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Took basic steps towards supporting memory expansions.

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This commit is contained in:
Thomas Harte 2016-08-13 17:21:25 -04:00
parent 0a13dd5c5b
commit a547b7e1d8
2 changed files with 32 additions and 4 deletions
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28
Machines/Commodore/Vic-20/Vic20.cpp
View File

@ -35,9 +35,33 @@ Machine::Machine() :
_tape.set_delegate(this);
// establish the memory maps
set_memory_size(MemorySize::Default);
// _debugPort.reset(new ::Commodore::Serial::DebugPort);
// _debugPort->set_serial_bus(_serialBus);
// _serialBus->add_port(_debugPort);
}
void Machine::set_memory_size(MemorySize size)
{
memset(_processorReadMemoryMap, 0, sizeof(_processorReadMemoryMap));
memset(_processorWriteMemoryMap, 0, sizeof(_processorWriteMemoryMap));
switch(size)
{
default: break;
case ThreeKB:
write_to_map(_processorReadMemoryMap, _expansionRAM, 0x0000, 0x1000);
write_to_map(_processorWriteMemoryMap, _expansionRAM, 0x0000, 0x1000);
break;
case ThirtyTwoKB:
write_to_map(_processorReadMemoryMap, _expansionRAM, 0x0000, 0x8000);
write_to_map(_processorWriteMemoryMap, _expansionRAM, 0x0000, 0x8000);
break;
}
// install the ROMs and VIC-visible memory
write_to_map(_processorReadMemoryMap, _userBASICMemory, 0x0000, sizeof(_userBASICMemory));
write_to_map(_processorReadMemoryMap, _screenMemory, 0x1000, sizeof(_screenMemory));
write_to_map(_processorReadMemoryMap, _colorMemory, 0x9400, sizeof(_colorMemory));
@ -48,10 +72,6 @@ Machine::Machine() :
write_to_map(_processorWriteMemoryMap, _userBASICMemory, 0x0000, sizeof(_userBASICMemory));
write_to_map(_processorWriteMemoryMap, _screenMemory, 0x1000, sizeof(_screenMemory));
write_to_map(_processorWriteMemoryMap, _colorMemory, 0x9400, sizeof(_colorMemory));
// _debugPort.reset(new ::Commodore::Serial::DebugPort);
// _debugPort->set_serial_bus(_serialBus);
// _serialBus->add_port(_debugPort);
}
void Machine::write_to_map(uint8_t **map, uint8_t *area, uint16_t address, uint16_t length)

8
Machines/Commodore/Vic-20/Vic20.hpp
View File

@ -32,6 +32,12 @@ enum ROMSlot {
Drive
};
enum MemorySize {
Default,
ThreeKB,
ThirtyTwoKB
};
#define key(line, mask) (((mask) << 3) | (line))
enum Key: uint16_t {
@ -259,6 +265,7 @@ class Machine:
_userPortVIA->set_joystick_state(input, isPressed);
_keyboardVIA->set_joystick_state(input, isPressed);
}
void set_memory_size(MemorySize size);
inline void set_use_fast_tape_hack(bool activate) { _use_fast_tape_hack = activate; }
inline void set_should_automatically_load_media(bool activate) { _should_automatically_load_media = activate; }
@ -291,6 +298,7 @@ class Machine:
uint8_t _characterROM[0x1000];
uint8_t _basicROM[0x2000];
uint8_t _kernelROM[0x2000];
uint8_t _expansionRAM[0x8000];
uint8_t *_rom;
uint16_t _rom_address, _rom_length;