Date   : Fri, 16 Apr 2010 17:30:08 +0100
From   : mike@... (Mike Tomlinson)
Subject: Dead beeb - easy tests

In article <577c15aae858fd6fb191d0b353f7b855.squirrel@...
ass.org>, beeb@... writes

>Hmm ... I have a couple of beebs with suspected RAM faults, and I've
>wondered before: is there a simple BASIC routine I can try that will
>highlight faults at certain addresses, so I can track the fault down to a
>particular RAM IC? Or if not a BASIC program, then something I could get
>put on a sideways ROM to install in suspect computers?

Watford Diagnostics does a memory test.  Disc image on the nearest BBC
archive to you.

Or:

10 MODE 2
20 REP. GCOL 0,RND(15)
30 PLOT 85, RND(1279),RND(1024)
40 PRINT "ON TEST"
50 UNTIL 0

Draws multi-coloured triangles all over the screen, which scrolls.  It's
quite a severe test of the upper 16k of memory - any faults will be
obvious.

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