I fixed RTC emulation and now pass all of the tests by CasualPokePlayer. I think a lot of things are still wrong, but this now runs a lot closer to how the actual chip works so is improvable in the future if more tests are made.
I've been rewriting GBHawk as a C++ core so that all my cores have the same architecture. I've managed to get linking working in a much more compact way in the new core. I'll take what I learned in this process to redo the GBA linking for 4 players eventually.
I've also moved my NES core here as experimental so that everything is in the same place, no point having things spread out to multiple projects.
I've also added blank cores for SNES and N64. No clue when I might actually develop them, but I've found that when I'm too tired to do core development I can still make progress on the infrastructure stuff that doesn't take a lot of brain power largely copy paste from the other cores.
I've also removed a LOT of stuff from the front end code as I try to shrink and simplify it. Eventually I will move to the same lua structure as current BizHawk which will be another simplification.
Now that the GBHawk rewrite is done I can get back to GBA linking improvements and work on a new release.
I finally managed to figure out why the Snood TAS I was puzzled by crashes on console. On this frame, the same frame that crashes on console, the game turns off DMA 2 after a audio FIFO reload is triggered but before it starts (there is a few cycles in between the two events.) I'm not entirely sure of the details yet, but this evidently triggers a crash. Presumably this is what GBA Tek refers to as: "DMA lockup when stopping while starting ???"
I'm not entirely sure yet how I will handle this in emulator, the behavior observed on console seems very complicated. I'll probably just trigger a jam state for now.
I'll put together a test to demonstrate the crash.
65C816: PC, machine code, mnemonic, operands, registers (A, X, Y, SP, P), flags (NVTBDIZCR) Cycles SL F Cycle
008000: 78 SEI A:0000 X:0000 Y:0000 SP:01FE P:34 nvMXdIzcR Cy: 35 LY: 0 F-Cy: 0
008001: 9C 00 42 STZ $4200 A:0000 X:0000 Y:0000 SP:01FE P:34 nvMXdIzcR Cy: 50 LY: 0 F-Cy: 0
008004: 9C 0C 42 STZ $420C A:0000 X:0000 Y:0000 SP:01FE P:34 nvMXdIzcR Cy: 74 LY: 0 F-Cy: 0
008007: 9C 0B 42 STZ $420B A:0000 X:0000 Y:0000 SP:01FE P:34 nvMXdIzcR Cy: 98 LY: 0 F-Cy: 0
00800A: 9C 40 21 STZ $2140 A:0000 X:0000 Y:0000 SP:01FE P:34 nvMXdIzcR Cy: 122 LY: 0 F-Cy: 0
00800D: 9C 41 21 STZ $2141 A:0000 X:0000 Y:0000 SP:01FE P:34 nvMXdIzcR Cy: 146 LY: 0 F-Cy: 0
008010: 9C 42 21 STZ $2142 A:0000 X:0000 Y:0000 SP:01FE P:34 nvMXdIzcR Cy: 170 LY: 0 F-Cy: 0
008013: 9C 43 21 STZ $2143 A:0000 X:0000 Y:0000 SP:01FE P:34 nvMXdIzcR Cy: 194 LY: 0 F-Cy: 0
008016: A9 80 LDA #$80 A:0000 X:0000 Y:0000 SP:01FE P:34 nvMXdIzcR Cy: 218 LY: 0 F-Cy: 0
008018: 8D 00 21 STA $2100 A:0080 X:0000 Y:0000 SP:01FE P:B4 NvMXdIzcR Cy: 230 LY: 0 F-Cy: 0
00801B: 18 CLC A:0080 X:0000 Y:0000 SP:01FE P:B4 NvMXdIzcR Cy: 254 LY: 0 F-Cy: 0
00801C: FB XCE A:0080 X:0000 Y:0000 SP:01FE P:B4 NvMXdIzcR Cy: 266 LY: 0 F-Cy: 0
00801D: C2 38 REP #$38 A:0080 X:0000 Y:0000 SP:01FE P:B5 NvMXdIzCR Cy: 278 LY: 0 F-Cy: 0
00801F: A9 00 LDA #$00 A:0080 X:0000 Y:0000 SP:01FE P:8D NvmxdIzCR Cy: 296 LY: 0 F-Cy: 0
008022: 5B TCD A:0000 X:0000 Y:0000 SP:01FE P:0F nvmxdIZCR Cy: 314 LY: 0 F-Cy: 0
008023: A9 FF LDA #$FF A:0000 X:0000 Y:0000 SP:01FE P:0F nvmxdIZCR Cy: 326 LY: 0 F-Cy: 0
008026: 1B TCS A:01FF X:0000 Y:0000 SP:01FE P:0D nvmxdIzCR Cy: 344 LY: 0 F-Cy: 0
