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Rpress has created the circuit to program the 27xXxX chips. You can only flip bits one way by writing, unlike the 28C parts. Next step would be my soldering. Welcome, Universal One thing you could do is treat the at29ca k chip as a 64 k chip by tying address input Satasheet high or low.
Schematic is on page 8 and fourth post down. Do you know of a project that has already accomplished this feat?
I see no schematic there? I don’t use a programmer, I just use the on my KIM-1 and program it in place. As a temporary, workaround solution it would allow you to program the chip although rather inconveniently in two separate passes.
I seem to find many posts about Ic2 eeproms and SPI eeproms, but not parallel eeproms. Download the data sheet to see how to address, read, and write to the chip. Sat Jul 15, 1: 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.
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Polarity on the capacitors are correct. Dr Jefyll, Google [Bot] and 2 guests. So even though it says it wrote the data, it shows as nothing has changed.
Select a forum Fri Jul 14, You can use shift registers for the address lines and datashedt universal shift register for the data lines. Thu May 04, datxsheet Thu May 04, 6: I also got it looking close to what unaclocker had. It sounds like you need to write some board test programs to measure and verify things without a flash chip in the socket.
HTH — good luck! I’ve made some boards based on the optimized version that rpress did. In any case, if I understand right you are using an arduino.
View 28c512-513 datasheet:
Ok, I will keep that in mind when I post up the boards after soldering the components. You might check the data sheet for this chip. It has worked before on their boards.
The caps and solder for them were exactly the same size.
Dataaheet 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. Thu Jul 13, I am using this programmer just to program the 27sf chips.
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