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Amiga.org Amiga computer related discussion General chat about Amiga topics My A500 "project" pics, details, build log?

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Old 01-10-2013, 01:24 AM   #321
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Default Re: My A500 "project" pics, details, build log?

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 :-)
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Old 01-10-2013, 02:21 AM   #322
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Default Re: My A500 "project" pics, details, build log?

it sounds crackly... with both chips..
haven't put the "good" chip in the "bad" C64 as I dont want to risk damaging it.
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Old 01-10-2013, 02:30 AM   #323
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Default Re: My A500 "project" pics, details, build log?

I dont suppose anyone has a schematic for the 250407 C64 motherboard?
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Old 01-10-2013, 02:58 AM   #324
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Default Re: My A500 "project" pics, details, build log?

Quote:
Originally Posted by AmmoJammo View Post
I dont suppose anyone has a schematic for the 250407 C64 motherboard?
These might be helpful:

http://dl.dropbox.com/u/71121999/c64...mmodore_64.pdf

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

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

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Old 01-10-2013, 03:22 AM   #325
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Default Re: My A500 "project" pics, details, build log?

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*

Last edited by AmmoJammo; 01-10-2013 at 03:44 AM..
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Old 01-10-2013, 03:59 AM   #326
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Default Re: My A500 "project" pics, details, build log?

Cool, good luck.

I might re-cap mine one of these days but for now it works perfectly so i'll leave it.
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Old 01-10-2013, 04:02 AM   #327
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Default Re: My A500 "project" pics, details, build log?

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...
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Old 01-10-2013, 04:05 AM   #328
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Default Re: My A500 "project" pics, details, build log?

Hmm, good point - might buy one of those cap packs from eBay then - might do my 500's while I'm at it too.
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Old 01-10-2013, 01:05 PM   #329
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Default Re: My A500 "project" pics, details, build log?

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"



http://www.sinchai.de/index.php?main...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...
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Old 01-10-2013, 01:24 PM   #330
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Default Re: My A500 "project" pics, details, build log?

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)
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Old 01-10-2013, 05:09 PM   #331
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Default Re: My A500 "project" pics, details, build log?

Btw, I found a Seller on fleabay with a nice pack of replacement BreadBin c64 Caps and Voltage regulators for $10aud delivered so I grabbed a set.

http://www.ebay.com.au/itm/170858848...#ht_500wt_1130
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Old 01-11-2013, 03:02 AM   #332
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Default Re: My A500 "project" pics, details, build log?

I've recorded the Bolder Dash II music, is there anywhere good to host wave files? about 4 meg each.
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Old 01-11-2013, 03:27 AM   #333
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Default Re: My A500 "project" pics, details, build log?

youtube, with a stolen screenshot?

http://www.youtube.com/watch?v=94aTHJHgQSk

http://www.youtube.com/watch?v=pmN7FwRLz-c
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Old 01-11-2013, 04:51 PM   #334
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Default Re: My A500 "project" pics, details, build log?

I put the good chip in the bad motherboard... sounds good...
so, I have two bad SIDs...
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Old 01-11-2013, 07:35 PM   #335
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Default Re: My A500 "project" pics, details, build log?

Quote:
Originally Posted by AmmoJammo View Post
so, I have two bad SIDs...
That sucks, you can usually pickup replacements on ebay tho.
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Old 01-11-2013, 07:55 PM   #336
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Default Re: My A500 "project" pics, details, build log?

Btw, ive been given the below contact in France who supplies a500 Capacitor replacement kits.

http://leblogdecosmos.blogspot.fr/p/a-vendre.html

I've send him an email requesting 2 kits for my a500's.
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Last edited by djos; 01-11-2013 at 10:20 PM..
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Old 01-11-2013, 09:56 PM   #337
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Default Re: My A500 "project" pics, details, build log?

Early SID chips need 9vac to work properly on the C64 Breadbin model. Check your voltages and amperes.

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Old 01-11-2013, 11:05 PM   #338
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Default Re: My A500 "project" pics, details, build log?

they are all early SID chips, and I've been using the same power supply for all testing.

I have four chips total, two seems to work, two are crackly..

On another, related note, I made an XA1541 cable today, using 2N7000 mosfets from Jaycar, 60 cents each, needed four, plus a 25 pin male DB connector, already had a backshell, and I cut a spare floppy cable in half.

Well, it refused to work in Windows 7, so I pulled out an old Windows XP machine again







SO! any good games I should get? or even music demos? something to test the SID chips fully?
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Old 01-11-2013, 11:18 PM   #339
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Default Re: My A500 "project" pics, details, build log?

Here's SIDBench

http://dl.dropbox.com/u/71121999/c64/sidbench1.d64

This page might be useful during your testing:
http://ploguechipsounds.blogspot.com...benchmark.html

as for games, check usenet for the Blast Collection (almost 2,000 games in that collection).
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Last edited by djos; 01-11-2013 at 11:26 PM..
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Old 01-11-2013, 11:59 PM   #340
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Default Re: My A500 "project" pics, details, build log?

Are there any demos like on the Amiga?
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