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Added guess on how colour memory and the 12-bit bus possibly works.

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This commit is contained in:
Thomas Harte 2016-06-05 16:28:06 -04:00
parent 2ab21e7a3c
commit 9e9e50edb1
3 changed files with 6 additions and 5 deletions
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6
Components/6560/6560.cpp
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@ -56,8 +56,8 @@ void MOS6560::set_register(int address, uint8_t value)
break;
}
printf("%02x: %02x\n", address, value);
printf("%04x %04x [%d by %d from %d, %d]\n", _character_cell_start_address, _video_matrix_start_address, _number_of_columns, _number_of_rows, _first_column_location, _first_row_location);
// printf("%02x: %02x\n", address, value);
// printf("%04x %04x [%d by %d from %d, %d]\n", _character_cell_start_address, _video_matrix_start_address, _number_of_columns, _number_of_rows, _first_column_location, _first_row_location);
}
uint16_t MOS6560::get_address()
@ -65,6 +65,6 @@ uint16_t MOS6560::get_address()
return 0x1c;
}
void MOS6560::set_graphics_value(uint8_t value)
void MOS6560::set_graphics_value(uint8_t value, uint8_t colour_value)
{
}

2
Components/6560/6560.hpp
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@ -19,7 +19,7 @@ class MOS6560 {
Outputs::CRT::CRT *get_crt() { return _crt.get(); }
uint16_t get_address();
void set_graphics_value(uint8_t value);
void set_graphics_value(uint8_t value, uint8_t colour_value);
void set_register(int address, uint8_t value);

3
Machines/Vic-20/Vic20.cpp
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@ -22,7 +22,8 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
set_reset_line(false);
// run the phase-1 part of this cycle, in which the VIC accesses memory
_mos6560->set_graphics_value(read_memory(_mos6560->get_address()));
uint16_t video_address = _mos6560->get_address();
_mos6560->set_graphics_value(read_memory(video_address), _colorMemory[video_address & 0x01ff]);
// run the phase-2 part of the cycle, which is whatever the 6502 said it should be
if(isReadOperation(operation))