MAMEWorld Forums - EmuChat - Re: MAME 2021 contributions appreciation

> I haven't yet looked for any graphics issues, but have noticed sound issues that I
> intend to look into soon. Even the Archimedes startup chime is incorrect, sounds
> scratchy.

If it's of any interest, the MK5 games have at least three different types of sound output depending on the games, even though the hardware is exactly the same and it's literally just a ROM swap when changing games. The earlier games have poor quality sound output even on real hardware, the quality reminds me of DOS outputting PCM audio to a PC speaker in lieu of a sound card, a janky lo-fi sound. Later games sound a lot better.

Notable examples to test if you're interested:

pengpayu - Early sound engine, attempts to play sounds but fails to stream larger data (the only three sounds which play back are the reel stop "click", the double-up-lost sound, and the win 5 credits tune - everything else is just a short burst of garbage data). I chose this set over other US games with the same issue (e.g. chickena5u, wnpost, swhr2u, mgarden, minemineu) as it's already been set up with default NVRAM.

oscara5a - Same sound engine as the above but seemingly doesn't send anything at all to the buffer.

oscara5 - Same game, newer sound engine, sound output is apparently fine aside from being twice as fast (in speed, not pitch - tied to frame rate/vblank/interlace I think; no idea what though).

multidrw - Special case (and video poker rather than a slot/fruit machine), the game has the newer sound style as oscara5 but the card flip sound doesn't work (the output for that sound effect is done the same way as the older games, so whatever previous data was still in the sound buffer is played instead e.g. drawing a new hand/card while the win music is still playing).

one4all - New Zealand games tend to have no sound at all (same issue as oscara5a), despite having the newer sound engine.