/[VRac]/M6502/M6502.pm
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 35 by dpavlin, Mon Jul 30 21:53:04 2007 UTC revision 42 by dpavlin, Tue Jul 31 09:37:01 2007 UTC
# Line 6  use warnings; Line 6  use warnings;
6  use Data::Dump qw/dump/;  use Data::Dump qw/dump/;
7  use Carp qw/confess/;  use Carp qw/confess/;
8  use Exporter 'import';  use Exporter 'import';
9  our @EXPORT = qw'@mem $PC $A $P $X $Y $S $IPeriod';  our @EXPORT = qw'@mem $PC $A $P $X $Y $S $IPeriod $run_for';
10    
11  =head1 NAME  =head1 NAME
12    
# Line 23  our @mem = (0xff) x 0x10000;   # 64M Line 23  our @mem = (0xff) x 0x10000;   # 64M
23  # program counter  # program counter
24  our $PC = 0xbeef;  our $PC = 0xbeef;
25  # CPU registars  # CPU registars
26  our ( $A, $P, $X, $Y, $S ) = (0x42) x 5;  our ( $A, $P, $X, $Y, $S ) = (0) x 5;
27  # Set IPeriod to number of CPU cycles between calls to Loop6502  # Set IPeriod to number of CPU cycles between calls to Loop6502
28  our $IPeriod = 1;  our $IPeriod = 1;
29    # Exec6502 cycles
30    our $run_for = 0;
31    
32  =head1 init  =head1 init
33    
# Line 70  sub write { Line 72  sub write {
72    
73  =head2 poke_code  =head2 poke_code
74    
75  Write series of bytes into memory without passing through MMU  Write series of bytes into memory passing through MMU (C<read> and C<write>)
76    functions. If you don't want to trigger MMU, use C<write_chunk>.
77    
78    $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );    $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );
79    
# Line 80  sub poke_code { Line 83  sub poke_code {
83          my $self = shift;          my $self = shift;
84          my $addr = shift;          my $addr = shift;
85          warn sprintf("# poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;          warn sprintf("# poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;
86          $mem[$addr++] = $_ foreach @_;          #$mem[$addr++] = $_ foreach @_;
87            $self->write($addr++, $_) foreach @_;
88  }  }
89    
90  =head2 write_chunk  =head2 write_chunk
91    
92    Low-level update of memory, overriding user specified MMU functions C<read> and C<write>
93    
94    $emu->write_chunk( $address, $chunk_of_data );    $emu->write_chunk( $address, $chunk_of_data );
95    
96  =cut  =cut
# Line 116  sub ram { Line 122  sub ram {
122          confess "no from address";          confess "no from address";
123  }  }
124    
125    =head2 prompt
126    
127    Call this after C<< $run_for >> cycles have been run on processor
128    
129    =cut
130    
131    sub prompt {
132            warn "prompt -- you should override this\n";
133            return 1;
134    }
135    
136    =head2 push_R
137    
138    called by C<perl.c> to push changes in registars back to perl variables
139    
140    =cut
141    
142    sub push_R {
143            warn "push_R(",dump(@_),")\n";
144            my ( $a, $p, $x, $y, $s, $pc ) = @_;
145            $PC = $pc;
146            $S=$s; $X=$x; $Y=$y; $P=$p; $A=$a;
147            dump_R();
148    }
149    
150    =head2 dump_R
151    
152    helper function which dumps registers
153    
154    =cut
155    
156    sub dump_R {
157            warn sprintf("PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x\n", $PC, $A, $P, $X, $Y, $S);
158    }
159    
160  1;  1;
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