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I don’t use a programmer, I just use the on my KIM-1 and program it in place.

Sat Jul 15, 2: Fri Jul 14, 3: Unlike the 28C, these need 12V applied to the correct pins to program. These chips were really intended to be programmed in 28c521. Users browsing this forum: Can you post the schematic?

I am using this programmer just to program the 27sf chips. The programming isn’t too complicated. These parallel eeproms are old technology. You might check the data sheet for this chip. Sat Jul 15, 1: It might not have a proper connection. The caps and solder for them were exactly the same size. Just wanted to say thanks to rpress and marc to helping with the schematic on this programmer.


Sat Jul 15, 6: Sat Jul 15, 9: You can use shift registers for the address lines and a universal shift register for the data lines. I think the jest of my post was lost.

Select a forum Did you check capacitor polarity? HTH — good luck! Someone recently tried hooking up a static RAM chip to an Arduino with some shift registers. Will report back when soldered and tested.



Can any one steer me to the right direction. I’ve double tripled check my traces and everything goes where it should. It has worked before on their boards. I don’t want to reinvent the wheel for something that I’m sure has been done before. It does need you to erase them before programming.

Rpress has created the circuit to program the 27xXxX chips. So even though it says it wrote the data, it shows as nothing has changed. I seem to find many posts about Ic2 eeproms and SPI eeproms, but not parallel eeproms.

It is failing because it won’t erase. There’d be no need for hardware or software to support a bit address, so these options could be omitted or temporarily bypassed. As a temporary, workaround solution it would allow you to program the chip although rather inconveniently in two separate passes.


In other dayasheet bypassing your bit mod’s allows you to isolate certain parts of the problem — which of course is a fundamental troubleshooting technique.

Next step would be my soldering. Thu May 04, 6: The forum software will datashfet show a reasonably-sized preview. Haven’t soldered anything yet but will this weekend. Thank you so much Mario.

View 28c512-513 datasheet:

Schematic is on page 8 datazheet fourth post down. Send Bitcoin tips to: If you’re unable to make this work then it probably indicates a defective at29ca or some other underlying issue.

You need a LOT of pins to control the 15 address pins, 8 data pins and the various control pins. I’ve made some boards based on the optimized version that rpress did.

I have everything soldered datssheet one board. It sounds like you need to write some board test programs to measure and verify things without a flash chip in the socket. Polarity on the capacitors are correct. I see no schematic there?