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Attempted at least to manage appropriate data storage.

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This commit is contained in:
Thomas Harte 2017-03-19 17:31:08 -04:00
parent 031a68000a
commit 7c66c36d3f
1 changed files with 40 additions and 3 deletions
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43
Machines/Atari2600/Cartridges/CartridgePitfall2.hpp
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@ -25,8 +25,11 @@ class CartridgePitfall2: public Cartridge<CartridgePitfall2> {
if(!(address & 0x1000)) return;
switch(address) {
#pragma mark - Reads
// The random number generator
case 0x1000: case 0x1001: case 0x1002: case 0x1003:
case 0x1000: case 0x1001: case 0x1002: case 0x1003: case 0x1004:
if(isReadOperation(operation)) {
*value = random_number_generator_;
}
@ -39,13 +42,45 @@ class CartridgePitfall2: public Cartridge<CartridgePitfall2> {
) & 1));
break;
case 0x1040: case 0x1041: case 0x1042: case 0x1043: case 0x1044: case 0x1045: case 0x1046: case 0x1047:
// featcher_address_[address - 0x1040]
// Music fetcher
case 0x1005: case 0x1006: case 0x1007:
*value = 0x00;
printf("m\n");
break;
case 0x1008: case 0x1009: case 0x100a: case 0x100b: case 0x100c: case 0x100d: case 0x100e: case 0x100f:
printf("d\n");
break;
case 0x1010: case 0x1011: case 0x1012: case 0x1013: case 0x1014: case 0x1015: case 0x1016: case 0x1017:
printf("da\n");
break;
#pragma mark - Writes
case 0x1040: case 0x1041: case 0x1042: case 0x1043: case 0x1044: case 0x1045: case 0x1046: case 0x1047:
top_[address & 7] = *value;
break;
case 0x1048: case 0x1049: case 0x104a: case 0x104b: case 0x104c: case 0x104d: case 0x104e: case 0x104f:
bottom_[address & 7] = *value;
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;
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);
break;
case 0x1070: case 0x1071: case 0x1072: case 0x1073: case 0x1074: case 0x1075: case 0x1076: case 0x1077:
random_number_generator_ = 0;
break;
#pragma mark - Paging
case 0x1ff8: rom_ptr_ = rom_.data(); break;
case 0x1ff9: rom_ptr_ = rom_.data() + 4096; break;
#pragma mark - Business as usual
default:
if(isReadOperation(operation)) {
*value = rom_ptr_[address & 4095];
@ -56,6 +91,8 @@ class CartridgePitfall2: public Cartridge<CartridgePitfall2> {
private:
uint16_t featcher_address_[8];
uint8_t top_[8], bottom_[8];
uint8_t music_mode_[3];
uint8_t random_number_generator_;
uint8_t *rom_ptr_;
};