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Datzsheet think it would be a big deal to even used a C64 or less without too much effort. Then the remaining sixteen address inputs would come from the programmer.

Someone recently tried hooking up a static RAM chip to an Arduino with some shift registers. These chips were really intended to be programmed in place.

If you’re unable to make this work then it probably indicates a defective at29ca or some other underlying issue. Ok, I will keep that in mind when I post up the boards after soldering the components.

(PDF) 28C512 Datasheet download

It is failing because it won’t erase. Do you know of a project that has already accomplished this feat? You can link to a specific post using the little icon to the left of Posted: Select a forum I don’t want to reinvent the wheel for something that I’m sure has been done before.

I seem to find many posts about Ic2 eeproms and SPI eeproms, but not parallel eeproms. 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.


Dwight I’ve message rpress about the reading issue. Users browsing this forum: Fri Jul 14, 3: I don’t use a programmer, I just use the on my KIM-1 and program it in place. Here are some pictures in the mean time: It has worked before on their boards.

However, after doing several searches, including reading several posts about interfacing with eproms, I have yet to find a solution. Schematic is on page 8 and fourth post down. Thank you for your quick reply John. I also got it looking close to what unaclocker had. Fri Jul 14, But the regular dip socket will be fine for me as i have a ic puller. Rpress has created the circuit to program the 27xXxX chips. The 28Cxx parts have a built in charge pump circuit to create their programming voltage.

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


Sat Jul 15, 6: Did you check capacitor polarity? 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. Next step would be my soldering. So even though it says it wrote the data, it shows as nothing has changed.


Can you post the schematic?

View 28c512-513 datasheet:

Will report back when soldered and tested. I think 285c12 jest of my post was lost. Mon Dec 31, 1: Thu May 04, 9: You might check the data sheet for this chip. I use a 28C64 on my to adapter.

As long as the Vpp is right, it should work. Gonna solder 2 more boards, one with hot air soldering and one with my reflow oven. I’ve double tripled check my traces and everything goes where it should.

HTH — good luck! In any datashedt, if I understand right you are using an arduino.

There’d be no need for hardware or software to support a bit address, so datsaheet options could be omitted or temporarily bypassed. It might not have a proper connection.

I see no schematic there? Page 15 of It sounds like you need to write some board test programs to measure and verify things without a flash chip in the socket. You need a LOT of pins to control the 15 address pins, 8 data pins and the adtasheet control pins. Can any one steer me to the right direction. Haven’t soldered anything yet but will this weekend.