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From: Steve Nickolas <usotsuki@buric.co>
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Subject: Re: [TUHS] Story about Microsoft and *ix
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On Thu, 8 Apr 2021, Ed Bradford wrote:

> Does anyone recall how much RAM memory could be put on the first IBM 
> PC's? That was probably a major problem.

As I recall the earliest models supported 16-64K onboard, with later 
models supporting 64-256K.  The 1981 firmware was, IIRC, limited to 544K 
(changed to 640K in 1982).

-uso.