21MX proms (per request

[dwight]

I was mistaken.
I've admitted it.
Dwight


> From: ard at p850ug1.demon.co.uk
> To: cctalk at classiccmp.org
> Subject: RE: 21MX proms (per request
> Date: Thu, 10 Sep 2015 19:15:42 +0000
> 
> > As often the case, I recall wrong.
> > I stand corrected.
> > Dwight
> > 
> > From: dkelvey at hotmail.com
> > To: cctalk at classiccmp.org
> > Subject: RE: 21MX proms (per request
> > Date: Thu, 10 Sep 2015 12:09:39 -0700
> > 
> > 
> > 
> > 
> > Yep, looked it up.
> > 2716 and 2732 used a pulsed Vpp( 2708 a well ).
> > Beyond that they had a static Vpp and a PGM pin.
> > Dwight
> 
> I am now totally confused. Do you believe the 2716 and 2732 require a Vpp pulse for each 
> location or not? 
> 
> FWIW, I believe they do not (confirmed by the data sheets I have found on the web). You can
> apply Vpp to get the thing into program mode and then apply a TTL-level 50ms pulse to 
> program a location. 
> 
> -tony