10 Sep
2015
10 Sep
'15
4:33 p.m.
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