SFX sound expander

From: Richard Atkinson (rga24_at_cam.ac.uk)
Date: 1998-12-11 20:12:19

Hi all. My latest acquisition is the Commodore Sound Expander for the
64/128. It is a cartridge port device the same shape as the Magic Voice
and inside there is a Yamaha YM3526 FM synthesis chip, some logic for the
optional music keyboard port and a bit of analogue circuitry to output the

I think these units are fairly rare; anyway I want to find out as much as
I can about its registers. There is the possibility of routing the output
through the SID chip, so you can have 3 SID channels, 8 FM channels and
the filter applied to either of them. Does anyone have any documentation
on this thing? As always, the Commodore-supplied software and docs are a
little lacking, to put it mildly.

Happy hacking,


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