917b, hl <-> (sp) |
| 417 |
|
| 418 |
$op[0xe9] = 'JMP $H * 256 + $L'; # pchl |
| 419 |
|
| 420 |
$op[0xf3] = '$IFF = 0'; # DI |
| 421 |
$op[0xfb] = '$IFF = 1'; # EI |
| 422 |
|
| 423 |
@ops = @op; # for debugging #d# |
| 424 |
|
| 425 |
############################################################################# |
| 426 |
|
| 427 |
# print cpu status, for debugging |
| 428 |
sub status { |
| 429 |
my $PC = shift || $PC; |
| 430 |
|
| 431 |
printf "%04x/%04x A=%02x BC=%02x:%02x DE=%02x:%02x HL=%02x:%02x ZSCAP=%s: %02x %s\n", |
| 432 |
$PC, $SP, |
| 433 |
$A, $B, $C, $D, $E, $H, $L, |
| 434 |
($FZ ? "1" : "0") |
| 435 |
. ($FS ? "1" : "0") |
| 436 |
. ($FC ? "1" : "0") |
| 437 |
. ($FA ? "1" : "0") |
| 438 |
. ($FP ? "1" : "0"), |
| 439 |
$M[$PC], $ops[$M[$PC]]; |
| 440 |
} |
| 441 |
|
| 442 |
############################################################################# |
| 443 |
|
| 444 |
my @chr = ( |
| 445 |
" " , "\x{29eb}", "\x{2592}", "\x{2409}", |
| 446 |
"\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}", |
| 447 |
"\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}", |
| 448 |
"\x{2510}", "\x{250c}", "\x{2514}", "\x{253c}", |
| 449 |
"\x{23ba}", "\x{23bb}", "\x{2500}", "\x{23bc}", |
| 450 |
"\x{23bd}", "\x{251c}", "\x{2524}", "\x{2534}", |
| 451 |
"\x{252c}", "\x{2502}", "\x{2264}", "\x{2265}", |
| 452 |
"\x{03c0}", "\x{2260}", "\x{00a3}", "\x{00b7}", |
| 453 |
(map chr, 0x020 .. 0x7e), |
| 454 |
); |
| 455 |
|
| 456 |
utf8::encode $_ for @chr; |
| 457 |
|
| 458 |
my @sgr; # sgr sequences for attributes |
| 459 |
|
| 460 |
for (0x00 .. 0xff) { |
| 461 |
my $sgr = ""; |
| 462 |
|
| 463 |
$sgr .= ";5" unless $_ & 0x01; |
| 464 |
$sgr .= ";4" unless $_ & 0x02; |
| 465 |
$sgr .= ";1" unless $_ & 0x04; |
| 466 |
$sgr .= ";7" if $_ & 0x80; |
| 467 |
|
| 468 |
$sgr[$_] = "\e[${sgr}m"; |
| 469 |
} |
| 470 |
|
| 471 |
sub prscr { |
| 472 |
my $i = 0x2000; |
| 473 |
|
| 474 |
my $scr = sprintf "\e[H--- KBD %08b CLK %d\e[K\n", $KSTATUS, $CLK; |
| 475 |
|
| 476 |
$scr .= "\e[?5" . ($DC11_REVERSE ? "h" : "l"); |
| 477 |
|
| 478 |
line: |
| 479 |
for my $y (0 .. 25) { # ntsc, two vblank delay lines, up to 24 text lines |
| 480 |
my $prev_sgr; |
| 481 |
|
| 482 |
$scr .= sprintf "%2d |", ++$y; |
| 483 |
|
| 484 |
for (0..139) { |
| 485 |
my $c = $M[$i]; |
| 486 |
|
| 487 |
if ($c == 0x7f) { # also 0xff, but the firmware avoids that |
| 488 |
$scr .= "\e[m|\e[K\n"; |
| 489 |
|
| 490 |
my $a1 = $M[$i + 1]; |
| 491 |
my $a0 = $M[$i + 2]; |
| 492 |
|
| 493 |
$i = 0x2000 + (($a1 * 256 + $a0) & 0xfff); |
| 494 |
|
| 495 |
next line; |
| 496 |
} |
| 497 |
|
| 498 |
my $sgr = $sgr[ ($M[$i++ + 0x1000] & 15) | ($c & 0x80)]; |
| 499 |
|
| 500 |
# ~1 sgr 5 blink |
| 501 |
# ~2 sgr 4 underline |
| 502 |
# ~4 sgr 1 bold |
| 503 |
# 0x80 in attr, sgr 7, reversed |
| 504 |
|
| 505 |
$scr .= $prev_sgr = $sgr if $sgr ne $prev_sgr; |
| 506 |
|
| 507 |
$scr .= $chr[$c & 0x7f]; |
| 508 |
} |
| 509 |
|
| 510 |
$scr .= "\e[K\nvideo overflow\e[K\n"; |
| 511 |
last; |
| 512 |
} |
| 513 |
|
| 514 |
$scr .= "\e[m"; |
| 515 |
|
| 516 |
if (0) { |
| 517 |
$scr .= "\e[K\n"; |
| 518 |
for my $o (0x200 .. 0x232) { |
| 519 |
$scr .= sprintf "%04x:", $o * 16; |
| 520 |
for (0..15) { |
| 521 |
$scr .= sprintf " %02x", $M[$o * 16 + $_]; |
| 522 |
} |
| 523 |
$scr .= "\e[K\n"; |
| 524 |
} |
| 525 |
} |
| 526 |
|
| 527 |
$scr .= "\e[J"; |
| 528 |
|
| 529 |
syswrite STDOUT, $scr; |
| 530 |
} |
| 531 |
|
| 532 |
############################################################################# |
| 533 |
|
| 534 |
if (@ARGV) { |
| 535 |
require IO::Pty; |
| 536 |
$PTY = IO::Pty->new; |
| 537 |
|
| 538 |
my $slave = $PTY->slave; |
| 539 |
|
| 540 |
$PTY->set_winsize (24, 80); |
| 541 |
|
| 542 |
unless (fork) { |
| 543 |
$ENV{TERM} = $VT102 ? "vt102" : "vt100"; |
| 544 |
|
| 545 |
close $PTY; |
| 546 |
|
| 547 |
open STDIN , "<&", $slave; |
| 548 |
open STDOUT, ">&", $slave; |
| 549 |
open STDERR, ">&", $slave; |
| 550 |
|
| 551 |
system "stty ixoff erase ^H"; |
| 552 |
|
| 553 |
$PTY->make_slave_controlling_terminal; |
| 554 |
$PTY->close_slave; |
| 555 |
|
| 556 |
exec @ARGV; |
| 557 |
} |
| 558 |
|
| 559 |
$PTY->close_slave; |
| 560 |
|
| 561 |
} else { |
| 562 |
open $PTY, "</dev/null" or die;#d |
| 563 |
} |
| 564 |
|
| 565 |
############################################################################# |
| 566 |
|
| 567 |
# initial key input, to set up online mode etc. |
| 568 |
@KQUEUE = ( |
| 569 |
0x7b, -0x7b, # setup |
| 570 |
0, # delay |
| 571 |
0x28, -0x28, # 4, toggle local/online |
| 572 |
0x38, -0x38, # 5, setup b |
| 573 |
0, # delay |
| 574 |
(0x10, -0x10) x 2, # cursor right |
| 575 |
0x37, -0x37, # 6 toggle soft scroll |
| 576 |
(0x10, -0x10) x 1, # cursor right |
| 577 |
0x37, -0x37, # 6 toggle autorepeat off |
| 578 |
(0x10, -0x10) x 8, # cursor right |
| 579 |
0x37, -0x37, # 6 toggle keyclick |
| 580 |
(0x10, -0x10) x 1, # cursor right |
| 581 |
$VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52 |
| 582 |
(0x10, -0x10) x 7, # cursor right |
| 583 |
0x37, -0x37, # 6 toggle wrap around |
| 584 |
0x7b, -0x7b, # leave setup |
| 585 |
); |
| 586 |
|
| 587 |
############################################################################# |
| 588 |
|
| 589 |
# 0x80 shift, 0x100 ctrl, 0x200 toggle |
| 590 |
my %KEYMAP = ( |
| 591 |
"\t" => 0x3a, |
| 592 |
"\r" => 0x64, |
| 593 |
"\n" => 0x44, |
| 594 |
|
| 595 |
# hardcoded rxvt keys |
| 596 |
"\e" => 0x2a, # ESC |
| 597 |
"\e[3~" => 0x03, # DC |
| 598 |
"\e[5~" => 0x7e, # CAPS LOCK (prior) |
| 599 |
"\e[6~" => 0x6a, # NO SCROLL (next) |
| 600 |
"\e[A" => 0x30, # UP |
| 601 |
"\e[B" => 0x22, # DOWN |
| 602 |
"\e[C" => 0x10, # RIGHT |
| 603 |
"\e[D" => 0x20, # LEFT |
| 604 |
"\e[a" => 0x30 | 0x080, # UP |
| 605 |
"\e[b" => 0x22 | 0x080, # DOWN |
| 606 |
"\e[c" => 0x10 | 0x080, # RIGHT |
| 607 |
"\e[d" => 0x20 | 0x080, # LEFT |
| 608 |
"\e[7~" => 0x7b, # SETUP (home) |
| 609 |
"\e[8~" => 0x23, # BREAK (end) |
| 610 |
"\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end) |
| 611 |
"\x7f" => 0x33, # BACKSPACE |
| 612 |
|
| 613 |
"\e[11~" => 0x32, # F1 |
| 614 |
"\e[11~" => 0x42, # F2 |
| 615 |
"\e[11~" => 0x31, # F3 |
| 616 |
"\e[11~" => 0x41, # F4 |
| 617 |
); |
| 618 |
|
| 619 |
@KEYMAP{map chr, 0x20..0x40} = unpack "C*", pack "H*", |
| 620 |
"779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9"; |
| 621 |
|
| 622 |
@KEYMAP{map chr, 0x5b .. 0x7e} = unpack "C*", pack "H*", |
| 623 |
"154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4"; |
| 624 |
|
| 625 |
$KEYMAP{"\x3f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl |
| 626 |
$KEYMAP{uc $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift |
| 627 |
|
| 628 |
my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP; |
| 629 |
$KEYMATCH = qr{^($KEYMATCH)}s; |
| 630 |
|
| 631 |
sub key { |
| 632 |
my ($key) = @_; |
| 633 |
|
| 634 |
state %MOD; |
| 635 |
|
| 636 |
push @KQUEUE, -0x7c if !($key & 0x100) && delete $MOD{0x7c}; # ctrl-up |
| 637 |
push @KQUEUE, -0x7d if !($key & 0x080) && delete $MOD{0x7d}; # shift-up |
| 638 |
|
| 639 |
push @KQUEUE, 0x7c if $key & 0x100 && !$MOD{0x7c}++; # ctrl-down |
| 640 |
push @KQUEUE, 0x7d if $key & 0x080 && !$MOD{0x7d}++; # shift-down |
| 641 |
|
| 642 |
$key &= 0x7f; |
| 643 |
push @KQUEUE, $key, -$key; |
| 644 |
} |
| 645 |
|
| 646 |
my $STDIN_BUF; |
| 647 |
|
| 648 |
sub stdin_parse { |
| 649 |
key $KEYMAP{$1} |
| 650 |
while $STDIN_BUF =~ s/$KEYMATCH//; |
| 651 |
|
| 652 |
# skip input we can't decipher |
| 653 |
substr $STDIN_BUF, 0, 1, ""; |
| 654 |
} |
| 655 |
|
| 656 |
if ($KBD) { |
| 657 |
system "stty -icanon -icrnl -inlcr -echo min 1 time 0"; |
| 658 |
eval q{ sub END { system "stty sane" } }; |
| 659 |
$SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 }; |
| 660 |
} |
| 661 |
|
| 662 |
############################################################################# |
| 663 |
|
| 664 |
my @ICACHE; # compiled instruction cache |
| 665 |
|
| 666 |
# the cpu |
| 667 |
while () { |
| 668 |
|
| 669 |
# execute extended basic blocks |
| 670 |
$PC = ($ICACHE[$PC] ||= do { |
| 671 |
my $pc = $PC; |
| 672 |
|
| 673 |
my $insn = ""; |
| 674 |
|
| 675 |
# the jit compiler |
| 676 |
for (0..15) { |
| 677 |
|
| 678 |
# optional tracing support |
| 679 |
if (0) { |
| 680 |
$insn .= qq< |
| 681 |
if (\$PRSTATUS) { |
| 682 |
status $pc; |
| 683 |
die unless --\$PRSTATUS; |
| 684 |
} |
| 685 |
>; |
| 686 |
} |
| 687 |
|
| 688 |
my $imm; |
| 689 |
my $op = $op[$M[$pc++]]; |
| 690 |
|
| 691 |
for ($op) { |
| 692 |
s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack |
| 693 |
s/\bPOP\b/\$M[\$SP++]/g; # pop byte from stack |
| 694 |
|
| 695 |
s/\bIMM16\b/$imm \/\/= $M[$pc++] + $M[$pc++] * 256/xge; # 16 bit insn immediate |
| 696 |
s/\bIMM8\b /$imm \/\/= $M[$pc++] /xge; # 8 bit insn immediate |
| 697 |
|
| 698 |
s/\bPC\b/$pc/ge; # PC at end of insn |
| 699 |
s/\bBRA\b/return/g; # conditional jump |
| 700 |
s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump |
| 701 |
|
| 702 |
s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge; |
| 703 |
s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge; |
| 704 |
} |
| 705 |
|
| 706 |
$insn .= "$op;\n"; |
| 707 |
} |
| 708 |
|
| 709 |
|
| 710 |
$insn .= "$pc"; |
| 711 |
$insn =~ s/\x00.*$//s; |
| 712 |
|
| 713 |
eval "use integer; sub { $insn }" or die "$insn: $@" |
| 714 |
})->(); |
| 715 |
|
| 716 |
++$CLK; |
| 717 |
|
| 718 |
# things we do from time too time only |
| 719 |
unless ($CLK & 0xf) { |
| 720 |
# do I/O |
| 721 |
|
| 722 |
unless ($CLK & 0x7ff) { |
| 723 |
|
| 724 |
# pty/serial I/O |
| 725 |
unless (@PUSARTRECV || @KQUEUE || !$PTY) { |
| 726 |
my $rin = ""; (vec $rin, fileno $PTY, 1) = 1; |
| 727 |
|
| 728 |
if (select $rin, undef, undef, 0) { |
| 729 |
sysread $PTY, my $buf, 256; |
| 730 |
push @PUSARTRECV, unpack "C*", $buf; |
| 731 |
} |
| 732 |
} |
| 733 |
|
| 734 |
# keyboard input |
| 735 |
if ($KBD) { |
| 736 |
while (select my $rin = "\x01", undef, undef, 0) { |
| 737 |
sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF |
| 738 |
or last; |
| 739 |
} |
| 740 |
|
| 741 |
stdin_parse if length $STDIN_BUF; |
| 742 |
} |
| 743 |
} |
| 744 |
|
| 745 |
# kick off various interrupts |
| 746 |
|
| 747 |
$RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though) |
| 748 |
#$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy |
| 749 |
|
| 750 |
# kick off vertical retrace form time to time |
| 751 |
unless ($CLK & 0x1ff) { |
| 752 |
$RST |= 4; # vertical retrace |
| 753 |
} |
| 754 |
|
| 755 |
# handle video hardware |
| 756 |
|
| 757 |
unless ($CLK & 0x1fff) { |
| 758 |
prscr; |
| 759 |
} |
| 760 |
} |
| 761 |
|
| 762 |
# the interrupt logic |
| 763 |
$x = $INTPEND & ~$INTMASK; |
| 764 |
if (($RST || $x) && $IFF) { |
| 765 |
# rst 1 kbd data available |
| 766 |
# rst 2 pusart xmit+recv flag |
| 767 |
# rst 4 vertical retrace |
| 768 |
# 5.5 vt125 mb7 trans ready (serial send?) |
| 769 |
# 6.5 vt125 mb7 read ready (something modem?) |
| 770 |
# 7.5 vt125 mb7 vblank h(?) |
| 771 |
# trap vt125 mbi init h(?) |
| 772 |
my $vec; |
| 773 |
|
| 774 |
if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1; |
| 775 |
} elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2; |
| 776 |
} elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4; |
| 777 |
# } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # for some reason, this breaks vt102 |
| 778 |
} elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102 |
| 779 |
} elsif ($RST & 2) { $vec = 0x10; $RST &= ~2; |
| 780 |
} elsif ($RST & 4) { $vec = 0x20; $RST &= ~4; |
| 781 |
} else { |
| 782 |
die; |
| 783 |
} |
| 784 |
|
| 785 |
$M[--$SP] = $PC >> 8; |
| 786 |
$M[--$SP] = $PC & 0xff; |
| 787 |
$PC = $vec; |
| 788 |
|
| 789 |
$IFF = 0; |
| 790 |
} |
| 791 |
} |
| 792 |
|
| 793 |
__DATA__ |
| 794 |
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