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(PDF) 28C512 Datasheet download

As long as the Vpp is right, it should work. Gonna solder 2 more boards, one with hot air soldering and one with my reflow oven.

Sat Jul 15, 6: You can only flip bits one way by writing, unlike the 28C parts. HTH — good luck!

Unlike the 28C, these need 12V applied to the correct pins to program. Schematic is on page 8 and fourth post down. No need to make a special programmer. Here are some pictures in the mean time: The programming isn’t too complicated. Fri Jul 14, I have dstasheet soldered on one board.

Mon Dec 31, 1: I should note that the data sheet I saw had the incorrect timing diagram for reading the value. Just wanted to say thanks to rpress and marc to helping with the schematic on this programmer.

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When you verify, does it show you the value read? 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. Someone recently tried hooking up a static RAM chip to an Arduino with some shift registers.

Sat Jul 15, 1: Fri Jul 14, 4: I’ve made some boards based on the optimized version that rpress did. It’s best if you do attach images, but if they are big, better not to inline them.

As datashete temporary, workaround solution it would allow you to program the chip although rather inconveniently in two separate passes. Fri Jul 14, 3: Thu May 04, 9: Then datashset remaining sixteen address inputs would come from the programmer.

View 28c512-513 datasheet:

I’ve double tripled check my traces and everything goes where it should. It might not have a proper connection. Dataeheet sounds like you need to write some board test programs to measure and verify things without a flash chip in the socket.

I use a 28C64 on my to adapter. These chips were really intended to be programmed in place. Datxsheet seem to find many posts about Ic2 eeproms and SPI eeproms, but not parallel eeproms.


I don’t want to reinvent the wheel for something that I’m sure has been done before. You can link to a specific post using the little icon to the left of Posted: Select a forum Thu Jul 13, It is failing because it won’t erase. You can use shift registers for the address lines and a universal shift register for the data lines. However, after doing several searches, including reading several posts about interfacing with eproms, I have yet to find a solution.

28C 28C parallel eeproms

Sat Jul 15, 2: Dwight I’ve message rpress about the reading issue. I’d think it would be a big deal to even used a C64 or less without too much effort. It has worked before on their boards. Download the data sheet to see how to address, read, and write to the chip.

I think the jest of my post was lost.