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Fixed screen start address.

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This commit is contained in:
Thomas Harte 2016-01-09 22:52:08 -05:00
parent 1308332a71
commit e07981c147
1 changed files with 3 additions and 4 deletions
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7
Machines/Electron/Electron.cpp
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@ -79,10 +79,10 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
case 0x1:
break;
case 0x2:
_startScreenAddress = (_startScreenAddress & 0xff00) | ((*value) & 0xe0);
_startScreenAddress = (_startScreenAddress & 0xfe00) | (uint16_t)(((*value) & 0xe0) << 1);
break;
case 0x3:
_startScreenAddress = (_startScreenAddress & 0x00ff) | (uint16_t)(((*value) & 0x3f) << 8);
_startScreenAddress = (_startScreenAddress & 0x01ff) | (uint16_t)(((*value) & 0x3f) << 9);
break;
case 0x4:
printf("Cassette\n");
@ -250,8 +250,7 @@ inline void Machine::update_display()
for(int c = 0; c < 16; c+=2)
{
_currentLine[output_ptr + c] = (pixels&0x80) ? 0 : 7;
_currentLine[output_ptr + c + 1] = (pixels&0x80) ? 0 : 7;
_currentLine[output_ptr + c] = _currentLine[output_ptr + c + 1] = (pixels&0x80) ? 0 : 7;
pixels <<= 1;
}
}