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Surprisingly, I think this may actually be the correct output: stopped throwing away the I part of the refresh register and flipped black and white.

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This commit is contained in:
Thomas Harte 2017-06-06 09:03:09 -04:00
parent cba07dec7e
commit ebbf6e6133
1 changed files with 5 additions and 5 deletions
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10
Machines/ZX8081/ZX8081.cpp
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@ -25,7 +25,7 @@ Machine::Machine() :
int Machine::perform_machine_cycle(const CPU::Z80::MachineCycle &cycle) { int Machine::perform_machine_cycle(const CPU::Z80::MachineCycle &cycle) {
cycles_since_display_update_ += (unsigned int)cycle.length; cycles_since_display_update_ += (unsigned int)cycle.length;
uint16_t r = 0; uint16_t refresh = 0;
uint16_t address = cycle.address ? *cycle.address : 0; uint16_t address = cycle.address ? *cycle.address : 0;
switch(cycle.operation) { switch(cycle.operation) {
case CPU::Z80::BusOperation::Output: case CPU::Z80::BusOperation::Output:
@ -50,16 +50,16 @@ int Machine::perform_machine_cycle(const CPU::Z80::MachineCycle &cycle) {
case CPU::Z80::BusOperation::ReadOpcode: case CPU::Z80::BusOperation::ReadOpcode:
set_hsync(false); set_hsync(false);
r = (uint8_t)get_value_of_register(CPU::Z80::Register::Refresh); refresh = get_value_of_register(CPU::Z80::Register::Refresh);
set_interrupt_line(!(r & 0x40)); set_interrupt_line(!(refresh & 0x40));
case CPU::Z80::BusOperation::Read: case CPU::Z80::BusOperation::Read:
if((address & 0xc000) == 0x0000) *cycle.value = rom_[address & (rom_.size() - 1)]; if((address & 0xc000) == 0x0000) *cycle.value = rom_[address & (rom_.size() - 1)];
else if((address & 0x4000) == 0x4000) { else if((address & 0x4000) == 0x4000) {
uint8_t value = ram_[address & 1023]; uint8_t value = ram_[address & 1023];
if(address&0x8000 && !(value & 0x40) && cycle.operation == CPU::Z80::BusOperation::ReadOpcode && !get_halt_line()) { if(address&0x8000 && !(value & 0x40) && cycle.operation == CPU::Z80::BusOperation::ReadOpcode && !get_halt_line()) {
size_t char_address = (size_t)((r & 0xff00) | ((value & 0x3f) << 3) | line_counter_); size_t char_address = (size_t)((refresh & 0xff00) | ((value & 0x3f) << 3) | line_counter_);
if((char_address & 0xc000) == 0x0000) { if((char_address & 0xc000) == 0x0000) {
uint8_t mask = (value & 0x80) ? 0xff : 0x00; uint8_t mask = (value & 0x80) ? 0x00 : 0xff;
value = rom_[char_address & (rom_.size() - 1)] ^ mask; value = rom_[char_address & (rom_.size() - 1)] ^ mask;
} }