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Forums > C64 Composing > SID oscillator/envelope leakage in emulation?

2024-01-30 12:09

aeeben

Registered: May 2002
Posts: 44

SID oscillator/envelope leakage in emulation?

Try this on a real machine:

poke54296,15:poke54277,12:poke54278,12:poke54273,15:poke54276,33:poke54276,33

After the sound has decayed you can still hear the note pitch, although very faintly. It's louder than static though. I've observed this at least on the old SID.

poke54273,0 or poke54296,0 mutes it

Has anyone measured this leakage, does it also happen on 8580, and is it emulated in any SID emulator?

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2024-01-31 10:23

Jammer

Registered: Nov 2002
Posts: 1335

I'll try to do some thorough test with various register values before sound cut kicks in and record everything in free time.

2024-02-08 22:57

chatGPZ

Registered: Dec 2001
Posts: 11386

r44982 implements this now - get a build here in 20 minutes and check it out :)

2024-02-12 18:58

encore

Registered: Aug 2010
Posts: 67

I remember playing Yogi Bear on my C64C (with a 6581R4 inside) in the early 90s and hearing the sound effects continuously going on in the background (where it was supposed to be silent). It's nice to now also being able to hear it in emulation.

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