CP/M

From: Allison J Parent <allisonp_at_world.std.com>
Date: Wed Jun 17 21:16:17 1998

<> Actually the NS* contrller and the apple one are very close in that the
<> are minimalist. The NS controller can read media without index/sector
<
<As is the H17 - a USRT and a few TTL chips. Most of the work is done in
<software.

A USRT is far mor than minimalist as the NS* con troller is really just
bare shift register with timing logic around it.

<The H17 waits for a sector hole, waits for sync, reads a sector header (a
<checksums it in software), waits for sync, reads data and checksums that

Same with the NS*

<Does anyone know a source of hard-sectored 5.25" disks (10 sector ones in
<particular). I guess they're no longer made, alas. I have thought about
<making up a jig, dismantling a soft-sectored disk, punching the extra
<holes and putting the disk back in the jacket. Problem is resealing the
<edge of the jacket which I've opened.

Or doing it insitu using a old drive as a positioner.

Allison
Received on Wed Jun 17 1998 - 21:16:17 BST

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