18 Jan
2015
18 Jan
'15
12:37 p.m.
No stuck, high.
Regards
Rob
--
Dentopedalogy is the science of opening your mouth and putting your foot in it.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Bob
Rosenbloom
Sent: 18 January 2015 20:11
To: General at classiccmp.org; Discussion at classiccmp.org:On-Topic and Off-
Topic Posts
Subject: Re: VT101 8085 CPU Fault
On 1/18/2015 12:07 PM, Robert Jarratt wrote:
> No, I checked that and it isn't. It is an active low signal and it is
high.
Regards
Rob
What about the READY pin? Stuck low?
Bob
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of tony
duell
Sent: 18 January 2015 19:16
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: VT101 8085 CPU Fault
CPU
The terminal controller board on my VT101 is not
working, if it
displays anything it is random characters. I have used my scope to
check the 8085 CPU. It has power, it is outputting a valid clock,
but there is no activity on the RD,WR and ALE pins. I am guessing
the 8085 is bad, but before I go replacing it I wanted to check if
anyone knew of anything else that might cause the 8085 to misbehave
(ie am I seeing
symptoms or a cause?).
What is the state of the reset input to the 8085? In other words, is
the being held reset all the time?
-tony
=
I've been practising it for years.
-Prince Philip