6 |
use warnings; |
use warnings; |
7 |
|
|
8 |
use base qw/Class::Accessor/; |
use base qw/Class::Accessor/; |
9 |
__PACKAGE__->mk_accessors(qw(tape tape_pos tape_rate)); |
__PACKAGE__->mk_accessors(qw(tape tape_path tape_pos trace)); |
10 |
|
|
11 |
use File::Slurp; |
use File::Slurp; |
12 |
use Carp qw/confess/; |
use Carp qw/confess/; |
19 |
|
|
20 |
=head2 read_tape |
=head2 read_tape |
21 |
|
|
22 |
$self->read_tape; |
my $byte = $self->read_tape; |
23 |
|
|
24 |
=cut |
=cut |
25 |
|
|
33 |
} |
} |
34 |
} |
} |
35 |
|
|
36 |
my $loop; |
my $c_0 = 0; |
37 |
|
my $c_1 = 0; |
38 |
|
my $mask = 1; |
39 |
|
|
40 |
|
my $bits = ''; |
41 |
|
|
42 |
sub read_tape { |
sub read_tape { |
43 |
my $self = shift; |
my $self = shift; |
51 |
_warn "end of tape [$pos]"; |
_warn "end of tape [$pos]"; |
52 |
return -1; |
return -1; |
53 |
} |
} |
|
my $byte = ord(substr($self->tape,$pos,1)); |
|
54 |
|
|
55 |
if ( ++$loop % $self->tape_rate == 0 ) { |
if ( $c_0 ) { |
56 |
warn sprintf("tape pos %d = %02x\n", $pos, $byte); |
$c_0--; |
57 |
|
$bits .= "."; |
58 |
|
return 0; |
59 |
|
} |
60 |
|
if ( $c_1 ) { |
61 |
|
$c_1--; |
62 |
|
$bits .= "X"; |
63 |
|
return 255; |
64 |
|
} |
65 |
|
|
66 |
|
$mask = $mask << 1; |
67 |
|
if ( $mask > 0x80 ) { |
68 |
$pos++; |
$pos++; |
69 |
$self->tape_pos( $pos ); |
$self->tape_pos( $pos ); |
70 |
} |
$mask = 1; |
71 |
|
|
72 |
|
warn "# $bits\n"; |
73 |
|
$bits = ''; |
74 |
|
}; |
75 |
|
|
76 |
|
my $byte = ord( substr($self->tape,$pos,1) ); |
77 |
|
my $bit = $byte & $mask; |
78 |
|
warn sprintf("tape pos %d 0x%04x mask %02x and %02x = %d\n", $pos, $pos, $mask, $byte, $bit); # if $self->trace; |
79 |
|
|
80 |
|
( $c_0, $c_1 ) = ( 0x17, 0x17 ); |
81 |
|
( $c_0, $c_1 ) = ( 0x30, 0x30 ) if $bit; |
82 |
|
|
83 |
|
return 0; |
84 |
|
} |
85 |
|
|
86 |
|
=head2 write_tape |
87 |
|
|
88 |
|
$self->write_tape( $byte ); |
89 |
|
|
90 |
|
=cut |
91 |
|
|
92 |
|
|
93 |
|
sub write_tape { |
94 |
|
my ( $self, $byte ) = @_; |
95 |
|
|
96 |
|
$self->append_to_file( 'tape.dmp', $byte ); |
97 |
|
|
98 |
return $byte; |
return $byte; |
99 |
} |
} |
100 |
|
|
109 |
my $path = shift || return; |
my $path = shift || return; |
110 |
|
|
111 |
my $tape = read_file( $path ) || confess "can't load $path: $!"; |
my $tape = read_file( $path ) || confess "can't load $path: $!"; |
112 |
|
$self->tape_path( $path ); |
113 |
|
|
114 |
$self->tape_pos( 0 ); |
$self->tape_pos( 0 ); |
115 |
$self->tape( $tape ); |
$self->tape( $tape ); |
116 |
$self->tape_rate( 512 ); |
warn "loaded tape $path ", -s $path, " bytes\n"; |
|
warn "loaded tape $path ", -s $path, " bytes rate ", $self->tape_rate, "\n"; |
|
117 |
return 1; |
return 1; |
118 |
} |
} |
119 |
|
|
120 |
|
=head2 tape_status |
121 |
|
|
122 |
|
print $self->tape_status; |
123 |
|
|
124 |
|
=cut |
125 |
|
|
126 |
|
sub tape_status { |
127 |
|
my $self = shift; |
128 |
|
|
129 |
|
return "No tape in (simulated) drive" unless $self->tape; |
130 |
|
|
131 |
|
my $size = length( $self->tape ); |
132 |
|
|
133 |
|
return sprintf( |
134 |
|
"tape file: %s with %d 0x%x bytes, current position: %d 0x%x", |
135 |
|
$self->tape_path, $size, $size, $self->pos, $self->pos, |
136 |
|
); |
137 |
|
} |
138 |
|
|
139 |
|
=head1 SEE ALSO |
140 |
|
|
141 |
|
L<VRac> |
142 |
|
|
143 |
|
=cut |
144 |
|
|
145 |
1; |
1; |