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It is failing because it won’t erase. That should make it possible to use the chip without needing a Mega for the extra pins. Fri Jul 14, 3: I use a 28C64 on my to adapter. The 28Cxx parts have a built in charge pump circuit to create their programming voltage. Fri Jul 14, Someone recently tried hooking up a static RAM 228c512 to an Arduino with some shift registers. Select a forum Haven’t soldered anything yet but will this weekend. Ok, I will keep that in mind when I post up the boards after soldering the components.
I am using this programmer just to program the 27sf chips. The forum software will automatically show a reasonably-sized preview. So even though it says it wrote the data, it shows as nothing has changed. Fri Jul 14, 4: I don’t want to reinvent the wheel for something that I’m sure datashwet been done before. It does need you to erase them before programming. Can you post the schematic? You need a LOT of pins to control the 15 address pins, 8 data pins and the various control pins.
(PDF) 28C512 Datasheet download
Thu May 04, 9: Can any one steer me to the right direction. You can use shift registers for the address lines and a universal shift register for the data lines. Previous topic Next topic. It might not have a proper connection. You might check the data sheet for this chip. Will report back when soldered and tested.
I’m so sorry to post about something obvious. Dwight I’ve message rpress about the reading issue. As a temporary, workaround solution it would allow you to program the chip although rather inconveniently in two separate passes. These chips were really intended to be programmed in place. Sat Jul 15, 6: However, after doing several searches, including reading several posts about interfacing with eproms, I have yet to find a solution.
28C512 Datasheet PDF
I have everything soldered on one board. Sat Jul 15, If you’re unable to make this work then it probably indicates a defective at29ca or some other underlying issue. Dr Jefyll, Google [Bot] and 2 guests. Then the remaining sixteen address inputs would come from the programmer. As long as the Vpp is right, it should work. Page 15 of You can only flip bits one way by writing, unlike the 28C parts.
Download the data sheet to see how to address, read, and write to the chip. Thank you for your quick reply John. Next step would be my soldering. In other words bypassing your bit mod’s allows you to isolate certain parts 82c512 the problem — which of course is a fundamental troubleshooting technique.
HTH — good luck! No need to make a special programmer.
In the last photo, i did not account for the zif socket size as i ordered the socket after i had submitted the gerbers. I see no schematic there?
The caps and solder for them were exactly the same size.
org • View topic – 28Cxxx EEPROM Programmer
Unlike the 28C, these need 12V applied to the correct pins to program. It’s best if dtasheet do attach images, but if they are big, better not to inline them. Thu Jul 13, Everything goes smoothly had a finicky USB wire connecting to my Leonardo and uno but i am getting a failure for the verifying part.
Just wanted to say thanks to rpress and marc to helping with the schematic on this programmer. Sat Jul 15, 9: