Ancient disk controllers - test-drb@ccmp.vtda.org

17 Apr 1999

--- Tony Duell &lt;ard(a)p850ug1.demon.co.uk&gt; 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.

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

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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