Connector hole in the back of (some?) Unix PCs? (for HD2?)
Dave Hanna
dave at dms3b1.uucp
Wed Oct 24 21:21:02 AEST 1990
In article <1990Oct22.233531.9378 at shibaya.lonestar.org> afc at shibaya.lonestar.org (Augustine Cano) writes:
>
>I'd really like to have a clean connection to the outside once I install
>John's HD2 board. Any counter-indications to have the external HDs
>plugged in into a suitable connector? Which connector would do?
>(hopefully it would fit into that cutout.) I'd be all for developing
>a net-wide standard pinout for such a connector that would allow access
>to all the hardware capabilities of John's board (1 external floppy and
>up to 4 HDs once the gd driver is suitably modified.)
One difficulty with that is that ST506/412 type drives require one
daisy-chain control cable that runs to all the drives, a la floppies,
but they also require a radial data cable that runs one to each drive.
That means you'd either need a lot of pins, or, four 4 drives, 5 cables.
>How is everybody else thinking of the external aspects of the HD2 upgrade?
>I have recently read in a local group that the cheap alternative (putting
>the external disk(s) in an AT box with an AT power supply) might not work
>very well. The person who tried this approach said that cooling was poor
>and the PS was not loaded enough to work properly with one drive.
I'm not sure about the cooling, but I was planning to use one, perhaps
with a smaller supply (e.g., the XT-type supplies are rated at about
135 watts, if I remember right, instead of the AT-type rated at 200 or
more), and pull the drive out of the 3b1. With them both mounted there,
that ought to be enough load on the supply.
>
>Comments, anyone?
>
>--
>Augustine Cano INTERNET: afc at shibaya.lonestar.org
--
Dave Hanna, Infotouch Systems, Inc. | "Do or do not -- There is no try"
P.O. Box 584, Bedford, TX 76095 | - Yoda
(214) 358-4534 (817) 540-1524 |
UUCP: ...!letni!dms3b1!dave |
More information about the Comp.sys.att
mailing list