1 Jan
2018
1 Jan
'18
1:02 p.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Fred
Cisin
via cctalk
Sent: 01 January 2018 20:36
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at
classiccmp.org>
Subject: RE: ZX Spectrum Z80 Keeps Resetting
Is there a random element to the rebooting, or is it a fixed specific
pattern?
Consider, . . .
if some high order bits of the address are non-functional, then when it
goes to
location xxx000 , it starts over at 000000.
Not necessarily the most likely cause of the problem.
Unfortunately it is random. To a point. When I did my trace with the logic
analyser I could see it was in a RAM testing loop and would fail part way
through the loop, failing on an address that previously worked.
However, it manages to get past that bit and gets to the point where the
copyright message is displayed. But it always resets at that point. I have
not been able to capture that point in the address trace to see if it is a
consistent address, but maybe that is something I can try with a trace that
triggers on a stop condition. I will try that this evening.
Regards
Rob