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Switches CIA A/B byte connections; applies reset to memory map.

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This commit is contained in:
Thomas Harte 2021-07-19 22:17:40 -04:00
parent 486959bce8
commit 4515d1220c
1 changed files with 14 additions and 5 deletions
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19
Machines/Amiga/Amiga.cpp
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@ -70,6 +70,7 @@ class ConcreteMachine:
// Check for assertion of reset.
if(cycle.operation & Microcycle::Reset) {
memory_.reset();
LOG("Unhandled Reset; PC is around " << PADHEX(8) << mc68000_.get_state().program_counter);
}
@ -104,12 +105,12 @@ class ConcreteMachine:
if(cycle.operation & Microcycle::Read) {
uint16_t result = 0xffff;
if(!(address & 0x1000)) result &= 0x00ff | (cia_a_.read(reg) << 8);
if(!(address & 0x2000)) result &= 0xff00 | (cia_b_.read(reg) << 0);
if(!(address & 0x1000)) result &= 0xff00 | (cia_a_.read(reg) << 0);
if(!(address & 0x2000)) result &= 0x00ff | (cia_b_.read(reg) << 8);
cycle.set_value16(result);
} else {
if(!(address & 0x1000)) cia_a_.write(reg, cycle.value8_high());
if(!(address & 0x2000)) cia_b_.write(reg, cycle.value8_low());
if(!(address & 0x1000)) cia_a_.write(reg, cycle.value8_low());
if(!(address & 0x2000)) cia_b_.write(reg, cycle.value8_high());
}
} else if(address >= 0xdf'f000 && address <= 0xdf'f1be) {
#define RW(address) (address & 0xffe) | ((cycle.operation & Microcycle::Read) << 7)
@ -256,6 +257,10 @@ class ConcreteMachine:
// f8'0000 — : 256kb Kickstart if 2.04 or higher.
// fc'0000 – : 256kb Kickstart otherwise.
set_region(0xfc'0000, 0x1'00'0000, kickstart_.data(), CPU::MC68000::Microcycle::PermitRead);
reset();
}
void reset() {
set_overlay(true);
}
@ -325,7 +330,11 @@ class ConcreteMachine:
}
uint8_t get_port_input(MOS::MOS6526::Port port) {
(void)port;
if(port) {
LOG("TODO: parallel input?");
} else {
LOG("TODO: CIA A, port A input — FIR, RDY, TRK0, etc");
}
return 0xff;
}