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	package M6502;
2
3	use strict;
4	use warnings;
5
6	use Data::Dump qw/dump/;
7	use Carp qw/confess/;
8
9	=head1 NAME
10
11	M6502 - perl bindings for 6502 emulator
12
13	=cut
14
15	my $debug = 1;
16
17	our $VERSION = qw(0.0.1);
18
19	our @mem = (0xff) x 0x10000; # 64M
20
21	# program counter
22	our $PC = 0xbeef;
23	# 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	our $IPeriod = 1;
27
28	=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
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
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	=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	=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	printf "ram %04x - %04x\n", $from, $to;
108	return $mem[$from .. $to - 1];
109	}
110	printf "ram %04x\n", $from;
111	return $mem[$from] if defined($from);
112	confess "no from address";
113	}
114
115	1;