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Merge pull request #138 from TomHarte/ZX81Ports
Increases port decoding on the ZX81
This commit is contained in:
commit
2d02c23574
@ -35,6 +35,7 @@ int Machine::perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
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if(previous_counter < vsync_start_cycle_ && horizontal_counter_ >= vsync_start_cycle_) {
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if(previous_counter < vsync_start_cycle_ && horizontal_counter_ >= vsync_start_cycle_) {
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video_->run_for_cycles(vsync_start_cycle_ - previous_counter);
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video_->run_for_cycles(vsync_start_cycle_ - previous_counter);
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set_hsync(true);
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set_hsync(true);
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line_counter_ = (line_counter_ + 1) & 7;
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if(nmi_is_enabled_) {
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if(nmi_is_enabled_) {
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set_non_maskable_interrupt_line(true);
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set_non_maskable_interrupt_line(true);
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}
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}
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@ -66,17 +67,20 @@ int Machine::perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
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bool is_opcode_read = false;
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bool is_opcode_read = false;
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switch(cycle.operation) {
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switch(cycle.operation) {
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case CPU::Z80::PartialMachineCycle::Output:
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case CPU::Z80::PartialMachineCycle::Output:
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set_vsync(false);
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line_counter_ = 0;
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if(!(address & 2)) nmi_is_enabled_ = false;
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if(!(address & 2)) nmi_is_enabled_ = false;
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if(!(address & 1)) nmi_is_enabled_ = is_zx81_;
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if(!(address & 1)) nmi_is_enabled_ = is_zx81_;
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if((address&3) == 3) {
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if(!nmi_is_enabled_) {
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set_vsync(false);
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line_counter_ = 0;
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}
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}
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break;
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break;
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case CPU::Z80::PartialMachineCycle::Input: {
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case CPU::Z80::PartialMachineCycle::Input: {
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uint8_t value = 0xff;
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uint8_t value = 0xff;
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if(!(address&1)) {
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if(!(address&1)) {
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set_vsync(true);
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if(!nmi_is_enabled_) set_vsync(true);
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uint16_t mask = 0x100;
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uint16_t mask = 0x100;
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for(int c = 0; c < 8; c++) {
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for(int c = 0; c < 8; c++) {
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@ -90,7 +94,6 @@ int Machine::perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
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} break;
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} break;
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case CPU::Z80::PartialMachineCycle::Interrupt:
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case CPU::Z80::PartialMachineCycle::Interrupt:
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line_counter_ = (line_counter_ + 1) & 7;
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*cycle.value = 0xff;
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*cycle.value = 0xff;
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horizontal_counter_ = 0;
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horizontal_counter_ = 0;
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break;
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break;
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@ -106,9 +109,11 @@ int Machine::perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
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}
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}
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if(latched_video_byte_) {
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if(latched_video_byte_) {
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size_t char_address = (size_t)((address & 0xff00) | ((latched_video_byte_ & 0x3f) << 3) | line_counter_);
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size_t char_address = (size_t)((address & 0xff00) | ((latched_video_byte_ & 0x3f) << 3) | line_counter_);
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uint8_t mask = (latched_video_byte_ & 0x80) ? 0x00 : 0xff;
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if(char_address < ram_base_) {
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if(char_address < ram_base_) {
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uint8_t mask = (latched_video_byte_ & 0x80) ? 0x00 : 0xff;
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latched_video_byte_ = rom_[char_address & rom_mask_] ^ mask;
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latched_video_byte_ = rom_[char_address & rom_mask_] ^ mask;
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} else {
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latched_video_byte_ = ram_[address & ram_mask_] ^ mask;
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}
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}
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video_->output_byte(latched_video_byte_);
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video_->output_byte(latched_video_byte_);
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@ -68,13 +68,14 @@
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</AdditionalOptions>
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</AdditionalOptions>
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</TestAction>
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</TestAction>
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<LaunchAction
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<LaunchAction
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buildConfiguration = "Release"
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buildConfiguration = "Debug"
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selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
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selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
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selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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launchStyle = "0"
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launchStyle = "0"
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useCustomWorkingDirectory = "NO"
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useCustomWorkingDirectory = "NO"
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ignoresPersistentStateOnLaunch = "NO"
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ignoresPersistentStateOnLaunch = "NO"
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debugDocumentVersioning = "YES"
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debugDocumentVersioning = "YES"
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enableAddressSanitizer = "YES"
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debugServiceExtension = "internal"
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debugServiceExtension = "internal"
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allowLocationSimulation = "NO">
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allowLocationSimulation = "NO">
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<BuildableProductRunnable
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<BuildableProductRunnable
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