Using 3.5" HD drives on CP/M systems

From: Joe R. <>
Date: Mon Feb 7 06:41:26 2005

At 11:16 AM 2/6/05 -0800, you wrote:
>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?
>NO. NO. NO.
>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)

   I've got one of these buried away somewhere if anyone gets serious about
invetigating them. (No, it's not for sale).

Received on Mon Feb 07 2005 - 06:41:26 GMT

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