VT101 8085 CPU Fault

[Robert Jarratt]

No, I checked that and it isn't. It is an active low signal and it is high.

Regards

Rob

> -----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
> 
> >
> > 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
CPU
> being held reset all the time?
> 
> -tony
> =