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Users browsing this forum: Dr Jefyll, Google [Bot] and 2 guests. Mon Dec 31, 1: Thu May 04, 6: Thu May 04, 9: 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. Then the remaining sixteen address inputs would come from the programmer. Datasheett things arise from this.

As a temporary, workaround solution it would allow you to program the chip although rather inconveniently in two separate passes. There’d be no need for hardware or software to support a bit address, so these options could be omitted or temporarily bypassed.

If you’re unable to make this work then it probably indicates a defective at29ca or some other underlying issue. 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.

HTH — good luck! Thu Jul 13, Just wanted to say thanks to rpress and marc to helping with the schematic on this programmer. I’ve made some boards based on the optimized version that rpress did. I also got it looking close to what unaclocker datzsheet. Haven’t soldered anything yet 2c512 will this weekend.

Will report back when soldered and tested. Here vatasheet some pictures in the mean time: In the last photo, i did not account for the zif socket size as i ordered dagasheet socket after i had submitted the gerbers.


But the regular dip socket will be fine for me as i have a ic puller. Fri Jul 14, 3: I use a 28C64 on my to adapter. I don’t use a programmer, I just use the on my KIM-1 and program it in place. I’d think it would be a big deal to even used a C64 or less without too much effort. The programming isn’t too complicated. Fri Jul 14, 4: It’s best if you do attach images, but if they are big, better not to inline them. The forum software will automatically show a reasonably-sized preview.

Fri Jul 14, Ok, I will keep that in mind when I post up the boards after soldering the components. I think the jest of my post was lost. These chips were really intended to be programmed in place. No need to make a special programmer. Sat Jul 15, I am using this programmer just to program the 27sf chips. I have everything soldered on one board.

Everything goes smoothly had a 28c5512 USB wire connecting to my Leonardo and uno but i am getting a failure for the verifying part. Sat Jul 15, 2: You might check the data sheet for this chip. Unlike the 28C, these need 12V applied to the correct pins to program. The 28Cxx parts have a built in charge pump circuit to create their programming voltage.

Sat Jul 15, 1: I should note that the data sheet I saw had the incorrect timing diagram for reading the value. One should use the levels stated in the table and not the diagram.

Dwight, there is a charge pump circuit on the daasheet. Rpress has created the datashet to program the 27xXxX chips. It has worked before on their boards.

I’ve double tripled check my traces and everything goes where it should. Next step would be my soldering. The caps and solder for them were exactly the same size. It might not have a datsheet connection. Gonna solder 2 more boards, one with hot air soldering and one with my reflow oven. As long as the Vpp is right, it should work.


(PDF) 28C512 Datasheet download

It does need you to erase them before programming. You can only flip bits one way by writing, unlike the 28C parts. When datasheeet verify, does it show you the value read? Did you check capacitor polarity? Can you post the schematic? Sat Jul 15, 6: Schematic is on page 8 and fourth post down. Polarity on the capacitors are correct.

28C Datasheet PDF – ON Semiconductor

It is failing because it won’t erase. So even though it says it wrote the data, it shows as nothing has changed. You can link to a specific post using the little icon to the left of Posted: Sat Jul 15, 9: I see no schematic there?

In any case, if I understand right you are using an arduino. It sounds like you need to write some board test programs to measure and verify things without a flash chip in the socket. Page 15 of Previous topic Next topic. Dwight I’ve message rpress about the reading issue. 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.

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