21MX proms (per request

[tony duell]

> 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