21MX proms (per request

tony duell ard at p850ug1.demon.co.uk
Thu Sep 10 13:29:31 CDT 2015

> Your right, I didn't say that the 2716 was not a single rail, just that it
> didn't have a separate Vpp and PGM pin. It was programmed by turning
> Vpp on and off. I could be wrong that the 2732s were that way as well.

The data sheet for the SGS-Thomson 2716 here : 


says that you apply Vpp and keep it applied, set up address and data (with G/, pin 20, more
commonly called output enable, high and E/P low) and then program each location by taking the E/P pin
(Pin 18, more commonly called chip enable) high for 50ms. 

That is what I remember doing. You didn't have to pulse Vpp.


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