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Reflect that the I/O for Intel style processors isn't part of the CPU, but attached to the Bus and access controlled by the CPU.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon
2020-02-09 11:51:58 +00:00
parent dc37d61797
commit c8bdabf34f
24 changed files with 410 additions and 279 deletions
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12
src/BigEndianProcessor.cpp
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@@ -5,29 +5,29 @@ EightBit::BigEndianProcessor::BigEndianProcessor(Bus& memory)
: Processor(memory) {}
EightBit::register16_t EightBit::BigEndianProcessor::getWord() {
const auto high = busRead();
const auto high = memoryRead();
++BUS().ADDRESS();
const auto low = busRead();
const auto low = memoryRead();
return { low, high };
}
void EightBit::BigEndianProcessor::setWord(const register16_t value) {
busWrite(value.high);
memoryWrite(value.high);
++BUS().ADDRESS();
busWrite(value.low);
memoryWrite(value.low);
}
EightBit::register16_t EightBit::BigEndianProcessor::getWordPaged(const uint8_t page, const uint8_t offset) {
const auto high = getBytePaged(page, offset);
++BUS().ADDRESS().low;
const auto low = busRead();
const auto low = memoryRead();
return { low, high };
}
void EightBit::BigEndianProcessor::setWordPaged(const uint8_t page, const uint8_t offset, const register16_t value) {
setBytePaged(page, offset, value.high);
++BUS().ADDRESS().low;
busWrite(value.low);
memoryWrite(value.low);
}
EightBit::register16_t EightBit::BigEndianProcessor::fetchWord() {