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wraparound handling if crossing a page boundary at reading a word

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jborza 2019-05-07 20:24:16 +02:00
parent d0e5449ae1
commit 94aea533a9
1 changed files with 7 additions and 1 deletions
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6
memory.c
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@ -12,8 +12,14 @@ word fetch_word(State6502* state) {
} }
word read_word(State6502* state, word address) { word read_word(State6502* state, word address) {
if ((address & 0xFF) == 0xFF)
{
return state->memory[address] | state->memory[address - 0xFF] << 8;
}
else {
return state->memory[address] | state->memory[address + 1] << 8; return state->memory[address] | state->memory[address + 1] << 8;
} }
}
word get_address_zero_page(State6502* state) { word get_address_zero_page(State6502* state) {
return fetch_byte(state); return fetch_byte(state);