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Adds guaranteed trip to ROM for vector pulls.

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This commit is contained in:
Thomas Harte 2020-11-29 21:29:15 -05:00
parent 46c1c9b5ee
commit acaa841822
1 changed files with 5 additions and 1 deletions

6
Machines/Apple/AppleIIgs/AppleIIgs.cpp

@ -195,7 +195,11 @@ class ConcreteMachine:
static uint64_t total = 0;
bool is_1Mhz = (region.flags & MemoryMap::Region::Is1Mhz) || !(speed_register_ & 0x80) || (speed_register_ & motor_flags_);
if(region.flags & MemoryMap::Region::IsIO) {
if(operation == CPU::WDC65816::BusOperation::ReadVector) {
// I think vector pulls always go to ROM?
// That's slightly implied in the documentation, and doing so makes GS/OS boot, so...
*value = rom_[rom_.size() - 65536 + address];
} else if(region.flags & MemoryMap::Region::IsIO) {
// Ensure classic auxiliary and language card accesses have effect.
const bool is_read = isReadOperation(operation);
memory_.access(uint16_t(address), is_read);