Date   : Mon, 20 Jun 2005 16:29:43 +0100
From   : Andrew Benham <adsb@...>
Subject: Re: A couple of questions - Econet & 1770 Disc Interface

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.
> 
> If I do a *cat, the drive led lights up, the disc whirrs then nothing, 
> the led goes out and the beeb just sits there until I press ESCAPE. If I 
> do a *form 80 0 the led lights up, the disc whirrs, the initial 
> 'formatting track 00' message appears and then the beeb hangs again. 
> This time requiring a CTRL BREAK.

Is this a machine which you've added the disk interface to ?

If so, you haven't cut the link to enable NMI from the disk controller.

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

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