33 |
} |
} |
34 |
} |
} |
35 |
|
|
36 |
|
my $c_0 = 0; |
37 |
|
my $c_1 = 0; |
38 |
|
my $mask = 1; |
39 |
|
|
40 |
sub read_tape { |
sub read_tape { |
41 |
my $self = shift; |
my $self = shift; |
42 |
if ( ! $self->tape ) { |
|
43 |
|
my $pos = $self->tape_pos; |
44 |
|
my $tape = $self->tape; |
45 |
|
|
46 |
|
if ( ! $tape ) { |
47 |
_warn "please load tape!"; |
_warn "please load tape!"; |
48 |
return 0; |
return 0; |
49 |
} |
} |
50 |
my $pos = $self->tape_pos; |
|
51 |
my $tape = $self->tape; |
if ( $c_0 ) { |
52 |
if ( $pos > length( $tape ) ) { |
$c_0--; |
53 |
|
return 0; |
54 |
|
} |
55 |
|
if ( $c_1 ) { |
56 |
|
$c_1--; |
57 |
|
return 255; |
58 |
|
} |
59 |
|
|
60 |
|
$mask = $mask << 1; |
61 |
|
if ( $mask > 0x80 ) { |
62 |
|
$pos++; |
63 |
|
$self->tape_pos( $pos ); |
64 |
|
$mask = 1; |
65 |
|
} |
66 |
|
|
67 |
|
my $byte = 0; |
68 |
|
my $tape_len = length( $tape ); |
69 |
|
|
70 |
|
if ( $pos <= $tape_len ) { |
71 |
|
$byte = ord( substr($self->tape,$pos,1) ); |
72 |
|
warn sprintf("## tape pos %d/%d %.02f%% 0x%04x = %02x\n", $pos, $tape_len, ($pos * 100) / $tape_len, $pos, $byte); |
73 |
|
} elsif ( $pos == $tape_len ) { |
74 |
_warn "end of tape [$pos]"; |
_warn "end of tape [$pos]"; |
|
return -1; |
|
75 |
} |
} |
76 |
|
|
77 |
my $byte = ord( substr($self->tape,$pos,1) ); |
my $bit = $byte & $mask; |
78 |
warn sprintf("tape pos %d = %02x\n", $pos, $byte); # if $self->trace; |
#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 |
} |
} |
113 |
|
|
114 |
$self->tape_pos( 0 ); |
$self->tape_pos( 0 ); |
115 |
$self->tape( $tape ); |
$self->tape( $tape ); |
116 |
warn "loaded tape $path ", -s $path, " bytes rate ", $self->tape_rate, "\n"; |
warn "loaded tape $path ", -s $path, " bytes\n"; |
117 |
return 1; |
return 1; |
118 |
} |
} |
119 |
|
|
120 |
=head tape_status |
=head2 tape_status |
121 |
|
|
122 |
print $self->tape_status; |
print $self->tape_status; |
123 |
|
|