VRac/M6502/M6502.pm

package M6502;

use strict;
use warnings;

use Data::Dump qw/dump/;
use Carp qw/confess/;

=head1 NAME

M6502 - perl bindings for 6502 emulator

=cut

my $debug = 1;

our $VERSION = qw(0.0.1);

our @mem = (0xff) x 0x10000;    # 64M

# program counter
our $PC = 0xbeef;
# CPU registars
our ( $A, $P, $X, $Y, $S ) = (0) x 5;
# Set IPeriod to number of CPU cycles between calls to Loop6502
our $IPeriod = 1;

=head1 init

Called before C<Run6502>

=cut

sub init {
        warn "inside init\n";
        print "stdout\n";
};

=head2 read

Read from memory

  $byte = read( $address );

=cut

sub read {
        my ($addr) = @_;
        my $byte = $mem[$addr];
        warn "# read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;
        return $byte;
}

=head2 write

Write into emory

  write( $address, $byte );

=cut

sub write {
        warn "# write(",dump(@_),")\n" if $debug;
        my ($addr,$byte) = @_;
        $mem[$addr] = $byte;
}

=head2 poke_code

Write series of bytes into memory without passing through MMU

  $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );

=cut

sub poke_code {
        my $self = shift;
        my $addr = shift;
        warn sprintf("# poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;
        $mem[$addr++] = $_ foreach @_;
}

=head2 write_chunk

  $emu->write_chunk( $address, $chunk_of_data );

=cut

sub write_chunk {
        my ($self, $addr, $chunk) = @_;
        my $len = length($chunk);
        splice @mem, $addr, $len, unpack('C*', $chunk);
}

=head2 ram

Read searies of bytes from memory without passing through MMU

  $emu->ram( $from, $to );

=cut

sub ram {
        my $self = shift;
        my ($from,$to) = @_;
        if ($from + $to) {
                printf "ram %04x - %04x\n", $from, $to;
                return $mem[$from .. $to - 1];
        }
        printf "ram %04x\n", $from;
        return $mem[$from] if defined($from);
        confess "no from address";
}

1;
1	dpavlin	24	package M6502;
2
3			use strict;
4			use warnings;
5
6	dpavlin	27	use Data::Dump qw/dump/;
7	dpavlin	29	use Carp qw/confess/;
8	dpavlin	27
9	dpavlin	29	=head1 NAME
10	dpavlin	24
11	dpavlin	29	M6502 - perl bindings for 6502 emulator
12
13			=cut
14
15	dpavlin	27	my $debug = 1;
16	dpavlin	24
17	dpavlin	29	our $VERSION = qw(0.0.1);
18	dpavlin	27
19	dpavlin	29	our @mem = (0xff) x 0x10000; # 64M
20
21	dpavlin	25	# program counter
22	dpavlin	24	our $PC = 0xbeef;
23	dpavlin	25	# CPU registars
24			our ( $A, $P, $X, $Y, $S ) = (0) x 5;
25			# Set IPeriod to number of CPU cycles between calls to Loop6502
26	dpavlin	27	our $IPeriod = 1;
27	dpavlin	24
28	dpavlin	26	=head1 init
29
30			Called before C<Run6502>
31
32			=cut
33
34			sub init {
35			warn "inside init\n";
36			print "stdout\n";
37			};
38	dpavlin	27
39			=head2 read
40
41			Read from memory
42
43			$byte = read( $address );
44
45			=cut
46
47			sub read {
48			my ($addr) = @_;
49			my $byte = $mem[$addr];
50			warn "# read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;
51			return $byte;
52			}
53
54			=head2 write
55
56			Write into emory
57
58			write( $address, $byte );
59
60			=cut
61
62			sub write {
63			warn "# write(",dump(@_),")\n" if $debug;
64			my ($addr,$byte) = @_;
65			$mem[$addr] = $byte;
66			}
67	dpavlin	29
68			=head2 poke_code
69
70			Write series of bytes into memory without passing through MMU
71
72			$emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );
73
74			=cut
75
76			sub poke_code {
77			my $self = shift;
78			my $addr = shift;
79			warn sprintf("# poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;
80			$mem[$addr++] = $_ foreach @_;
81			}
82
83	dpavlin	31	=head2 write_chunk
84
85			$emu->write_chunk( $address, $chunk_of_data );
86
87			=cut
88
89			sub write_chunk {
90			my ($self, $addr, $chunk) = @_;
91			my $len = length($chunk);
92			splice @mem, $addr, $len, unpack('C*', $chunk);
93			}
94
95	dpavlin	29	=head2 ram
96
97			Read searies of bytes from memory without passing through MMU
98
99			$emu->ram( $from, $to );
100
101			=cut
102
103			sub ram {
104			my $self = shift;
105			my ($from,$to) = @_;
106			if ($from + $to) {
107	dpavlin	30	printf "ram %04x - %04x\n", $from, $to;
108	dpavlin	29	return $mem[$from .. $to - 1];
109			}
110	dpavlin	30	printf "ram %04x\n", $from;
111	dpavlin	29	return $mem[$from] if defined($from);
112			confess "no from address";
113			}
114
115	dpavlin	24	1;