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Gonna solder 2 more boards, one with hot air soldering and one with my reflow oven. Did you check capacitor polarity? I should note that the data sheet I saw had the incorrect timing diagram for reading the value. HTH — good luck! However, after doing several searches, including reading several posts about interfacing with eproms, I have yet to find a solution.

org • View topic – 28Cxxx EEPROM Programmer

I think the jest of my post was lost. Sat Jul datazheet, 9: You can link to a specific post using the little icon to the left of Posted: I’ve made some boards based on the optimized version that rpress did. Just wanted to say thanks to rpress and marc to helping with the schematic on this programmer.

So even though it says it wrote the data, it shows as nothing has changed. Haven’t soldered anything yet but will this weekend. Send Bitcoin tips to: I’ve double tripled check my traces and everything goes where it should. In any case, if I understand right you are using an arduino. It has worked before on their boards. Two things arise from this. Users browsing this forum: The 28Cxx parts have a built in charge pump circuit to create their programming voltage. Thu May 04, 6: These chips were really intended to be programmed in place.


You cannot post new datashee 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 285c12 attachments in this forum. You can only flip bits one way by writing, unlike the 28C parts. I’d think it would be a big deal 82c512 even used a C64 or less without too much effort. Previous topic Next dataxheet.

It is failing because it won’t erase. You need a LOT of pins to control the 15 address pins, 8 data pins and the various control pins. Here are some pictures in the mean time: Ok, I will keep that in mind when I post up the boards after soldering the components.

Fri Jul 14, 3: Everything goes smoothly had a finicky USB wire connecting to my Leonardo and uno but i am getting a failure for the verifying part.

Dwight, there is a charge pump circuit on the boards. No need to make a special programmer.

28C512 Datasheet PDF

You might check the data sheet for this chip. Someone recently tried hooking up a static RAM chip to an Arduino with some shift registers. But the regular dip socket will be fine for me as i have a ic puller. 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.


These parallel eeproms are old technology. Next step would be my soldering. Fri Jul 14, Unlike the 28C, these need 12V applied to the correct pins to program. Welcome, Universal One thing you could do is treat the at29ca k chip as a 64 k chip by tying address input A16 high or low. The programming isn’t too complicated.

Thu Jul 13, Schematic is on page 8 and fourth post down. One should use the levels stated in the table and not the diagram. I don’t use a programmer, Datasheeet just use the on datashdet KIM-1 and program it in place.

I have everything soldered on one board.

When you verify, does it show you the value read? Thank you for your quick reply John.

I see no schematic there? I don’t want to reinvent the wheel for something that I’m sure has been done before.