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Gets as far as seemingly yet another memory-map setting.

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Tomorrow, maybe?
This commit is contained in:
Thomas Harte 2020-10-27 22:31:58 -04:00
parent 0a91ac5af5
commit 267dd59a59
1 changed files with 20 additions and 4 deletions
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24
Machines/Apple/AppleIIgs/AppleIIgs.cpp
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@ -85,11 +85,25 @@ class ConcreteMachine:
forceinline Cycles perform_bus_operation(const CPU::WDC65816::BusOperation operation, const uint32_t address, uint8_t *const value) {
const auto &region = MemoryMapRegion(memory_, address);
printf("%06x\n", address);
if(region.flags & MemoryMap::Region::IsIO) {
// TODO: all IO accesses.
assert(false);
switch(address & 0xffff) {
// New video register.
case 0xc029:
if(isReadOperation(operation)) {
*value = 0;
} else {
printf("New video: %02x\n", *value);
// TODO: this bit should affect memory bank selection, somehow?
// Cf. Page 90.
}
break;
default:
// TODO: all other IO accesses.
printf("Unhandled IO: %04x\n", address);
assert(false);
}
} else {
if(isReadOperation(operation)) {
MemoryMapRead(region, address, value);
@ -98,6 +112,8 @@ class ConcreteMachine:
}
}
printf("%06x [%02x]\n", address, *value);
Cycles duration = Cycles(5);
// TODO: determine the cost of this access.