Date   : Wed, 15 Oct 2003 16:57:43 +0100
From   : Andrew Hancock <Andrew.Hancock@...>
Subject: Re: Two BBC Micros need some help!

 
I've managed to obtain two new and tested 1770 and 1772 to replace the duff
1770 on the 1770 Daughterboard in my Beeb.

When inserting the daughterboard in any standard Beeb with a working 1770
Interface it causes it to hang, no display, and a long beeb...........(if I
remove the 1770/1772 from the socket on the daughterboard Beeb behaves as
normal.

Do you think the three TTL chips are to blame, 74LS02, 74ALS00 and a
74LS173?

Andrew


> -----Original Message-----
> From: Mike Tomlinson [mailto:mike@...]
> Sent: 23 September 2003 04:40
> To: bbc-micro@...
> Subject: Re: [BBC-Micro] Two BBC Micros need some help!
> 
> In article <6A4F555CEA3CD5118DBD0002E30AC0912C07E0@...
> consultants.co.uk>, Andrew Hancock <Andrew.Hancock@...
> consultants.co.uk> writes
> >
> >Anyone know where I can get a replacement WD1770-PH or WD1772 to replace
> on
> >my daughter board.
> 
> It's now obsolete, so you'll have to get used.  The Atari ST and the
> Archimedes also used the 1770/1772 so you may be able to scrounge one
> off a dead board.  Try a post in the relevant newsgroups.
> 
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