toftat@cowshed.8m.com wrote :

> > I'm currently trying to get a similar unit (GU128X32-311) running,
> > and it also have a CS line that I was planning to set CS hard "low".
> 
> I have let this float, but I can set it hard one way or the 
> other, I will do this later tonight.

I would not let an input to the VFD module "float". If the input doesn't
have any pull up/down resistor (so it's high-Z), it will pick up
50/60 Hz "hum" and all kinds of nasty things could happen !
And MPLAB SIM would have a *very* hard time to simulate that :-) :-)


I have just got the GU128X32-311 running, using the CS line
connected hard to GND. Now, the par interface on this unit is a little
different then the one on the T23A. E.g the data lines are "lached"
on the falling edge of the WR line, so they have to be setup *before*
setting WR low. So we don't know if they "use" the CS line in the
same ways. 

> 
> > Is there anything connected to the "Programming" connector ?
> 
> Most of the time my Wisp628 is connected, it makes no 
> difference connected or
> not, I usually leave it connected but have disconnected to 
> see if it helped.

OK. Didn't know what you had there. The Wisp628 usualy
does a god job in disconnecting itself from the target curcuit.

Currently I would strongly suspect the floating CS !


>From your other mail :
> I just got reply from Noritake, they say that WR and CS
> should follow each other...

Does that say that you can "feed" them from the same pin ?
That would save a pin...

Jan-Erik.

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