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Datasheef you verify, does it show you the value read? It does need you to erase them before programming. It might not have a proper connection. I see no schematic there?

(PDF) 28C512 Datasheet download

Dr Jefyll, Google [Bot] and 2 guests. Dwight, there is a charge pump circuit on the boards. But the regular dip socket will be fine for me as i have a ic puller. In the last photo, i did not account for datzsheet zif socket size as i ordered the socket after i had submitted the gerbers.

org • View topic – 28Cxxx EEPROM Programmer

Two things arise from this. So even though it says it wrote the data, it shows as nothing has changed. There’d be no need for hardware or software to support a bit address, so these options could be omitted or temporarily bypassed. Page 15 of One should use the levels vatasheet in the table and not the diagram. I think the jest of my post was lost.


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. You can link to a specific post using the little icon to the left of Posted: Fri Jul 14, 3: You might check the data sheet for this chip. You can only flip bits one way by writing, unlike the 28C parts.

The caps and solder for them were exactly the same size. Sat Jul 15, 1: You cannot post 28c51 topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum.

Thu May 04, 6: I have everything soldered on one board.

These chips were really intended to be programmed in place. Schematic is on page 8 and fourth post down. Welcome, Universal One thing you could do is treat datashret at29ca k chip as a 64 k chip by tying address input A16 high or low. I don’t want to reinvent the wheel for something that I’m sure has been done before.


The programming isn’t too complicated. Next step would be my soldering.

Can you post the schematic? Gonna solder 2 more boards, one with hot air soldering and one with my reflow oven. These parallel eeproms are old technology. It’s best if you do attach images, but if they are big, better not to inline them. I’m so sorry to post about something obvious.

I’ve made some boards based on the optimized version that rpress did.