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◆ main openmsx / src / MSXVictorHC9xSystemControl.cc
1.9 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
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#include "MSXVictorHC9xSystemControl.hh"
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#include "serialize.hh"
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#include <cassert>
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// This implementation is documented in the HC-95 service manual:
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//
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// System control:
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// 7FFD  I/O      bit 0    NMI CONTROL         "0" ENABLE
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//       I/O      bit 1    INT CONTROL         "1" ENABLE
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//       I/O      bit 2    WAIT CONTROL        "0" ENABLE
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//       I/O      bit 3    JVC MODE ACK FLAG   "1" JVC ACK
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//       I/O      bit 4    FDC DREQ CONTROL    "1" ENABLE
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//       I/O      bit 5    RS-232C FLAG        "1" ENABLE
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//       I        bit 6    TURBO MODE FLAG     "1" TURBO
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//       I        bit 7    JVC MODE FLAG       "0" JVC MODE
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// turbo mode is determined by a physical switch on the machine (hence readonly)
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namespace openmsx {
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MSXVictorHC9xSystemControl::MSXVictorHC9xSystemControl(const DeviceConfig& config)
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	: MSXDevice(config)
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{
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}
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byte MSXVictorHC9xSystemControl::readMem(uint16_t address, EmuTime time)
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{
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	return peekMem(address, time);
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}
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byte MSXVictorHC9xSystemControl::peekMem(uint16_t address, EmuTime /*time*/) const
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{
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	(void)address; // avoid warning for non-assert compiles
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	assert (address == 0x7FFD);
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	return systemControlRegister;
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}
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void MSXVictorHC9xSystemControl::writeMem(uint16_t address, byte value, EmuTime /*time*/) {
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	(void)address; // avoid warning for non-assert compiles
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	assert (address == 0x7FFD);
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	systemControlRegister = (value & 0x3F) | 0x80;
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}
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bool MSXVictorHC9xSystemControl::allowUnaligned() const
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{
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	// OK, because this device doesn't call any 'fillDeviceXXXCache()'functions.
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	return true;
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}
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template<typename Archive>
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void MSXVictorHC9xSystemControl::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.template serializeBase<MSXDevice>(*this);
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	ar.serialize("systemControlRegister", systemControlRegister);
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}
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INSTANTIATE_SERIALIZE_METHODS(MSXVictorHC9xSystemControl);
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REGISTER_MSXDEVICE(MSXVictorHC9xSystemControl, "VictorHC9xSystemControl");
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} // namespace openmsx