I was mistaken. I've admitted it. Dwight
> From: a...@p850ug1.demon.co.uk > To: cctalk@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: dkel...@hotmail.com > > To: cctalk@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