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Thu May 04, 9: Then the remaining sixteen address inputs would come from the programmer. Will report back when soldered and tested.

(PDF) 28C512 Datasheet download

I’m so sorry to post about something obvious. I don’t want to reinvent the wheel for 228c512 that I’m sure has been done before. So even though it says it wrote the data, it shows as nothing has changed. Sat Jul 15, 1: You can only flip bits one way by writing, unlike the 28C parts.

View 28c512-513 datasheet:

Fri Jul 14, 3: 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. I seem to find many posts about Ic2 eeproms and SPI eeproms, but not parallel eeproms. Select a forum 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.


Fri Jul 14, I also got it looking close to what unaclocker had. But the regular dip socket will be fine for me as i have a ic puller. You can use shift registers for the address lines and a universal shift register for the data lines. The forum software will automatically show a reasonably-sized preview. Rpress has created the circuit to program the 27xXxX chips.

Dwight I’ve message rpress about the reading issue. I don’t use a programmer, I just use the on my KIM-1 and program it in place. I see no schematic there? Dr Jefyll, Google [Bot] and 2 guests.

Mon Dec 31, 1: Users browsing this forum: Sat Jul 15, It’s best if you do attach images, but if they are big, better not to inline them.

Thu May 04, 6: As a temporary, workaround solution it would allow you to program the chip although rather inconveniently in two separate passes. 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.

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. You can link to a specific post using the little icon to the left of Posted: That should make it possible to use the chip without needing a Mega for the extra pins.

Next step would be my soldering. Send Bitcoin tips to: One should use the levels stated in the table and not the diagram. Fri Jul 14, 4: Thank you for your quick reply John. It does need you to erase them before programming. There’d be no need for hardware or software to support a bit address, so these options could be omitted or temporarily bypassed.


It sounds like you need to write some board test programs to measure and verify things without a 28cc512 chip in the socket. Thu Jul 13, I’d think it would be a big deal to even used a C64 or less without too much effort.

28C datasheet & applicatoin notes – Datasheet Archive

The caps and solder for them were exactly the same size. If you’re unable to make this work then it probably indicates a defective at29ca or some other underlying issue. In the last photo, i did not account for the zif socket size as i ordered the socket after i had submitted the gerbers. Sat Jul 15, 2: You might check the data sheet for this chip.

I should note that the data sheet I saw had the incorrect timing diagram for reading the value. Previous topic Next topic. It is failing because it won’t erase.

Can you post the schematic?