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Resolved 6560 addressing.

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This commit is contained in:
Thomas Harte 2016-06-10 18:12:21 -04:00
parent f3b1d7de82
commit 1ed04fae1e
2 changed files with 13 additions and 3 deletions
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2
Components/6560/6560.cpp
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@ -88,7 +88,7 @@ void MOS6560::set_register(int address, uint8_t value)
case 0x5:
_character_cell_start_address = (uint16_t)((value & 0x0f) << 10);
_video_matrix_start_address = (uint16_t)((_video_matrix_start_address & 0x0400) | ((value & 0xf0) << 5));
_video_matrix_start_address = (uint16_t)((_video_matrix_start_address & 0x0200) | ((value & 0xf0) << 6));
break;
case 0xe:

14
Machines/Vic-20/Vic20.cpp
View File

@ -27,8 +27,18 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
// run the phase-1 part of this cycle, in which the VIC accesses memory
uint16_t video_address = _mos6560->get_address();
if(!(video_address&0x1000)) video_address += 0x8000;
_mos6560->set_graphics_value(read_memory(video_address), _colorMemory[video_address & 0x03ff]);
uint8_t video_value = 0xff; // TODO
if(!(video_address&0x2000))
{
video_value = _characterROM[video_address & 0x0fff];
}
else
{
video_address &= 0x1fff;
if(video_address < sizeof(_userBASICMemory)) video_value = _userBASICMemory[video_address];
else if(video_address >= 0x1000 && video_address < 0x2000) video_value = _screenMemory[video_address&0x0fff];
}
_mos6560->set_graphics_value(video_value, _colorMemory[video_address & 0x03ff]);
// run the phase-2 part of the cycle, which is whatever the 6502 said it should be
if(isReadOperation(operation))