free DEC M7555 card

From: Allison <ajp166_at_bellatlantic.net>
Date: Mon May 6 10:04:31 2002

From: Doc <doc_at_mdrconsult.com>
> I've been wondering, based on some old posts to the CP/M groups. Will
>the same disk, for example an ST251, format and work off either an MFM
>or an ESDI controller? Totally true, totally false, depends on drive?
> For that mmatter, is there a good newbie-level reference for the 2
>interfaces? They were history when I started playing with keyboards,
>and I never dreamed I'd need to know.

The problem with EDSI was it sued the same cables as MFM IE: the pair
of 26 pin and 34pin. The interfaces however were toally incompatable.

No, a St251 would not interface to EDSI. It will interface to both MFM and
RLL though RLL may/may_not be reliable with that drive. I have used ST225s
with RLL controllers to get ~30mb from them (st225 is 20mb MFM).

Allison
Received on Mon May 06 2002 - 10:04:31 BST