Ancient disk controllers

From: Richard Erlacher <edick_at_idcomm.com>
Date: Sun Apr 18 00:01:32 1999

see below, please.

Dick

-----Original Message-----
From: Ethan Dicks <ethan_dicks_at_yahoo.com>
To: Discussion re-collecting of classic computers <classiccmp_at_u.washington.edu>
Date: Saturday, April 17, 1999 8:17 PM
Subject: Re: Ancient disk controllers


>
>
>--- Tony Duell <ard_at_p850ug1.demon.co.uk> wrote:
>
>> > The final connector, J6 is 50 pins.
>> >
>> Which pins are used on the 50 pin connector? Could it be pinned out as a
>> SCSI port. Or is it possibly some custom host interface?
>
>It could be a custom host interface. Among other anomalies, I don't see
>any terminating resistors.
>
>> For example I
>> have here the data sheet for the WD1001 controller. It uses essentially
>> the chipset you mentioned. It has a 50 pin host connector, but it sure
>> ain't SCSI.
>
>Can you scan that data sheet or send me a photocopy? I'd pay for
>copying/mailing.
>
>> 20MHz/4 = 5MHz = standard ST506 data rate.
>
>Right. It's the right rate for an 8" disk.


Nope, it's not! the right rate for 8" Winchesters is 4.34 MHz!

>> 8MHz is a common enough clock for the 8x300 series of CPUs as well.


That's true enough.

>OK.
>
>> What bothers me, if this _is_ a SCSI controller is that there seems to be
>> no way of setting the device address.
>
>No place that I can see.
>
>> My guess is that it's a sort-of WD1001 clone.


It predated the WD1001 by some time.

>OK. That makes sense. In fact, when I read the recent debates of
>WD1001's, I thought of this board. I didn't think I could find it
>as fast as I did. It could have been packed a lot deeper than it
>was.
>
>Thanks for the insights.
>
>-ethan
>
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