Heya.
I'm wondering if people are still interested in SidBlaster/USB devices. Now with the new driver by Stein Pedersen (http://csdb.dk/release/?id=136549) I got excited myself and built two units which are working like a charm. Confirmed compatibility with acid64, winvice and ccs64 atm. Also the multi device support he implemented is working, at least for me (there are some reported issues with this though). Unfortunately GoatTracker 2 is a whole different story. There's some serious timing/lag issues yet to be resolved.
I'm planning on producing a small batch of these but there's honestly still a lot work to be done. I've made some improvements over the original one (ease of use in mind, supports all revisions of the SID chip out of box) along with a new layout and case. I'm naturally giving away schematics and layouts for anyone to use (once I'm finished with the design).
Since there's loads of mismatching information concerning the filter caps, I hope someone could shine some light on this:
Originally C64 with 6581 (R2-AR4) came with 470pF ceramic caps while the datasheet suggest to use 2,2nF polystyrene caps. I've tried them both and concluded that using 470pF ceramic caps produces more or less the "authentic sound" we all know and love. I didn't really notice that much difference using the 2,2nF PS caps instead. In fact I found myself enjoying the sound even more with them mounted in...
And about 6582 / 8580R5, the datasheet suggest to use 6,8nF polystyrene caps but overall it seems that 22nF ceramic caps are more often suggested to use with these (I'm still waiting for a 8580R5 to test this out myself). What's the opinion here?
I can probably record some samples with the two 6581's I have with different caps if wanted, to hear the difference. Any tune suggestions?
-emblip