Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!bellcore!decvax!genrad!panda!talcott!harvard!seismo!brl-adm!brl-smoke!smoke!JCrow@his-phoenix-multics.arpa
From: JCrow@his-phoenix-multics.arpa (Jerry Crow)
Newsgroups: net.micro.cpm
Subject: RE: Morrow MD2
Message-ID: <1380@brl-smoke.ARPA>
Date: Thu, 27-Feb-86 19:11:41 EST
Article-I.D.: brl-smok.1380
Posted: Thu Feb 27 19:11:41 1986
Date-Received: Mon, 3-Mar-86 01:14:51 EST
Sender: news@brl-smoke.ARPA
Lines: 29


        I'd  like  to do the same with the MD2; at least to get DSDD.  That
        should  just  mean  a  new  ROM if I stick to two drives; else some
        decoder  logic  changes.   The  M-C folks I talked to last week had
        never heard of such a thing.  Of course the MD3 does just that.

        Question:

             Anyone done any sort of upgrade to a MD2?

We have not upgraded MD2s per se, but we have added additional drives to an
MD3  to  bring the configuration up to a total of four drives (2 DS, 2 SS).
This  required  only  that several locations in the BIOS be patched; it did
not  require  a  ROM  change.   Note,  however,  that  the MD3 ROM has a DS
personality which is designed to permit the reading/writing of SS diskettes
in  the  DS  drives.  The process is "automatic"; i.e., the ROM responds to
the  presence  of  SS  diskettes  without user intervention.  I do not know
whether  a ROM change would be required to implement what you desire, but I
suspect not.  Our MD3s are running BIOS 3.1; the MD2s 2.3.

             Anyone have a Schematic for the MD2?

             Anyone  be  willing  to  copy  their MD3 ROM and determine any
             wiring diferences with the MD2 (i.e.  have a MD3 schematic?)?

I   believe  that  the  Morrow  Owners  Review  (MOG)  offers  a  technical
information  manual  on  the Morrow CP/M machines.  MOG is at P O Box 5437,
Berkeley  CA,  94705.   MOG  publishes a user oriented magazine of the same
name which is a good source of info about the Morrows.