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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. It is failing because it won’t erase. Sat Jul 15, 2: In other words bypassing your bit mod’s allows you to isolate certain parts of the problem — which of course is a datassheet troubleshooting technique. You can only flip bits one way by writing, datassheet the 28C parts.

The programming isn’t too complicated. I see no schematic there? Dr Jefyll, Datazheet [Bot] and 2 guests. Previous topic Next topic. Mon Dec 31, 1: It has worked before on their boards. In the last photo, i did not account for the zif socket size as i ordered the socket after i had submitted the gerbers. Thank you so much Mario.

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I use a 28C64 on my to adapter. Sat Jul 15, 6: Can fatasheet one steer me to the right direction. Next step would be my soldering.

View 28c512-513 datasheet:

You can use datadheet registers for the address lines and a universal shift register for the data lines. In any case, if I understand right you are using an arduino. Thu Jul 13, I’d think it would be a big deal to even used a C64 or less without too much effort.

Sat Jul 15, 1: Dwight I’ve message rpress about the reading issue. Thank you for your quick reply John. The caps and solder for them were exactly the same size. Fri Jul 14, 4: But the regular dip socket will be fine for me as i have a ic puller.

28C Datasheet PDF – ON Semiconductor

I have everything soldered on one board. I am using this programmer just to program the 27sf chips. Sat Jul 15, 9: 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.

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Fri Jul 14, 3: Send Bitcoin tips to: Unlike the 28C, these need 12V applied to the correct pins to program.

28C512 Datasheet PDF

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. Select a forum Do you know of a project that has already accomplished this feat? These chips were really intended to be programmed in place. Thu May 04, 9: As long as the Vpp is right, it should work. You might check the data sheet for this chip.