Date   : Sun, 28 Sep 2003 02:23:08 +0100
From   : Mike Tomlinson <mike@...>
Subject: Re: BBC Micro lazy delayed boot!

In article <6A4F555CEA3CD5118DBD0002E30AC0912C0826@...
consultants.co.uk>, Andrew Hancock <Andrew.Hancock@...
consultants.co.uk> writes

>When the 8271 chip is inserted, if I power-on the Beeb, I get the first
>tone, flashing cursor and 4 seconds later the second tone and the Beeb
>boots, and displays usual BBC Computer 32K, Acorn DFS, Basic.

Strange.  Thoughts:

1.  How sure are you that the 8271 socket is OK (I'm thinking that the
pins on the 1770 upgrade riser may have loosened the socket a bit too
much.)

2.  Tried it with the DFS ROM unplugged?  What happens?

3.  Is link S9 (to the top and left of the 8271) cut?

4.  When you reverted from the 1770 disc kit to the 8271, did you refit
the two chips which are replaced with wire links in the 1770 kit?  One
is is86 (74LS393) and the other is ic87 (74LS123).

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