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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’d think it would be a big deal to even used a C64 or less without too much effort.

Sat Jul 15, Download the data sheet to see how to address, read, and write to the chip. It has worked before on their boards.

(PDF) 28C512 Datasheet download

Unlike the 28C, these need 12V applied to the correct pins to program. You might check the data sheet for this chip.

Sat Jul 15, 1: Ok, I will keep that in mind when I post up the boards after soldering the components. Here are some pictures in the mean time: Thank you so much Mario. Haven’t soldered anything yet but will this weekend. I see no schematic there? Mon Dec 31, 1: Polarity on the capacitors are correct. Everything goes smoothly had a finicky USB wire connecting to my Leonardo and uno but i am getting a failure for the verifying part. It is failing because it won’t erase.

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The programming isn’t too complicated. Send Bitcoin tips to: Then the remaining sixteen address inputs would come from the programmer. 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. Will report back when soldered and tested.

Thu May 04, 6: I am using this programmer just to program the 27sf chips. The caps and solder for them were exactly the same size.


I have everything soldered on one board. In the last photo, i did not account for the zif socket size as i ordered the socket after i had submitted the gerbers. 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. Can you post the schematic? Dr Jefyll, Google [Bot] and 2 guests.


You can link to a specific post using the little icon to the left of Posted: It sounds like you need to write some board test programs to measure and verify things without a flash chip in the socket. I also got it looking close to what unaclocker had. As long as the Vpp is right, it should work. When you verify, does it show you the value read? You can adtasheet shift registers for the address lines and a universal shift register for the data lines.

Fri Jul 14, Fri Jul 14, 4: