Rich Mellor wrote, On 27/03/10 13:24:
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??
Try a new 8301 first.
If not that, put a Minerva in - it may be faulty ram and Minerva will
flag that.
The QLs memory test with Sinclair roms is very deficient. It cannot
detect a fault if a zero is written. Minerva seeds the ram test
pattern, so will eventually find a faulty bit, even if not the first
time(s).
There was a classic example when Quanta released the free version of QL
Terminal. Phil Borman used a Trump Card based machine to do the
copying, from ram. QLT ran, but crashed if anyone tried to change the
directory. It emerged that his TC had one faulty bit, and that was in
the middle of his QLT copy!
Tony
--
QBBS (QL fido BBS 2:257/67) +44(0)1442-828255
[email protected] http://firshman.co.uk
Voice: +44(0)1442-828254 Fax: +44(0)1442-828255 Skype: tonyfirshman
TF Services, 29 Longfield Road, TRING, Herts, HP23 4DG
_______________________________________________
QL-Users Mailing List
http://www.q-v-d.demon.co.uk/smsqe.htm
