My A500 "project" pics, details, build log?

[AmmoJammo]

Anywhere that sells capacitors? :p
These came from Jaycar, there was someone on ebay selling a "set" of replacement capacitors and voltage regulators too.

[Azryl]

I don't have any store local that sell electroic components, so I either drive 60kms to a Jaycar store or buy online.

Which is why I asked

Az

[AmmoJammo]

60km? so, about half an hour? :p

I removed the "bad" SID chip, and fitted a socket...

put a different SID in, and it sounds exactly the same... whats the chance of two chips failing in an almost identical way?

Is there a good game/music/demo to fully test the SID?

[djos]

I've got a sid test program I'll send you later tonight. (.d64)

[AmmoJammo]

what about sending me a floppy disc? xD
how exactly does the program work?

Thanks for the email btw

[djos]

what about sending me a floppy disc? xD
how exactly does the program work?

Thanks for the email btw

Bring a disc around to my place sat arvo and I'll copy it for you if you like?

It plays a bunch of test tones to test all the Sid features, was handy when I had a dead Sid.

[Lurch]

Why not just play some music/sounds on it? If it's bad then it'll sound bad??

Pretty low chance of two SID's failing, could try a working good SID from another C64. Or try the "bad" SID in a known good C64 :-)

[AmmoJammo]

it sounds crackly... with both chips..
haven't put the "good" chip in the "bad" C64 as I dont want to risk damaging it.

[AmmoJammo]

I dont suppose anyone has a schematic for the  250407 C64 motherboard?

[djos]

I dont suppose anyone has a schematic for the  250407 C64 motherboard?

These might be helpful:

http://dl.dropbox.com/u/71121999/c64/Troubleshooting_and_Repairing_your_Commodore_64.pdf

http://dl.dropbox.com/u/71121999/c64/Commodore_64_Troubleshooting_and_Repair_Guide.pdf

http://dl.dropbox.com/u/71121999/c64/Commodore_1541_Troubleshooting_and_Repair_Guide.pdf

:cool:

[AmmoJammo]

I think the capacitor thats in series with the audio output is C13 on my motherboard... but its C77 on one schematic I've seen, and C37 in the second link you posted...

So, I might start by replacing that.

edit: my mistake, C37 is a different part *goes off to look*

[djos]

Cool, good luck.

I might re-cap mine one of these days but for now it works perfectly so i'll leave it.

[AmmoJammo]

The problem with leaving it is, that apparently if there's excessive ripple on the 5 volt rail, the memory chips can be the first thing to suffer...

[djos]

Hmm, good point - might buy one of those cap packs from eBay then - might do my 500's while I'm at it too.

[AmmoJammo]

I ordered a Nano SwinSID the other day... I think...

The webpage was entirely in German, and my German extends as far as "Guten tag"

:p

http://www.sinchai.de/index.php?main_page=product_info&products_id=90

Of course, I'm still not convinced that the SIDs are bad... perhaps tonight, I'll take the plunge, and plug the "bad" chip(s) into the "good" motherboard... :p

[djos]

Lol, get a 1541u2, they do pretty good dual Sid emulation and transform your c64 into a real beast (REU up to 16mb, all save carts, jiffy dos rom support, tap support, g64 support etc)