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Made basic attempt at 16-line character mode.

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This commit is contained in:
Thomas Harte 2016-06-12 11:23:57 -04:00
parent 19b2f46488
commit ed76e36b18
2 changed files with 5 additions and 5 deletions
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8
Components/6560/6560.cpp
View File

@ -83,7 +83,7 @@ void MOS6560::set_register(int address, uint8_t value)
case 0x3:
_number_of_rows = (value >> 1)&0x3f;
_wide_characters = !!(value&0x01);
_tall_characters = !!(value&0x01);
break;
case 0x5:
@ -151,7 +151,7 @@ uint16_t MOS6560::get_address()
if(_row_counter >= 0)
{
_row_counter++;
if(_row_counter == _number_of_rows*8) _row_counter = -1;
if(_row_counter == _number_of_rows*(_tall_characters ? 16 : 8)) _row_counter = -1;
}
else if(_vertical_counter == _first_row_location * 2)
{
@ -166,7 +166,7 @@ uint16_t MOS6560::get_address()
if(_column_counter == _number_of_columns*2)
{
_column_counter = -1;
if((_row_counter&7) == 7)
if((_row_counter&(_tall_characters ? 15 : 7)) == (_tall_characters ? 15 : 7))
{
_video_matrix_line_address_counter = _video_matrix_address_counter;
}
@ -226,7 +226,7 @@ uint16_t MOS6560::get_address()
*/
if(_column_counter&1)
{
return _character_cell_start_address + (_character_code*8) + (_row_counter&7);
return _character_cell_start_address + (_character_code*(_tall_characters ? 16 : 8)) + (_row_counter&(_tall_characters ? 15 : 7));
}
else
{

2
Components/6560/6560.hpp
View File

@ -27,7 +27,7 @@ class MOS6560 {
private:
std::unique_ptr<Outputs::CRT::CRT> _crt;
bool _interlaced, _wide_characters;
bool _interlaced, _tall_characters;
uint8_t _first_column_location, _first_row_location;
uint8_t _number_of_columns, _number_of_rows;
uint16_t _character_cell_start_address, _video_matrix_start_address;