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Can you post the schematic? Thu Jul 13, You need a LOT of pins to control the 15 address pins, 8 data pins and the various control pins. It sounds like you need to write some board test programs to measure dataseet verify things without a flash chip in the socket. Sat Jul 15, 2: If you’re unable to make this work then it probably indicates a defective at29ca or some other underlying issue. Just wanted to say thanks to rpress and marc to helping with the dtaasheet on this programmer.

It does need you to erase them before programming. Thank you so much Mario. I use a 28C64 on my to adapter.

View 28c512-513 datasheet:

Schematic is on page 8 and fourth post down. Someone recently tried hooking up a static RAM chip to an Arduino with some shift registers.


HTH — good luck! Thank you for your quick reply John. Everything goes smoothly had a finicky USB wire connecting to my Leonardo and uno but i am getting a failure for the verifying part. It is failing because it won’t erase. It might not have a daatasheet connection. I’ve double tripled check my traces and everything goes where it should.

You might check the data sheet for this chip. Did you check capacitor polarity? Thu May 04, 9: Thu May 04, 6: I’d think it would be a big deal to even used a C64 or less without too much effort. Gonna solder 2 more boards, one with hot air adtasheet and one with my reflow oven. Dr Jefyll, Google [Bot] and dahasheet guests. Then the remaining sixteen address inputs would come from the programmer.

Unlike the 28C, these need 12V applied to the correct pins to program. The forum software will automatically show a reasonably-sized preview.

28C Datasheet PDF – ON Semiconductor

When you datashedt, does it show you the value read? So even though it says it wrote the data, it shows as nothing has changed. As a temporary, workaround solution dxtasheet would allow you to program the chip although rather inconveniently in two separate passes.


Dwight, there is a charge pump circuit on the boards. I think the jest of my post was lost. I’ve made some boards based on the optimized version that rpress did.

Previous topic Next topic. That should make it possible to use the chip without needing a Mega for the extra pins. It’s best if you do attach images, but if they are big, better not to inline them. Polarity on the capacitors are correct.

However, after daatasheet several searches, including reading several posts about interfacing with eproms, I have yet to find a solution. I have everything soldered on one board. Do you know of a project that has already accomplished this feat? 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. Ok, I will keep that in mind when I post up the boards after soldering the components.