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Fly Boy envelope decay #2

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jackson2k2 opened this issue Aug 14, 2024 · 1 comment
Open

Fly Boy envelope decay #2

jackson2k2 opened this issue Aug 14, 2024 · 1 comment

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@jackson2k2
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jackson2k2 commented Aug 14, 2024 •
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I noticed that MAME's AY-3-8910 core gets the sound in Fast Freddie/Fly Boy wrong at the moment; the envelope decay is supposed to be way less shallow (and when I try to hook it up to resistor output, the envelope decay is completely broken).
https://www.youtube.com/watch?v=O1xz18N56ms
Contrast to https://www.youtube.com/watch?v=qTR3Ij2mR5Q

If I'm correct the output circuit looks to be highly standard (from the Atari schematic), and there is nothing short circuiting the outputs.
image

As far as I know this core doesn't get it correct either. There may be something I'm missing (ignore the blips that are there for some reason)...
WAV recording.zip
@jackson2k2 jackson2k2 changed the title Fly Boy envelope decay Fly Boy envelope decay (not confirmed, possibly CPU interrupt issue) Aug 14, 2024
@jackson2k2 jackson2k2 changed the title Fly Boy envelope decay (not confirmed, possibly CPU interrupt issue) Fly Boy envelope decay Aug 29, 2024
@jackson2k2
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Even with the proper scanline interrupts (48, 112, 176, 240) the envelope decay is still broken.

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