/[VRac]/Galeb.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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Contents of /Galeb.pm

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Revision 174 - (show annotations)
Mon Aug 6 18:17:12 2007 UTC (11 years, 9 months ago) by dpavlin
File size: 4310 byte(s)
Implemented basic Galeb emulator (no keyboard, text output). It boots :-)
1 package Galeb;
2
3 use warnings;
4 use strict;
5
6 use Carp qw/confess/;
7 use File::Slurp;
8 use Data::Dump qw/dump/;
9 use M6502;
10 use Screen;
11
12 use base qw(Class::Accessor VRac M6502 Screen Prefs Session);
13 #__PACKAGE__->mk_accessors(qw());
14
15 =head1 NAME
16
17 Galeb - Galeb emulator
18
19 =head1 VERSION
20
21 Version 0.00
22
23 =cut
24
25 our $VERSION = '0.00';
26
27 =head1 SUMMARY
28
29 Emulator for Galeb 8-bit 6502 machine from Croatia
30
31 =cut
32
33 =head1 FUNCTIONS
34
35 =head2 run
36
37 Start emulator, open L<Screen>, load initial ROM images, and start emulator loop
38
39 =cut
40
41 our $emu;
42
43 sub run {
44 my $self = shift;
45
46 warn "Galeb calling upstream init\n";
47 $self->SUPER::init(
48 read => sub { $self->read( @_ ) },
49 write => sub { $self->write( @_ ) },
50 );
51
52 warn "Galeb $Galeb::VERSION emulation starting\n";
53
54 $self->scale( 2 );
55 $self->show_mem( 1 );
56 $self->load_session( 'sess/current' );
57
58 $self->open_screen;
59 $self->load_rom({
60 0xc000 => 'rom/Galeb/BAS01.rom',
61 0xc800 => 'rom/Galeb/BAS02.rom',
62 0xd000 => 'rom/Galeb/BAS03.rom',
63 0xd800 => 'rom/Galeb/BAS04.rom',
64 0xf000 => 'rom/Galeb/EXMD.rom',
65 0xf800 => 'rom/Galeb/MAKbug.rom',
66 });
67
68 $PC = $mem[ 0xfffc ];
69 warn sprintf("starting from address at 0xfffc = 0x%04x", $PC);
70
71 $emu = $self;
72
73 my ( $trace, $debug ) = ( $self->trace, $self->debug );
74 $self->trace( 0 );
75 $self->debug( 0 );
76
77 warn "rendering memory\n";
78 $self->render_mem( @mem );
79
80 M6502::reset();
81
82 $self->loop( sub {
83 my $run_for = shift;
84 warn sprintf("about to exec from PC %04x for %d cycles\n", $PC, $run_for) if $self->trace;
85 M6502::exec( $run_for );
86 $self->render_vram;
87 });
88 };
89
90
91 =head1 Helper functions
92
93 =head2 load_image
94
95 Load binary files, ROM images and Galeb Emulator files
96
97 $emu->load_image( '/path/to/file', 0x1000 );
98
99 Returns true on success.
100
101 =cut
102
103 sub load_image {
104 my $self = shift;
105 my ( $path, $addr ) = @_;
106
107 if ( ! -e $path ) {
108 warn "ERROR: file $path doesn't exist\n";
109 return;
110 }
111
112 my $size = -s $path || confess "no size for $path: $!";
113
114 my $buff = read_file( $path );
115
116 if ( $size == 65567 ) {
117 $addr = 0;
118 warn sprintf "loading Galaksija emulator 64k dump %s at %04x - %04x %02x\n", $path, $addr, $addr+$size-1, $size;
119 $self->write_chunk( $addr, substr($buff,0x20) );
120 return 1;
121 }
122
123 printf "loading %s at %04x - %04x %02x\n", $path, $addr, $addr+$size-1, $size;
124 $self->write_chunk( $addr, $buff );
125 return 1;
126 };
127
128
129 =head1 Memory management
130
131 =cut
132
133 =head2 read
134
135 Read from memory
136
137 $byte = read( $address );
138
139 =cut
140
141 sub read {
142 my $self = shift;
143 my ($addr) = @_;
144 return if ( $addr > 0xffff );
145 my $byte = $mem[$addr];
146 confess sprintf("can't find memory at address %04x",$addr) unless defined($byte);
147 warn sprintf("# Galeb::read(%04x) = %02x\n", $addr, $byte) if $self->trace;
148
149 $self->mmap_pixel( $addr, 0, $byte, 0 ) if $self->show_mem;
150 return $byte;
151 }
152
153 =head2 write
154
155 Write into emory
156
157 write( $address, $byte );
158
159 =cut
160
161 sub write {
162 my $self = shift;
163 my ($addr,$byte) = @_;
164 warn sprintf("# Galeb::write(%04x,%02x)\n", $addr, $byte) if $self->trace;
165
166 if ( $addr > 0xc000 ) {
167 confess sprintf "write access 0x%04x > 0xc000 aborting\n", $addr;
168 }
169
170 $self->mmap_pixel( $addr, $byte, 0, 0 ) if $self->show_mem;
171 $mem[$addr] = $byte;
172 return;
173 }
174
175 =head1 Architecture specific
176
177 =head2 render_vram
178
179 Render one frame of video ram
180
181 $self->render_vram;
182
183 =cut
184
185 my $last_dump = '';
186
187 sub render_vram {
188 my $self = shift;
189
190 my $addr = 0xb000;
191
192 my $dump;
193
194 for my $y ( 0 .. 15 ) {
195 $dump .= sprintf "%2d: %s\n",$y, join('', map { chr( $_ ) } @mem[ $addr+15 .. $addr+62 ] );
196 $addr += 64;
197 }
198
199 if ( $dump ne $last_dump ) {
200 print $dump;
201 $last_dump = $dump;
202 }
203 }
204
205 =head2 cpu_PC
206
207 Helper metod to set or get PC for current architecture
208
209 =cut
210
211 sub cpu_PC {
212 my ( $self, $addr ) = @_;
213 if ( defined($addr) ) {
214 $PC = $addr;
215 warn sprintf("running from PC %04x\n", $PC);
216 };
217 return $PC;
218 }
219
220 =head1 SEE ALSO
221
222 L<VRac>, L<M6502>, L<Screen>, L<Tape>
223
224 =head1 AUTHOR
225
226 Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
227
228 =head1 ACKNOWLEDGEMENTS
229
230 See also L<http://www.foing.hr/~fng_josip/orao.htm> which is source of all
231 info about this machine (and even hardware implementation from 2007).
232
233 =head1 COPYRIGHT & LICENSE
234
235 Copyright 2007 Dobrica Pavlinusic, All Rights Reserved.
236
237 This program is free software; you can redistribute it and/or modify it
238 under the same terms as Perl itself.
239
240 =cut
241
242 1; # End of Galeb

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