Date   : Thu, 27 Feb 1986 16:58:00 MST
From   : Jerry Crow <JCrow@his-phoenix-multics.arpa>
Subject: Re: Morrow MD2

        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.