Forum64

Announcement:

The "SID Symphony II" cartridge is now available, and can be found on the Digital Audio Concepts website (http://digitalaudioconcepts.com), along with the internal stereo SID board and my prototyping cartridge board.

The SID Symphony II can be mapped into any 32-byte slot from $DE00 to $DFE0, and should be work fine alongside most other hardware expansions. Works with all stereo-aware software that can address a SID in the above range. It is possible to add a jumper to the cartridge to pick up other page address signals inside the computer (such as $D7xx in the C128 ).

Each board features an access LED, reset button, and a proper 12v DC-to-DC converter for use with the good old 6581 SID chip. Each board comes preset for $DE00, which can be changed by flipping one or more DIP switches. The audio-in line is grounded by default to reduce background noise, which one can undo by simply cutting a jumper pad.

The SID Symphony II is supplied without a SID chip, and is designed to fit into standard Commodore-issue case shells and their clones.

$39.95 each, plus shipping

This is a limited edition run, so as the old trope goes, "Hurry, while supplies last!"

It wouldn't be hard at all to add such a feature, and indeed I hadn't even considered making it switchable in that manner. However, it would require the parts you suggest, plus parts to switch between the two filter capacitor values. So, it would increase the parts count and cost, and there's a question of the regulator costing too much current from the 12v DC-DC converter the board uses.

It might be more viable if I offer a variant already built for the 8580.