Date   : Tue, 21 Jun 2005 21:21:57 +0100
From   : Ian K <BBCmail@...>
Subject: Re: A couple of questions - Econet & 1770 Disc Interface

In article <Pine.LNX.4.58.0506201645010.452@...>,
   Chris Johns <chris.johns@...> wrote:
> On Mon, 20 Jun 2005, Mike Howard wrote:

> > I also have an Issue 7 BBC/B who's history I know little about (I
> > believe it came from the Depatment Of Chemical Engineering at Nottingham
> > University) and cannot get the disc interface to work. I'm using a known
> > good floppy drive, known good disc interface, known good 7438s and the
> > link is fitted at IC86. IC87 is fitted with a 74LS123 but unfortunately
> > not socketed.

> You need to modify the 1770 interface to fit it if one of the ICs is
> present and not socketed. There is a pad on the corner of the interface,
> the track between the two pins needs to be broken and one side soldered to
> a pin on IC87.

> I don't recall the exact details, they should be in the 1770 fitting
> guide, I have a copy but its 200 miles away - I can find out when I'm next
> home if required.

I have a copy here, looking through you seem to of done everything except;
Have you cut the link S9 1 inch to the West of pin 1 of IC78.

Regards
Ian K