Neon64 WIP 2024-06-22

More MMC5 support:

• Extended attributes
• PRG RAM mapping, 8K saving
• Multiplier
• 4K CHR bank mode

The Koei games generally work, Uncharted Waters is playable!

Just Breed and the SimCity prototype seem ok!

Metal Slader Glory works, but I think it needs a mid-frame palette change for the dialog area to show the correct colors.

Note that only games with 8K of battery-backed RAM can be saved, so these EWROM games which require 32KB saves will not save:

• Aoki Ookami to Shiroki Mejika: Genchou Hishi (Japan)
• Nobunaga no Yabou: Bushou Fuuunroku (Japan)
• Romance of the Three Kingdoms II (USA)
• Sangokushi II (Japan)

Sums $8f105519 $7e394f61

Full Changelog: wip-2024-06-16...wip-2024-06-22

Neon64 WIP 2024-06-16

New Mappers!

• Mapper 19 (Namco 129/163), no expansion audio
  • Pac-Man Championship Edition is playable, missing some audio
• Mapper 64 (Tengen RAMBO-1), scanline counter mode only
  • Klax (USA, Unlicensed) is playable, though the IRQ timing could be better
• Mapper 118 (TxSROM, Armadillo & Pro Sport Hockey)
• Mapper 119 (TQROM, Pin-Bot & High Speed), issue #21

Other fixes!

• MMC5 timing adjustments and fixes for more PRG modes
• MMC1 mode fixes (RoboCop 3)

Full Changelog: wip-2024-06-02...wip-2024-06-16

Sums $36275b72 $c0a65dd6

Neon64 WIP 2024-06-02

• Minimal MMC5 support for Castlevania 3 (#10)

CRC $48693ef1 $3be35df0

Neon64 WIP 2024-05-19

Quick build after squashing some bugs this weekend:

• MMC2 CHR bank switch for sprites now applies on the same line, fixes Mike Tyson's Punch-Out!!
• MMC3 CHR bank switch PPU catch-up, fixes flicker in Kirby's Adventure and Might & Magic
• Mid-line fine X hack fixes Rad Racer

Not quite ready for another numbered beta as I need to review and test a bit more. I may try to add a mapper or two now that I have more confidence in timing.

CRC: $990946af $dc0e6a92

Neon64 2.0 beta 4

New

• Controller 2!
• Mapper 11 (various Color Dreams), thanks to @sp1187!
• Mapper 34 (Deadly Towers), thanks to @ddp34!
• Mapper 66 (Doraemon, etc)
• Detect PAL from NES 2.0 header
• Unofficial opcodes (Deadly Towers, Aladdin, Streemerz, etc)

Fixed

• Controller detection issues #3 and #5
• More accurate PCM playback on PAL (e.g. High Hopes demo)
• More compatible video signal for compatibility with Retrotink (issue #8)
• DMC looping (Bomberman II, issue #3)
• Clock MMC3 IRQ counter (issue #4)
• CPU bug in Qix
• Initialize RAM to all 1s instead of 0s (Battletoads)
• Delay immediate NMI by one instruction (Bomberman II attract mode)
• Overall improved timing by delaying interrupts one instruction, though
  this is still not quite correct.
• Remap PC when leaving a bank (Deadly Towers)

Neon64 2.0 beta 3

• Add mappers 9, 10 (MMC2, MMC4)
• Added overlays, so mappers can modify the core PPU loop
• Runtime PAL switch
• Improved MMC3 IRQ timing
• DMC and frame counter IRQ
• Assorted timing adjustments
• Support some mid-line changes (e.g. Marble Madness)
• Fix MMC1 PRG mode 0 (e.g. Pirates!)
• SUROM support (Dragon Warrior III and IV)

Neon64 2.0 beta 2

First source release