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Added Super Chip emulation.
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@ -87,8 +87,21 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
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}
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}
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// check for a ROM read
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// check for a ROM read
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if((address&0x1000) && isReadOperation(operation)) {
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uint16_t masked_address = address & 0x1fff;
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returnValue &= rom_pages_[(address >> 10)&3][address&1023];
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if(address&0x1000)
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{
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if(isReadOperation(operation) && (!uses_superchip_ || masked_address > 0x10ff)) {
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returnValue &= rom_pages_[(address >> 10)&3][address&1023];
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}
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// check for a Super Chip RAM access
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if(uses_superchip_ && masked_address < 0x1100) {
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if(masked_address < 0x1080) {
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superchip_ram_[masked_address & 0x7f] = *value;
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} else {
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returnValue &= superchip_ram_[masked_address & 0x7f];
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}
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}
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}
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}
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// check for a RAM access
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// check for a RAM access
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@ -263,6 +276,8 @@ void Machine::configure_as_target(const StaticAnalyser::Target &target)
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rom_pages_[1] = &rom_[1024 & romMask];
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rom_pages_[1] = &rom_[1024 & romMask];
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rom_pages_[2] = &rom_[2048 & romMask];
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rom_pages_[2] = &rom_[2048 & romMask];
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rom_pages_[3] = &rom_[3072 & romMask];
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rom_pages_[3] = &rom_[3072 & romMask];
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uses_superchip_ = target.atari.uses_superchip;
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}
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}
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#pragma mark - Audio and Video
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#pragma mark - Audio and Video
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@ -56,9 +56,14 @@ class Machine:
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virtual void crt_did_end_batch_of_frames(Outputs::CRT::CRT *crt, unsigned int number_of_frames, unsigned int number_of_unexpected_vertical_syncs);
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virtual void crt_did_end_batch_of_frames(Outputs::CRT::CRT *crt, unsigned int number_of_frames, unsigned int number_of_unexpected_vertical_syncs);
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private:
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private:
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// ROM information
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uint8_t *rom_, *rom_pages_[4];
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uint8_t *rom_, *rom_pages_[4];
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size_t rom_size_;
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size_t rom_size_;
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// cartridge RAM expansion store
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uint8_t superchip_ram_[128];
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bool uses_superchip_;
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// the RIOT and TIA
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// the RIOT and TIA
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PIA mos6532_;
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PIA mos6532_;
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std::unique_ptr<TIA> tia_;
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std::unique_ptr<TIA> tia_;
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