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Today's Topics:
1. Odd problems with a QL and Trump Card (Rich Mellor)
----------------------------------------------------------------------
Message: 1
Date: Sat, 27 Mar 2010 13:24:29 +0000
From: Rich Mellor <r...@rwapservices.co.uk>
To: ql-us...@q-v-d.com
Cc: Howard <howard.thom...@ntlworld.com>
Subject: [Ql-Users] Odd problems with a QL and Trump Card
Message-ID: <4bae070d.7060...@rwapservices.co.uk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I have a customer who purchased a second hand QL off ebay and a Trump
Card from me.
The QL was in a poor state and would not start - but he fetched all
the chips out and reseated them, so it starts fine.
However, as soon as he plugged the Trump Card into the machine - it
gets through the chequer-board memory test - then comes up with a
grey screen.
The PSU seemed under powered, so he has replaced the PSU and the
Trump Card + QL then started fine a couple of times.
However, having left the computer and Trump Card for a few days - he
is back to the same problem on start-up
Does anyone have any suggestions as to what this may be - I wonder if
it could be the 68008 chip??
back in the days of yore, we used to 'cure' QL's with marginal power
problems by replacing the 2 ROM's with a CMOS EPROM, really dropped
the milliamp draw of the QL's power supply bits. Somewhere in the
back of my mind it seems that it reduced the total draw by up to 30%
Actually, replacing the JS ROMs by a Minerva allowed the QL with trump
card to start up but it only reported 640K in the end (after displaying
the huge numbers on screen) so I guess there is a memory fault on the
Trump Card. Odd that it started fine on my QL...
Minerva with just the standard QL did not report any errors, so we know
it is the Trump Card.
Is there a way of interpreting the numbers displayed by Minerva to
ascertain which chip is faulty? Possibly not as the numbers seem to be
different every time!
--
Rich Mellor
RWAP Services
http://www.rwapsoftware.co.uk
http://www.rwapservices.co.uk
-- Try out our new site: http://sellmyretro.com
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