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I have everything soldered on one board. I’d think it would be a big deal to even used a C64 or less without too much effort. However, after doing several searches, including reading several posts about interfacing with eproms, I have yet to find a solution.

There’d be no need for hardware or software to support a bit address, so these options could be omitted or temporarily bypassed. Two things arise from this. As a temporary, workaround solution it would allow you to program the chip although rather inconveniently in two separate passes. 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. Fri Jul 14, 4: The 28Cxx parts have a built in charge pump circuit to create their programming voltage.

These chips were really intended to be programmed in place. I’ve made some boards based on the optimized version that rpress did. But the regular dip socket will be fine for me as i have a ic puller. 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.


So even though it says it wrote the data, it shows as nothing has changed.

HTH — good luck! I also got it looking close to what unaclocker had. You can link to a specific post using the little icon to the left of Posted: Dwight I’ve message rpress about the reading issue.

Schematic is on page 8 and fourth post down. Thank you for your quick reply John. You can only flip bits one way catasheet writing, unlike the 28C parts. You cannot post new 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. Sat Jul 15, Someone recently tried hooking up a static RAM chip to an Arduino with some shift registers. That should make datasgeet possible to use the chip without needing a Mega for the extra pins.

In any case, if I understand right you are using an arduino. Polarity on the capacitors are correct.

Did you check capacitor polarity? The caps and solder for them were exactly the same size.

28C Datasheet PDF – ON Semiconductor

It sounds like you need to write some board test programs to measure and verify things without a flash chip in the socket. Thu May 04, 6: In the last photo, i did not account for the zif socket size as i ordered the socket after i had submitted the gerbers.


Send Bitcoin tips to: Unlike the 28C, these need 12V applied to the correct pins to program. I think the jest of my post was lost. The forum software will automatically show a reasonably-sized preview.

(PDF) 28C512 Datasheet download

Do you know of a project that has already accomplished this feat? Sat Jul 15, 9: Users browsing this forum: Can any one steer me to the right direction. Download the data sheet to see how to address, read, and write to the chip. Ok, I will keep that in mind when I post up the boards after soldering the components.

I use a 28C64 on my to adapter.

Next step would be my soldering. Sat Jul 15, 2: It’s best if you do attach images, but if they are big, better not to inline them. Can you post the schematic?

I am using this programmer just to program the 27sf chips. Fri Jul 14, 3: When you verify, does it show you the value read? 288c512 15 of