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uneksija
Registered: Jan 2002
Posts: 44 |
c64 components
Hi 8-bit gurus,
I didn't find the exactly correct area for posting this, but this is the closest one so here it goes:
A local school has a bunch of old c64 parts in their storage room. I'm gonna buy the SIDs from there, but since I'm going there, I must ask: What other parts might be worth buying/taking? I mean like processors etc... I guess they would only be useful for fixing broken 64's, but do people usually even try to fix broken C64's? Please tell me what might be useful or what you need and I'll check if they have it!
Thanks in advance! |
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Shake
Posts: 133 |
It depends on how much storage room you have for a personal scrap yard :)
Take everything if they don't ask much for it. They probably will throw it away once and it's gone forever.
btw: the problem most of the times now is people who can fix them. I have this c64 with burned mem chip (the two below the 8500 on a 250469-rev.a board) bit it's soldered to the board. I can solder a little bit, but this will fail for sure :(
last year I asked at a dutch (ex)c64repair company (roostech) and they asked 25 euro for the chip, exclusive repair costs, blah.. better buy a second hand then.. still it's a pitty the c64 is broken)
http://upload.wikimedia.org/wikipedia/commons/9/93/C64Cmotherbo.. |
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tlr
Registered: Sep 2003
Posts: 1737 |
Obviously the SIDs, and also the 6526's (=CIA) which tend to be break very easily. Also the video chips.
These three together with the 6510 are crucial for the c64, most other parts can be replaced with modern parts.
I think the Signetics PLA's are said to be prone for error. I never had a failure on those myself though. And that can be replaced with other logic if necessary.
This is spoken from a breadbox view, someone else fill in for the 64C...
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MagerValp
Registered: Dec 2001
Posts: 1060 |
Grab everything.
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Graham
Account closed
Registered: Dec 2002
Posts: 990 |
Since in most C64s the CIAs, PLAs and other valueable stuff is not socketted, I'd take the whole bunch. |
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ready.
Registered: Feb 2003
Posts: 441 |
About c64 fixing:
Commodore 64 troubleshooting and repair guide |
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Raf
Registered: Nov 2003
Posts: 343 |
when I wanted to take all the commodore stuff from my former school they said something that's rather impossible - even if those machines were lying unused for years , unregistered from equipment index and so on... I asked about it several times ... all the stuff probably went to recycle bin already :(
(yeah , they used C64s in mid 90' to teach IT :) , since cicra 1997 they have PCs , and commodores were used as game machines for some time but later got exchanged with playstation - when I moved to that school in 1999 there were no visible commodores here - only some in basements ;p ) |
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tomz
Account closed
Registered: Sep 2006
Posts: 38 |
grab as much as you can,motherboards are the most useful as they are easy to fit but I would be inclined to grab as much of the gear as possible' take a bit,take it all' |
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uneksija
Registered: Jan 2002
Posts: 44 |
OK, thanks for the tips! I'm gonna visit the place in a few weeks. One more thing: What are the codes for the crucial chips (except for SID's)? I'm not sure if they've got them sorted in a logical way, so I've got no clue how to identify a video chip etc.
I did visit the place like 5 (or more) years ago and got two 6581R4's for free. They said they'll check the price for the rest of the SID's and I can come back later to buy them. Unfortunately it was difficult to reach the teachers by phone, and I moved (or had moved) to another city, so... I just kinda forgot about it. Yes, I need a kick in the butt. Fortunately they didn't throw the chips away when they cleaned the place a while ago, and this time I'm gonna get them for sure. Hopefully they don't want any insane price for the SID's or the rest of the chips. |
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uneksija
Registered: Jan 2002
Posts: 44 |
Forgot one thing:
A problem with my old-style C64 is the following: The SID sounds very distorted, it sounds like if the ring modulation is on all the time. Changing the SID didn't help... So what component might have gone bad if it's not the SID? I could try to look for this part from the place where I'll get the bunch of SID's etc.
Thanks in advance! |
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Raf
Registered: Nov 2003
Posts: 343 |
if this is filter-concerned - you may try to solder new pair of monolytic capacitors on pins 1-2 , 3-4
on other hand:
if you take sound+video from modulator this may be modulator issue , if you use sound output from a/v socket this may be preamplifier issue.
here are some chip labels... 65xx are for older and 85xx are for newer c64s...
6510 / 8500 - cpu
6581 /6582 / 8580 - sid
8565 / 6567 (?) - generally 856x and 656x are video chips ;-)
6526 (no 85xx xhip here - only 8520 is very similiar but not used in c64 even if it actually works - I exchanged the keyboard controlling chip some time ago and all was fine) - CIA
roms have special labelling - I'm too lazy just now to check them all ;-)
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