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Video about Lisa sound

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kewatsdop:

--- Quote from: blusnowkitty on April 12, 2022, 03:23:09 pm ---
--- Quote from: stepleton on April 12, 2022, 03:15:30 pm ---I think you are absolutely right and that things can be pushed quite a bit further --- maybe even fuzzy-sounding audio sample playback is possible.
--- End quote ---

if a 4.77MHz IBM 5150 can push 4-channel Amiga modules down the PC Speaker, there's no reason a Lisa can't do the same thing...

--- End quote ---

@blusnowkitty
Exactly. PCs could, though, address the speaker pin directly while Lisa has to push out bits via the shift register. But that should not be limiting given proper handling of IRQs. On the plus side, Lisa has addressable pins to control volume, something PC speaker didn't have. I'm particularly curious about clever uses of that feature.

@stepleton
Thank you! Indeed, I was unable to locate any demos or software with any sound sophistication other than beeps. I hope this video challenges others to try and code much better music than my experiments. Similarly to the 1-bit demoscene productions for the ZX Spectrum, Apple II, etc.

@rayarachelian
I tried the emulator now, version https://lisaem.sunder.net/downloads/lisaem-1.2.7-RC4-2022.04.01-macos-11.0-arm64.pkg, on an M1 Mac. There is definitely improvement, as it is not crashing anymore (yay!), but the sound is not what is expected. From the attached dc42 image, on my Lisa 2 I'm getting coherent music (it should sound like this: https://soundcloud.com/adam-podstawczynski/inishcarra?utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing), from the emulator I'm getting buzzing sounds only.

rayarachelian:

--- Quote from: kewatsdop on April 12, 2022, 04:02:38 pm ---@rayarachelian
I tried the emulator now, version https://lisaem.sunder.net/downloads/lisaem-1.2.7-RC4-2022.04.01-macos-11.0-arm64.pkg, on an M1 Mac. There is definitely improvement, as it is not crashing anymore (yay!), but the sound is not what is expected. From the attached dc42 image, on my Lisa 2 I'm getting coherent music (it should sound like this: https://soundcloud.com/adam-podstawczynski/inishcarra?utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing), from the emulator I'm getting buzzing sounds only.

--- End quote ---

Great, that helps, I'll try your code vs LisaEm and try to get the two to match.

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