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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'; |
our @EXPORT = qw'@mem $PC $A $P $X $Y $S $IPeriod $run_for $debug'; |
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=head1 NAME |
=head1 NAME |
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=cut |
=cut |
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my $debug = 1; |
my $debug = 0; |
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our $VERSION = qw(0.0.1); |
our $VERSION = qw(0.0.1); |
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# Set IPeriod to number of CPU cycles between calls to Loop6502 |
# Set IPeriod to number of CPU cycles between calls to Loop6502 |
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our $IPeriod = 1; |
our $IPeriod = 1; |
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# Exec6502 cycles |
# Exec6502 cycles |
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our $run_for = 1; |
our $run_for = 0; |
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$run_for = 0x42; |
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=head1 init |
=head1 init |
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sub init { |
sub init { |
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my $self = shift; |
my $self = shift; |
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warn dump(@_); |
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warn "inside init low-level M6502 from $self\n"; |
warn "inside init low-level M6502 from $self\n"; |
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}; |
}; |
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sub read { |
sub read { |
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my ($addr) = @_; |
my ($addr) = @_; |
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my $byte = $mem[$addr]; |
my $byte = $mem[$addr]; |
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warn "# read(",dump(@_),") = ",dump( $byte ),"\n" if $debug; |
warn "## M6502::read(",dump(@_),") = ",dump( $byte ),"\n" if $debug; |
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return $byte; |
return $byte; |
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} |
} |
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=cut |
=cut |
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sub write { |
sub write { |
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warn "# write(",dump(@_),")\n" if $debug; |
warn "## M6502::write(",dump(@_),")\n" if $debug; |
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my ($addr,$byte) = @_; |
my ($addr,$byte) = @_; |
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$mem[$addr] = $byte; |
$mem[$addr] = $byte; |
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} |
} |
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=head2 poke_code |
=head2 poke_code |
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Write series of bytes into memory without passing through MMU |
Write series of bytes into memory passing through MMU (C<read> and C<write>) |
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functions. If you don't want to trigger MMU, use C<write_chunk>. |
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$emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa ); |
$emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa ); |
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sub poke_code { |
sub poke_code { |
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my $self = shift; |
my $self = shift; |
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my $addr = shift; |
my $addr = shift; |
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warn sprintf("# 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++, $_) foreach @_; |
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} |
} |
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=head2 write_chunk |
=head2 write_chunk |
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Low-level update of memory, overriding user specified MMU functions C<read> and C<write> |
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$emu->write_chunk( $address, $chunk_of_data ); |
$emu->write_chunk( $address, $chunk_of_data ); |
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=cut |
=cut |
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splice @mem, $addr, $len, unpack('C*', $chunk); |
splice @mem, $addr, $len, unpack('C*', $chunk); |
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} |
} |
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=head2 ram |
=head2 prompt |
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Read searies of bytes from memory without passing through MMU |
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$emu->ram( $from, $to ); |
Call this after C<< $run_for >> cycles have been run on processor |
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107 |
=cut |
=cut |
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109 |
sub ram { |
sub prompt { |
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my $self = shift; |
warn "prompt -- you should override this\n"; |
111 |
my ($from,$to) = @_; |
return 1; |
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warn "ram($from,$to)\n"; |
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if ($from + $to) { |
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printf "ram %04x - %04x\n", $from, $to; |
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return @mem[$from .. $to - 1]; |
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} |
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printf "ram %04x\n", $from; |
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return $mem[$from] if defined($from); |
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confess "no from address"; |
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112 |
} |
} |
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=head2 push_R |
=head2 push_R |
118 |
=cut |
=cut |
119 |
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120 |
sub push_R { |
sub push_R { |
121 |
warn "push_R(",dump(@_),")\n"; |
warn "## M6502::push_R(",dump(@_),")\n" if $debug; |
122 |
my ( $a, $p, $x, $y, $s, $pc ) = @_; |
my ( $a, $p, $x, $y, $s, $pc ) = @_; |
123 |
$PC = $pc; |
$PC = $pc; |
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$S=$s; $X=$x; $Y=$y; $P=$p; $A=$a; |
$S=$s; $X=$x; $Y=$y; $P=$p; $A=$a; |
132 |
=cut |
=cut |
133 |
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134 |
sub dump_R { |
sub dump_R { |
135 |
warn sprintf("PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x\n", $PC, $A, $P, $X, $Y, $S); |
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; |
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} |
} |
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138 |
1; |
1; |