> 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