Date   : Fri, 06 Aug 2010 16:39:20 +0100
From   : adsb@... (Andrew Benham)
Subject: schematic wanted

On 06/08/10 16:13, Rick Murray wrote:
> On 06/08/2010 14:47, Andrew Benham wrote:
> 
>> My unofficial diagram is at
>>     http://www.adsb.co.uk/bbc/disk_controllers/ddfs_v2.jpg
> 
> Mmmm... Check 8271 plug pins 27, 31, and 33. Surely you'd want an 
> overbar to donate active low signals on the left as well as the right?

Electrically you're right, but I'm using the pin labels from
the respective data sheets.
[ I hope I'm right, the Western Digital book was easy to find
  just now, heaven knows where the 8271 data sheet has got to. ]

-- 
Andrew Benham         adsb@...       
Southgate, London N14, United Kingdom

The gates in my computer are AND OR and NOT, not "Bill"