33 |
} |
} |
34 |
} |
} |
35 |
|
|
36 |
|
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; |
44 |
if ( ! $self->tape ) { |
if ( ! $self->tape ) { |
52 |
return -1; |
return -1; |
53 |
} |
} |
54 |
|
|
55 |
|
if ( $c_0 ) { |
56 |
|
$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++; |
69 |
|
$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) ); |
my $byte = ord( substr($self->tape,$pos,1) ); |
77 |
warn sprintf("tape pos %d = %02x\n", $pos, $byte); # if $self->trace; |
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 |
$pos++; |
( $c_0, $c_1 ) = ( 0x17, 0x17 ); |
81 |
$self->tape_pos( $pos ); |
( $c_0, $c_1 ) = ( 0x30, 0x30 ) if $bit; |
82 |
|
|
83 |
return $byte; |
return 0; |
84 |
} |
} |
85 |
|
|
86 |
=head2 write_tape |
=head2 write_tape |
93 |
sub write_tape { |
sub write_tape { |
94 |
my ( $self, $byte ) = @_; |
my ( $self, $byte ) = @_; |
95 |
|
|
96 |
$self->append_to_file( 'tape.dmp', chr($byte) ); |
$self->append_to_file( 'tape.dmp', $byte ); |
97 |
|
|
98 |
return $byte; |
return $byte; |
99 |
} |
} |