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The first bad byte written is 0x Subsequent bad bytes are 0xFF. Then from 0x on, the chip contains the expected data. Would this be caused by a failure in the chips or might there be something wrong with the controlling program? I don't have any other means of programming chips. Does anyone here have a working programmer from the s or s and a UV eraser?

I'd like to provide you with one or two of these chips so we can determine what the problem is. It could be trouble in this software, trouble in the tl's firmware, or simply a bad batch of chips.

This chip is still popular enough that I feel it's important to get to the bottom of the problem. I don't have an eraser, but if you could send one device of your batch to Germany, I could try to program using a Willem or TaskIt. For the sake of advance in this issue ;. Really wonder why this exact device is causing trouble. But just a guess …. For example, I could check for correct programming voltage more easily if I knew how it is defined.

Please hold on buying that eraser for a bit. I have a couple more tests I'd like to run involving the official software and different firmware versions. I just checked programming some M27CB chips with our minipro program and the official program. I tried with firmware versions 3. Each time with our minipro, the programming failed exactly as I described above.

Each time with the official program versions 5. So, I'm positive now that the problem is with our implementation. Word of warning At least for me, Virtualbox will automatically latch onto the tl When the connect and disconnect happens with the firmware updater, Virtualbox will grab the tl and cause a failed erase or write.

Fortunately this is easily recovered from by just trying again, or shutting off Virtualbox. Thanks for the hint, be careful! So I will get an UV eraser. Is it usable? I have no experience with those Chinese erasers. I forgot to mention that I used radiomanV 's firmware updater compiled for Linux, not the Windows version.

DavidGriffith I have not received an IC from you, did you send it or not? Just asking to be sure ;. Is the physical address you sent me earlier still valid? Shall I send you a chip now? DavidGriffith , I was just wondering if it has been lost. As your questions have been answered, I don't know if I can find out anything new to help fix the issue.

But if you want to give it a try and have too many chips, the address is still valid. Seems like all these chips want Skip to content. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Labels bug question. Milestone 1. Copy link Quote reply. Collaborator Author. That exact brand and part number? Last proper release 0. Could you email me with your physical address?

DavidGriffith added this to the 1. DavidGriffith added the question label Mar 12, DavidGriffith added the bug label Mar 21, Thank you, David. But just a guess … could be helpful in this issue. Yeah, that sounds familiar. Maybe a relabel …. DavidGriffith closed this Feb 27, Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment. Linked pull requests. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.



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ST 27c256b-70c6 EPROM 256k 32kx8 70ns 27c256b m27c256 5v plcc-32 OTP



M27C256B EPROM. Datasheet pdf. Equivalent




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