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use Data::Dump qw/dump/; |
use Data::Dump qw/dump/; |
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use Carp qw/confess/; |
use Carp qw/confess/; |
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use Exporter 'import'; |
use Exporter 'import'; |
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our @EXPORT = qw'@mem $PC $A $P $X $Y $S $IPeriod $run_for $debug'; |
our @EXPORT = qw'@mem $PC $A $P $X $Y $S $IPeriod $ICount $IRequest $IAutoReset $TrapBadOps $Trap $Trace $run_for $debug'; |
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=head1 NAME |
=head1 NAME |
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M6502 - perl bindings for 6502 emulator |
M6502 - perl bindings for M6502 CPU emulator |
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=cut |
=cut |
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our $PC = 0xbeef; |
our $PC = 0xbeef; |
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# CPU registars |
# CPU registars |
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our ( $A, $P, $X, $Y, $S ) = (0) x 5; |
our ( $A, $P, $X, $Y, $S ) = (0) x 5; |
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# Set IPeriod to number of CPU cycles between calls to Loop6502 |
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our $IPeriod = 1; |
our $IPeriod=1; # Set IPeriod to number of CPU cycles between calls to Loop6502 |
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our $ICount; |
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our $IRequest; # Set to the INT_IRQ when pending IRQ |
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our $IAutoReset; # Set to 1 to autom. reset IRequest |
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our $TrapBadOps=1; # Set to 1 to warn of illegal opcodes |
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our $Trap; # Set Trap to address to trace from |
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our $Trace; # Set Trace=1 to start tracing |
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# Exec6502 cycles |
# Exec6502 cycles |
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our $run_for = 0; |
our $run_for = 0; |
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=head1 init |
=head1 FUNCTIONS |
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=head2 init |
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Called before C<Run6502> |
Called before C<Run6502> |
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my $addr = shift; |
my $addr = shift; |
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warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug; |
warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug; |
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#$mem[$addr++] = $_ foreach @_; |
#$mem[$addr++] = $_ foreach @_; |
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$self->write($addr++, $_) foreach @_; |
# call low-level write |
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Arch::write($addr++, $_) foreach @_; |
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} |
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=head2 ram |
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Read series of bytes into memory without MMU interaction |
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my @code = $emu->ram( 0xc000, 0xc1000 ); |
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=cut |
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sub ram { |
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my $self = shift; |
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my ( $from, $to ) = @_; |
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warn sprintf("## M6502::ram(%04x,%04x)\n", $from, $to) if $self->debug; |
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return @mem[ $from .. $to ]; |
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} |
} |
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=head2 write_chunk |
=head2 write_chunk |
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sub push_R { |
sub push_R { |
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warn "## M6502::push_R(",dump(@_),")\n" if $debug; |
warn "## M6502::push_R(",dump(@_),")\n" if $debug; |
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my ( $a, $p, $x, $y, $s, $pc ) = @_; |
( $A, $P, $X, $Y, $S, $PC, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace ) = @_; |
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$PC = $pc; |
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$S=$s; $X=$x; $Y=$y; $P=$p; $A=$a; |
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dump_R(); |
dump_R(); |
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} |
} |
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=head2 dump_R |
=head2 dump_R |
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helper function which dumps registers |
helper function which dumps registers in humanly readable form |
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my $dump = dump_R; |
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=cut |
=cut |
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sub dump_R { |
sub dump_R { |
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warn sprintf("## M6502::dump_R PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x\n", $PC, $A, $P, $X, $Y, $S) if $debug; |
my $dump = sprintf(" PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x " |
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. "IPeriod:%d ICount:%d IRequest:%02x IAutoReset:%02x TrapBadOps:%d Trap:%d Trace:%d" |
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. "\n", |
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$PC, $A, $P, $X, $Y, $S, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace, |
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); |
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warn "## M6502::dump_R $dump" if $debug; |
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return $dump; |
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} |
} |
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=head1 SEE ALSO |
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L<Orao> is sample implementation using this module |
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=head1 AUTHOR |
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Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
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=head1 COPYRIGHT & LICENSE |
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Copyright 2007 Dobrica Pavlinusic, All Rights Reserved. |
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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=cut |
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1; |
1; |