Questions about a donation

From: Fred Cisin <>
Date: Sat Apr 27 19:42:31 2002

On Sat, 27 Apr 2002, Erik S. Klein wrote:

> I'm pretty sure that the single sided drives were long gone by the time
> the 256K motherboard came out.

Good point

> Of course, I've already proven the worth of my memory, so. . . :)

I really don't remember the IBM sequence, since I used aftermarket drives
(same Tandon drives for ~$200 v IBM's $540)
I do remember that I was using double sided drives with the "leaked" patch
for quite a while before IBM made them available along with support in
PC-DOS 1.10.
I have no idea when they changed the motherboard from 16-64K to 64-256K.

For the machine in question, the 64K to 192K upgrade could be either:
1) filling two more rows of RAM on a 64-256K motherboard
2) adding a 128K RAM card to an already full 16-64K motherboard.

BTW, when somebody says "64K motherboard", do they mean the 16-64K or the

Did IBM ever OFFICIALLY support the 640K conversion of the 64-256K board?

Grumpy Ol' Fred
Received on Sat Apr 27 2002 - 19:42:31 BST

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