Re: VIC-II DRAM refresh

Date: Fri, 14 Oct 2016 15:16:19 +0200
Message-Id: <>
> On 2016-10-14, at 14:18, Francesco Messineo <> wrote:

>>> None of us "lives" by repairing electronics from the '80s (or some of you still can maybe?)
>> I did it for a living long enough to get enough ;-) but I still - occasionally - refurbish some of those.
> it's something I like to do still now, but it's not worth any money for sure.

It can still be fun. And it's nice to see that there are people who value what you do and still like this stuff. I was for example truly happy to send just last night a fully refurbished 1541 with new DolphinDOS to a friendly dude with Italian-ish sounding name who lives down-under in MEL.

>> P. S. But I totally agree with your CIA being the most common failure in the 64 :-)
> my sample of substituted CIAs is probably in the 20s by now, nothing
> else is so numerous by a large amount. I would really understand why
> some CIAs can work on some systems though, now that it has mentioned
> by someone else.

I think I already wrote once about one case with CIA that I shall remember "forever", and which gained me a good friend too. A guy got his A2000 repaired somewhere out there from the black screen to a booting machine. But he had (I think it was printer) printer problems. So the A2000 landed on my (nomen omen) workbench. Clear case: failed bit on the port so without much thinking I pull the CIA, put a brand new one, fire the machine up, and... black screen! Hm... a failed new CIA? Another one.. the same. Maybe the machine blow my expensive chips?! No, the same CIAs work in another machine normally. And the broken CIA in another machine has the same bit broken as in the one from the customer...

Conclusion: a broken CIA, with broken port bit makes the machine boot normally (port bit obviously broken). A new, fully working CIA (works in every other machine normally) when placed in the computer in question makes it stop booting..

How's that for a Sherlock's case? ;-)


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Received on 2016-10-14 14:00:01

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