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In any case, if I understand right you are using an arduino.

28C Datasheet, PDF – Alldatasheet

Fri Jul 14, 3: When you verify, does it show you the value read? Dr Jefyll, Google [Bot] and 2 guests. 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.

In the last photo, i did not account for the zif socket size as i ordered the socket after i had submitted the gerbers.

(PDF) 28C512 Datasheet download

Did you check capacitor polarity? I see no schematic there?

The forum software will automatically show a reasonably-sized preview. I don’t want to reinvent the wheel for something that I’m sure has been done before. Sat Jul 15, 9: Dattasheet might not have a proper connection. No need to make a special programmer.


I’ve made some boards based on the optimized version that rpress did. There’d be no need for hardware or software to support a bit address, so these options could be omitted or temporarily bypassed. One should use the levels stated in the table and not the diagram.

View 28c512-513 datasheet:

If you’re unable datasbeet make this work then it probably indicates a defective at29ca or some other underlying issue. Everything goes smoothly had a finicky USB wire connecting to my Leonardo and uno but i am getting a failure for the verifying part. I’d think it would be a big deal to even used a C64 or less without too much effort.

Fri Jul 14, It’s best if you do attach images, but if they are big, better not to inline them. So even though it says it wrote the data, it shows as nothing has changed. Download the data sheet to see how to address, read, and write to the chip. Send Bitcoin tips to: Sat Jul 15, 1: Sat Jul 15, 2: The caps and solder for them were exactly the same size.


Fri Jul 14, 4: Next step would be my soldering.

28C 28C parallel eeproms

Then the remaining sixteen address inputs would come from the programmer. Welcome, Universal One thing you could datasheeet is treat the at29ca k chip as a 64 k chip by tying address input A16 high or low. Select a forum I seem to find many posts about Ic2 eeproms and SPI eeproms, but not parallel eeproms. Haven’t soldered anything yet but will this weekend. Rpress has created the circuit to program the 27xXxX chips.

Sat Jul 15, 6: Dwight, there is a charge pump circuit on the boards. Previous topic Next topic. Here are some pictures in the mean time: Can any one steer me to the right direction. Thu May 04, 9: Thu May 04, 6: You can only flip bits one way by writing, unlike the 28C parts.