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Merge pull request #138 from TomHarte/ZX81Ports

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Increases port decoding on the ZX81
This commit is contained in:
Thomas Harte 2017-06-23 08:32:21 -04:00 committed by GitHub
commit 2d02c23574
2 changed files with 13 additions and 7 deletions
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17
Machines/ZX8081/ZX8081.cpp
View File

@ -35,6 +35,7 @@ int Machine::perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
if(previous_counter < vsync_start_cycle_ && horizontal_counter_ >= vsync_start_cycle_) {
video_->run_for_cycles(vsync_start_cycle_ - previous_counter);
set_hsync(true);
line_counter_ = (line_counter_ + 1) & 7;
if(nmi_is_enabled_) {
set_non_maskable_interrupt_line(true);
}
@ -66,17 +67,20 @@ int Machine::perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
bool is_opcode_read = false;
switch(cycle.operation) {
case CPU::Z80::PartialMachineCycle::Output:
set_vsync(false);
line_counter_ = 0;
if(!(address & 2)) nmi_is_enabled_ = false;
if(!(address & 1)) nmi_is_enabled_ = is_zx81_;
if((address&3) == 3) {
if(!nmi_is_enabled_) {
set_vsync(false);
line_counter_ = 0;
}
}
break;
case CPU::Z80::PartialMachineCycle::Input: {
uint8_t value = 0xff;
if(!(address&1)) {
set_vsync(true);
if(!nmi_is_enabled_) set_vsync(true);
uint16_t mask = 0x100;
for(int c = 0; c < 8; c++) {
@ -90,7 +94,6 @@ int Machine::perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
} break;
case CPU::Z80::PartialMachineCycle::Interrupt:
line_counter_ = (line_counter_ + 1) & 7;
*cycle.value = 0xff;
horizontal_counter_ = 0;
break;
@ -106,9 +109,11 @@ int Machine::perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
}
if(latched_video_byte_) {
size_t char_address = (size_t)((address & 0xff00) | ((latched_video_byte_ & 0x3f) << 3) | line_counter_);
uint8_t mask = (latched_video_byte_ & 0x80) ? 0x00 : 0xff;
if(char_address < ram_base_) {
uint8_t mask = (latched_video_byte_ & 0x80) ? 0x00 : 0xff;
latched_video_byte_ = rom_[char_address & rom_mask_] ^ mask;
} else {
latched_video_byte_ = ram_[address & ram_mask_] ^ mask;
}
video_->output_byte(latched_video_byte_);

3
OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme
View File

@ -68,13 +68,14 @@
</AdditionalOptions>
</TestAction>
<LaunchAction
buildConfiguration = "Release"
buildConfiguration = "Debug"
selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
launchStyle = "0"
useCustomWorkingDirectory = "NO"
ignoresPersistentStateOnLaunch = "NO"
debugDocumentVersioning = "YES"
enableAddressSanitizer = "YES"
debugServiceExtension = "internal"
allowLocationSimulation = "NO">
<BuildableProductRunnable