MAMEWorld Forums - EmuChat - Re: Galaxian background sound (hum) not quite right.

The text research almost reminds me of Gary Walton's (UK) long ago text-only research observation comparisons (before YouTube began back in 2006) between his pcb hardware/cabs versus MAME's emulation back in the post 2000 AD years when his text comparisons were part of MAME Testers entries back then.

The background sound effect issue is noted in the source code files, but not in extensive details when I had posted last month. I don't know if your findings would be added into source code....maybe more along line similar to the old entries Gary Walton used to post on MAME Testers back in the early days of MT.

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01/20/20

https://www.mameworld.info/ubbthreads/sh...part=1&vc=1

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src/mame/drivers/galaxian.cpp

TODO:
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- Problems with Galaxian based on the observation of a real machine:
- Background humming is incorrect. It's faster on a real machine
- Explosion sound is much softer. Filter involved?

src/mame/drivers/galaxold.cpp

TODO:
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- Problems with Galaxian based on the observation of a real machine:

- Starfield is incorrect. The speed and flashing frequency is fine, but the
stars appear in different positions.
- Background humming is incorrect. It's faster on a real machine
- Explosion sound is much softer. Filter involved?

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couriersud's work (netlist style replacing old discrete method) from last month was adding particular analog hardware filters for Konami pcb hardware run games. The netlist work for the game Galaxian itself is possibly on his future to-do list?

https://www.mameworld.info/ubbthreads/sh...part=1&vc=1

As I am guessing you are already familiar with Galaxian having different analog audio hardware variations, some of them could have entire audio being perfectly emulated while others such as bootlegs will not be unless pcb owners were to list all the specific components on some of the bootleg pcbs. Somewhat the same same issue like all the various Space Invaders pcbs etc.