mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-02-24 07:02:27 +01:00
55f19c3e0d
byuu says:
Changelog:
- Master System: merged Bus into CPU
- Mega Drive: merged BusCPU into CPU; BusAPU into AU
- Mega Drive: added TMSS emulation; disabled by default [hex\_usr]
- VDP lockout not yet emulated
- processor/arm7tdmi: renamed interrupt() to exception()
- processor/arm7tdmi: CPSR.F (FIQ disable) flag is set on reset
- processor/arm7tdmi: pipeline decode stage caches CPSR.T (THUMB mode)
[MerryMage]
- fixes `msr_tests.gba` test F
- processor/arm7tdmi/disassembler: add PC address to left of currently
executing instruction
- processor/arm7tdmi: stop forcing CPSR.M (mode flags) bit 4 high (I
don't know what really happens here)
- processor/arm7tdmi: undefined instructions now generate Undefined
0x4 exception
- processor/arm7tdmi: thumbInstructionAddRegister masks PC by &~3
instead of &~2
- hopefully this is correct; &~2 felt very wrong
- processor/arm7tdmi: thumbInstructionStackMultiple can use sequential
timing for PC/LR PUSH/POP [Cydrak]
- systems/Mega Drive.sys: added tmss.rom; enable with cpu version=1
- tomoko: detect when a ruby video/audio/input driver crashes higan;
disable it on next program startup
v104 blockers:
- Mega Drive: support 8-bit SRAM (even if we don't support 16-bit;
don't force 8-bit to 16-bit)
- Mega Drive: add region detection support to icarus
- ruby: add default audio device information so certain drivers won't
default to silence out of the box
52 lines
1.4 KiB
C++
52 lines
1.4 KiB
C++
auto APU::read(uint16 addr) -> uint8 {
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if((addr & 0xe000) == 0x0000) {
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return ram[addr];
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}
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if(addr == 0x4000) return ym2612.readStatus();
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if(addr == 0x4001) return ym2612.readStatus();
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if(addr == 0x4002) return ym2612.readStatus();
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if(addr == 0x4003) return ym2612.readStatus();
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if((addr & 0x8000) == 0x8000) {
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return cartridge.read(io.bank << 15 | (addr & 0x7ffe)).byte(!addr.bit(0));
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}
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}
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auto APU::write(uint16 addr, uint8 data) -> void {
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if((addr & 0xe000) == 0x0000) {
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ram[addr] = data;
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return;
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}
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if(addr == 0x4000) return ym2612.writeAddress(0 << 8 | data);
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if(addr == 0x4001) return ym2612.writeData(data);
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if(addr == 0x4002) return ym2612.writeAddress(1 << 8 | data);
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if(addr == 0x4003) return ym2612.writeData(data);
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if(addr == 0x6000) {
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//1-bit shift register
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io.bank = data.bit(0) << 8 | io.bank >> 1;
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return;
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}
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if(addr == 0x7f11) return psg.write(data);
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if(addr == 0x7f13) return psg.write(data);
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if(addr == 0x7f15) return psg.write(data);
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if(addr == 0x7f17) return psg.write(data);
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if((addr & 0x8000) == 0x8000) {
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//todo: do 8-bit writes mirror to 16-bits?
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return cartridge.write(io.bank << 15 | (addr & 0x7ffe), data << 8 | data << 0);
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}
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}
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//unused on Mega Drive
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auto APU::in(uint8 addr) -> uint8 {
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return 0x00;
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}
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//unused on Mega Drive
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auto APU::out(uint8 addr, uint8 data) -> void {
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}
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