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From: alfter@uns-helios.nevada.edu (SCOTT ALFTER)
Newsgroups: comp.sys.apple2
Subject: Re: Apple 5.25" Disk Questions
Message-ID: <2390@unsvax.NEVADA.EDU>
Date: 2 Dec 90 08:19:54 GMT
References: <901201122247.204030b1@VENUS.TAMU.EDU>
Sender: news@unsvax.NEVADA.EDU
Organization: University of Nevada System Computing Services
Lines: 39

In article <901201122247.204030b1@VENUS.TAMU.EDU> JDB8042@VENUS.TAMU.EDU (John D. Baker) writes:
>My current 5.25" drives are a pair of 1978-vintage Apple Disk ][s.
>What I would like to do is change my controller to the new style Apple
>5.25" controller (DB-19 connector) when I get new drives so that I
>won't have hard cables hanging out of the back of my //e.

You shouldn't need to change the controller as the Disk II controller
and the UniDisk/DuoDisk controller are identical, except for the
connectors.  You could easily make an adapter for your existing card
with a DB-19 connector, two 20-pin connectors, and a short length of
ribbon cable.  If you're interested, I'll send instructions, or
there's an article in _Open-Apple_ (I forgot which issue) that gives
pinouts for all the different drives.

>Would someone please clarify the following desciptions of various 5.25"
>disk drives that I see in ads and comment on the assumptions I have
>made about them?
>[...]
>AMR:  A.5 Half-Height (][+ & //e)     ;I assume 20-pin header conn.

Probably.

>      A.5C 1/2-Height (//c)           ;Sounds like DB-19, but can it
>				      ;have a 2nd drive attached?

The IIc only accepts one external drive, so it probably doesn't have a
daisy-chain connector.

>      A5 D 1/2-Height (][gs daisychain)  ; I have no idea what
>					 ; this means

Probably the same as the above, only they give you a daisy-chain
connector.

-----------------------------------------------------------------------------
Scott Alfter                             _/_
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Internet: alfter@uns-helios.nevada.edu (    ( the power to be your best!
   GEnie: S.ALFTER                      \_^_/