Re: 264/TED/Plus4 Story

From: crock <>
Date: Thu, 27 Oct 2011 22:24:39 +0200
Message-ID: <>
>> The 7501's from late '83 have no revision number, the early '84 ones all
>> say R1. The latest ones I have are from week 14, 1990 which are also R1!
> That's interesting since I have a 8501R4 from 4986. How come they went 
> back to R1 in 1990? Those from 1990 are 8501 and no longer 7501, right?
Sorry, a correction. The 1490 ones are CSG & not MOS and have no 
revision number. Yes, they're 8501's.
> Same here... TED, PLA and CPU get a heatsink and I replace the ROMs 
> with properly programmed 27C128. Saves some power and therefore 
> produces less heat inside the case. So far I haven't lost a CPU. Maybe 
> the ones that are still working are not as fragile as the ones that 
> died already. :)
I wondered that. Maybe the passivation of the cpu's is such that they 
are more susceptible to ageing once they get past the 'burn-in' they got 
in the 80's. :-)
>> I found a source of
>> 8501's in China last year and got 12 working ones.
> Interesting... All genuine MOS/CSG, no fakes?
I don't think so, they are a mix of production lines and manufacturing 
dates. If they are fakes, frankly I don't care - because they work!
> And all of the dead CPUs were made in 1984?
For some reason, I keep all the dead ones (perhaps in the hope they'll 
find a way to repair them in the futue :lol: ) A quick count tells me I 
have 8 dead 8501's and 2 dead 7501's - all from 1984. I have 2 dead 
TED's and another 1 with a blown keyboard latch.


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Received on 2011-10-27 21:00:16

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