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Rpress has created the circuit to program the 27xXxX chips.

(PDF) 28C512 Datasheet download

Send Bitcoin tips to: In the last photo, i did not account for the zif socket size as i ordered the socket after i had submitted the gerbers. You can only flip bits one way by writing, unlike the 28C parts. Select a forum Someone adtasheet tried hooking up a static RAM chip to an Arduino with some shift registers.

When you verify, does it show you the value read? As long as the Vpp is right, it should work. Do you know of a project that has already accomplished this feat? Users browsing this forum: Fri Jul 14, 4: Sat Jul 15, 1: Schematic is on page 8 and fourth post down. Dwight, there is a charge pump circuit on the boards. It is failing because it won’t erase.


Sat Jul 15, 2: Haven’t soldered anything yet but will this weekend. I don’t want to reinvent the wheel for something that I’m sure has been done before.

View 28c512-513 datasheet:

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I’m so sorry to post about datasheett obvious. Thank you so much Mario. The 28Cxx parts have a built in charge pump circuit to create their programming voltage.


It does need you to erase them before programming. In other words bypassing your bit mod’s allows you to isolate certain parts of the problem — which of course is a fundamental troubleshooting technique. Can you post the dataasheet The programming isn’t too complicated. I seem to find many posts about Ic2 eeproms and SPI eeproms, but dagasheet parallel eeproms.

However, after doing several searches, including reading several posts about interfacing with eproms, I have yet to find a solution.

28C 28C parallel eeproms

You need a LOT of pins to control the 15 address pins, 8 data pins and the various control pins. But the regular dip socket will be fine for me as i have a ic puller.


I also got it looking close to what unaclocker had. You might check the data sheet for this chip. Thu May 04, 6: Dwight I’ve message datqsheet about the reading issue. It might not have a proper connection. I don’t use a programmer, I just use the on my KIM-1 and program it in place. I think the jest of my post was lost. In any case, if I understand right you are using an arduino.

Polarity on the capacitors are correct. If you’re unable to make this work then it probably indicates a defective at29ca or some other underlying 28c12.

I am 28d512 this programmer just to program the 27sf chips. It sounds like you need to write some board test programs to measure and verify things without a flash chip in the socket. Everything goes smoothly had a finicky USB wire connecting to my Leonardo and uno but i am getting a failure for the verifying part.