6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2024-12-26 09:29:45 +00:00
Code Issues Projects Releases Wiki Activity

Made an attempt to fix my 0114 implementation.

Browse Source
This commit is contained in:
Thomas Harte 2016-02-20 23:13:58 -05:00
parent f7fc7cb932
commit 2b8fb5b615
1 changed files with 27 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
Storage/Tape/Formats/TapeUEF.cpp
View File

@ -89,7 +89,6 @@ Storage::Tape::Pulse Storage::UEF::get_next_pulse()
switch(_chunk_id)
{
case 0x0100: case 0x0102:
{
// In the ordinary ("1200 baud") data encoding format,
// a zero bit is encoded as one complete cycle at the base frequency.
// A one bit is two complete cycles at twice the base frequency.
@ -103,9 +102,8 @@ Storage::Tape::Pulse Storage::UEF::get_next_pulse()
next_pulse.length.length = _current_bit ? 1 : 2;
next_pulse.length.clock_rate = _time_base * 4;
_bit_position = (_bit_position+1)&(_current_bit ? 3 : 1);
} break;
break;
case 0x0114:
case 0x0110:
next_pulse.type = (_bit_position&1) ? Pulse::High : Pulse::Low;
next_pulse.length.length = 1;
@ -115,6 +113,27 @@ Storage::Tape::Pulse Storage::UEF::get_next_pulse()
if(!_bit_position) _chunk_position++;
break;
case 0x0114:
if(!_bit_position)
{
_current_bit = get_next_bit();
if(_first_is_pulse && !_chunk_position)
{
_bit_position++;
}
}
next_pulse.type = (_bit_position&1) ? Pulse::High : Pulse::Low;
next_pulse.length.length = _current_bit ? 1 : 2;
next_pulse.length.clock_rate = _time_base * 4;
_bit_position ^= 1;
if((_chunk_id == 0x0114) && (_chunk_position == _chunk_duration.length-1) && _last_is_pulse)
{
_chunk_position++;
}
break;
case 0x0112:
case 0x0116:
next_pulse.type = Pulse::Zero;
@ -132,7 +151,6 @@ void Storage::UEF::find_next_tape_chunk()
_chunk_position = 0;
_bit_position = 0;
while(1)
{
gzseek(_file, _start_of_next_chunk, SEEK_SET);
@ -156,7 +174,6 @@ void Storage::UEF::find_next_tape_chunk()
continue;
}
printf("Deal with %04x?\n", _chunk_id);
switch(_chunk_id)
{
case 0x0100: case 0x0102: // implicit and explicit bit patterns
@ -185,6 +202,7 @@ void Storage::UEF::find_next_tape_chunk()
// TODO: read lengths
// return;
case 0x0114: // security cycles
{
// read number of cycles
_chunk_duration.length = (uint32_t)gzgetc(_file);
_chunk_duration.length |= (uint32_t)gzgetc(_file) << 8;
@ -193,11 +211,7 @@ void Storage::UEF::find_next_tape_chunk()
// Ps and Ws
_first_is_pulse = gzgetc(_file) == 'P';
_last_is_pulse = gzgetc(_file) == 'P';
if(_first_is_pulse)
_bit_position ^= 1;
// TODO: last is pulse
}
break;
case 0x113: // change of base rate
@ -251,12 +265,14 @@ bool Storage::UEF::get_next_bit()
}
break;
// TODO: 0x0104, 0x0111
case 0x0114:
case 0x0102:
{
uint32_t bit_position = _chunk_position%8;
_chunk_position++;
if(!bit_position)
if(!bit_position && _chunk_position < _chunk_duration.length)
{
_current_byte = (uint8_t)gzgetc(_file);
}