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Haven’t soldered anything yet but will this weekend. Thank you so much Mario. I should note that the data sheet I saw had the incorrect timing datasheett for reading the value.

28C 28C parallel eeproms

One should use the levels stated in the table and not the diagram. Did you check capacitor polarity?

Sat Jul 15, 6: Fri Jul 14, Here are some pictures in the mean time: Send Bitcoin tips to: I don’t use a programmer, I just use the on my KIM-1 and program it in place. Two things arise from this.

Fri Jul 14, 4: Thu May 04, 6: Mon Dec 31, 1: I don’t want to reinvent the wheel for something that I’m sure has been done before. There’d be no need for hardware or software to support a bit address, so these options could be omitted or temporarily bypassed. Download the data sheet to see how to address, read, and write to the chip. It does need you to erase them before programming.


The forum software will automatically show a reasonably-sized preview. Then the remaining sixteen address inputs would come from the programmer. It’s best if you do attach images, but if they are big, better not to inline them. Ok, I will keep that in mind when I post up the boards after soldering the components.

28C512 Datasheet PDF

Do you know of a project that has already accomplished this feat? Can you post the schematic? I use a 28C64 on my to adapter. I’m so sorry to post about something obvious. Page 15 of Dr Jefyll, Google [Bot] and 2 guests.

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.

I am using this programmer just to program the 27sf chips. Rpress has created the circuit datasheer program the 27xXxX chips. Datasneet topic Next topic.

In other words bypassing your bit mod’s allows you to datashfet certain parts of the problem — which of course is a fundamental troubleshooting technique.

Polarity on the capacitors are correct. You can only flip bits one way by writing, unlike the 28C parts. It has worked before on their boards. It might not have a proper connection.


(PDF) 28C512 Datasheet download

The caps and solder for them were exactly the same size. It is failing because it won’t erase. So even though it says it wrote the data, it shows as nothing has changed. Unlike the 28C, these need 12V applied to the correct pins to program.


Schematic is datashewt page 8 and fourth post down. Everything goes smoothly had a finicky USB wire connecting to my Leonardo and uno but i am getting a failure for the verifying part. That should make it possible to use the chip without needing a Mega for the extra pins.

Sat Jul 15, 2: I’ve made some boards based on the optimized version that rpress did. You need a LOT of pins to control the 15 address pins, 8 data pins and the various control pins. I seem to find many posts about Ic2 eeproms and SPI eeproms, but not parallel eeproms.