Date   : Mon, 25 Sep 2000 20:37:30 +0100
From   : Philip Blundell <philb@...>
Subject: Re: 1770 disc interface 

>Can one do a straight swap WD1770PH for WD1772PH?

Yes.

>does the ADFS rom require the DFS rom to be present to work?

No.

>As well as the 1770 module, the Acorn installation guide specifies that '2 off
>7438 Integrated Circuits' are required for the 14 pin DIL sockets at IC79 and
>IC80. Is the Texas Instruments SN7438N suitable for this?

Yes, they should be fine.  They have to be 7438 as opposed to 74LS38, etc, but 
it's a fairly generic part.

p.