X1L3 - ARMALYTE - 8580 SID - 3 voice test

video upload by X1L3

"Progress on the SID chip module i've been working on in my spare time.
8580 SID in circuit.

Took a bit of trial and error making the different write routines needed to do the shared register kinds of things with the filter and stuff. But it's moved on from a single voice proof of concept to an almost fully functioning SID module now.

If you were there when the C64 was a thing, you'll know how good this thing is becoming at pretending to be the chip inside the C64 based on this tune that i knocked up quickly for it. It is pretty much doing what a SID can do in a C64. A nostalgic sound. Especially towards the end where the chip chord trills come in.

The test tune shows the different wave forms and how they sound. It confirms that the absolute ton of continuous data coming in isn't a problem. It shows the ultra fast voice multiplexing to do things like the mellow snare sound after the first four bars, and the not so fast switching in tonal variations later on. It also tells me that the click generated by using the sustain register as a voice volume control is a trivial flaw that can't even be heard here.

Tuning is a bit shabby as i don't have a precision Vref on the breaboard. It's close enough slumming it with the running hot 5v regulator for a proof of concept demo though."