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Resetting the mask upon low byte write appears to resolve some issues.

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This commit is contained in:
Thomas Harte 2017-03-19 18:49:37 -04:00
parent 321030bb44
commit 4bb70e7d31
1 changed files with 7 additions and 4 deletions
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11
Machines/Atari2600/Cartridges/CartridgePitfall2.hpp
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@ -16,7 +16,8 @@ class CartridgePitfall2: public Cartridge<CartridgePitfall2> {
CartridgePitfall2(const std::vector<uint8_t> &rom) :
Cartridge(rom),
random_number_generator_(0),
featcher_address_{0, 0, 0, 0, 0, 0, 0, 0} {
featcher_address_{0, 0, 0, 0, 0, 0, 0, 0},
mask_{0, 0, 0, 0, 0, 0, 0, 0} {
rom_ptr_ = rom_.data();
}
@ -51,9 +52,10 @@ class CartridgePitfall2: public Cartridge<CartridgePitfall2> {
*value = rom_[8192 + address_for_counter(address & 7)];
break;
case 0x1010: case 0x1011: case 0x1012: case 0x1013: case 0x1014: case 0x1015: case 0x1016: case 0x1017:
*value = rom_[8192 + address_for_counter(address & 7)] & mask_[address & 7];
break;
case 0x1010: case 0x1011: case 0x1012: case 0x1013: case 0x1014: case 0x1015: case 0x1016: case 0x1017: {
uint8_t mask = mask_[address & 7];
*value = rom_[8192 + address_for_counter(address & 7)] & mask;
} break;
#pragma mark - Writes
@ -65,6 +67,7 @@ class CartridgePitfall2: public Cartridge<CartridgePitfall2> {
break;
case 0x1050: case 0x1051: case 0x1052: case 0x1053: case 0x1054: case 0x1055: case 0x1056: case 0x1057:
featcher_address_[address & 7] = (featcher_address_[address & 7] & 0xff00) | *value;
mask_[address & 7] = 0x00;
break;
case 0x1058: case 0x1059: case 0x105a: case 0x105b: case 0x105c: case 0x105d: case 0x105e: case 0x105f:
featcher_address_[address & 7] = (featcher_address_[address & 7] & 0x00ff) | (uint16_t)(*value << 8);