IBM 5150 maximum memory?

Tony Duell ard at
Fri Apr 25 16:39:29 CDT 2008

> models.  "Not available yet" was the answer.  So, says I, "How about 
> buying some US models and running them at 120v 50Hz via a 
> transformer?"  "That would void the warranty" was the response.  

I wonder if it's the 'transformer' or the '50Hz' that voided the warranty.

I can't see how it matters where the 120V comes from -- whether it's from 
the distriution transformer bring the mains down from a multi-kV feeder 
or whether it's from a small trasnformer taking in 220V/240V from 
European mains. DId the terms of the warranty specify this? 

Did very early machines have AC fans? All the later ones certainly had 
12V DC ones that would be independant of mains frequency, but an AC fan 
would run slower on 50Hz and could cause the machine to overheat. Was it 
really that marginal (Acutally, given it's the IBM PC [1], I could 
beleive it was). 

[1] When I got my first IBM PC-family machine (a 5160), I took it to bits 
(what a suprise) and sat down with the TechRef. Every few minutes I'd 
exclaim 'They did WHAT???' as I found aother it of misdesign...


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