Using 3.5" HD drives on CP/M systems

From: Fred Cisin <>
Date: Sun Feb 6 13:16:47 2005

On Sun, 6 Feb 2005, Vintage Computer Festival wrote:
> Here's a suggestion...
> The Epson PX-8 had 3.5" drives available as an add-on. The PX-8 was of
> course a CP/M machine. Why don't you start by investigating what Epson
> did?

A very good idea, except,...
The Epson Geneva PX-8 disks that I have seen used a
67.5 tpi 3.5" drive (40 tracks per side).
THOSE drives are VERY hard to find.
"Normal" 3.5" drives are 135 tpi.
YES, you could "double-track" it, and introduce track width problems.

But, to use that otherwise good idea, consider other 3.5" CP/M formats:
HP CP/M (77 track, but still 135tpi)
Mountain Side MSC-ICO
NEC 8201
Netway 1500
Olivetti ETV-250
Sony M35 CP/M
Sony SMC70
Received on Sun Feb 06 2005 - 13:16:47 GMT

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