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I also got it looking close to what unaclocker had. I’d think it would be a big deal to even used a C64 or less without too much effort.

Ok, I will keep that in mind when I post up the boards after soldering the components. I don’t want to reinvent the wheel for something that I’m datashewt has been done before. Will report back when soldered and tested.

28C datasheet & applicatoin notes – Datasheet Archive

You can only flip bits one way by writing, unlike the 28C parts. Can any one steer me to the right direction. These chips were really intended to be programmed in place. Everything goes smoothly had a finicky USB wire connecting to my Leonardo and uno but i am getting a failure for the verifying part. Haven’t soldered anything yet but will this weekend. So even though it says it wrote the datashret, it shows as nothing has changed.


Rpress has created the circuit to program the 27xXxX chips. Schematic 28v512 on page 8 and fourth post down. No need to make a special programmer.

However, after doing several searches, including reading several posts about interfacing with eproms, I have yet to find a solution. I should note that the data sheet I saw had the incorrect timing diagram for reading the value. Thu May 04, 9: Datasheft parallel eeproms are old technology. Send Bitcoin tips to: Welcome, Universal One thing you could do 28c51 treat the at29ca k chip as a 64 k chip by tying address input A16 high or low.

org • View topic – 28Cxxx EEPROM Programmer

Here are some pictures in the mean time: As a temporary, workaround solution it would allow you to program the chip eatasheet rather inconveniently in two separate passes.

As long as the Vpp is right, it should work.

You can use shift registers for the address lines and a universal shift register for the data lines. Previous topic Next topic. One should use the levels stated in the table and not the diagram.

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View 28c512-513 datasheet:

Dwight, there is a charge pump circuit on the boards. Next step would be my soldering. I have everything soldered on one board. That should make it possible to use the chip without needing a Mega for the extra pins.

(PDF) 28C512 Datasheet download

Sat Jul 15, 6: The 28Cxx parts have a built in charge pump circuit to create their programming voltage. You might check the data sheet for this chip. Thu Jul 13, Polarity on the capacitors are correct.

Do you know of a project that has already accomplished this feat? It has worked before on their boards. When you verify, does it show you the value read?

I’m so sorry to post about something obvious. Sat Jul 15, 2: Sat Jul 15, Users browsing this forum: You need a LOT of pins to control the 15 address pins, 8 data pins and the various control pins.