Homebrew Prom Programmer

This page goes back over 10 years and pertains to a programmer for XT, 286, etc computers. Spent so much time on this design I keep it as a fond memory. When Phillips discontinued manufacture of the bipolar proms interest quickly died. sigh

Build a homebrew bipolar prom programmer for Signetics 82S129 and 82S131 proms which uses your pc's parallel port.

artwork(190k jpg)
schematic(109k gif)
parts list
component placement(46k jpeg)


and after the board is built.
setup to adjust the 17 volt regulator
setup to adjust the 8 volt regulator

Jameco (Belmont California) perports to have Signetics bipolar proms but has been substituting some brand which does not program in my programmer. Soooo, private sources are it. Jameco is a good source for parts to build the programming board.

Note that Motorola originally used the MMI or National 74S series proms which NTE now has available. They require a totally different voltage/time for programming than do the Signetics. They are interchangeable on read but not in programming.