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I'm not really sure what's going wrong with paging yet but this fixes the 0xc000 byte error.

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This commit is contained in:
Thomas Harte 2016-01-10 12:30:24 -05:00
parent e07981c147
commit d95414b2eb
1 changed files with 33 additions and 15 deletions
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48
Machines/Electron/Electron.cpp
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@ -35,7 +35,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
{
unsigned int cycles = 1;
if(address < 32768)
if(address < 0x8000)
{
if(isReadOperation(operation))
{
@ -56,7 +56,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
}
else
{
if(address > 49152)
if(address >= 0xc000)
{
if((address & 0xff00) == 0xfe00)
{
@ -90,18 +90,34 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
case 0x5:
if(!isReadOperation(operation))
{
uint8_t nextROM = (*value)&0xf;
if((_activeRom&0x12) != 0x8 || nextROM >= 8)
const uint8_t interruptDisable = (*value)&0xf0;
if( interruptDisable )
{
_activeRom = (Electron::ROMSlot)nextROM;
if( interruptDisable&0x10 ) _interruptStatus &= ~InterruptDisplayEnd;
if( interruptDisable&0x20 ) _interruptStatus &= ~InterruptRealTimeClock;
if( interruptDisable&0x40 ) _interruptStatus &= ~InterruptHighToneDetect;
evaluate_interrupts();
// TODO: NMI (?)
}
// else
{
uint8_t nextROM = (*value)&0xf;
if( (*value)&0x10 ) _interruptStatus &= ~InterruptDisplayEnd;
if( (*value)&0x20 ) _interruptStatus &= InterruptRealTimeClock;
if( (*value)&0x40 ) _interruptStatus &= InterruptHighToneDetect;
evaluate_interrupts();
// TODO: NMI (?)
// if(nextROM&0x08)
// {
// _activeRom = (Electron::ROMSlot)(nextROM&0x0e);
// printf("%d -> Paged %d\n", nextROM, _activeRom);
// }
if((_activeRom&12) != 8 || nextROM&8)
{
_activeRom = (Electron::ROMSlot)nextROM;
}
// else
// {
// printf("Ignored!");
// }
// printf("%d -> Paged %d\n", nextROM, _activeRom);
}
}
break;
case 0x6:
@ -119,7 +135,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
else
{
if(isReadOperation(operation))
*value = _os[address - 49152];
*value = _os[address & 16383];
}
}
else
@ -130,13 +146,15 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
{
case ROMSlotBASIC:
case ROMSlotBASIC+1:
*value = _basic[address - 32768];
*value = _basic[address & 16383];
break;
case ROMSlotKeyboard:
case ROMSlotKeyboard+1:
*value = 0;
*value = 0xf0;
break;
default:
*value = 0xff;
break;
default: break;
}
}
}