David, This might seem stupid, but I recently had peculiar results with a usb-powered programmer failing on certain ranges of addresses on certain chips, that turned out to be inadequate current available on my USB port. For me, a high-current powered USB hub solved it. I programmed a huge number of chips successfully before I ran into this problem with a particular batch of chips.
Mark Mark G Thomas > On Feb 4, 2018, at 9:40 AM, David Griffith via cctalk <[email protected]> > wrote: > > > I have a few tubes of ST-branded M27C256B UV-erasable EPROM chips. All of > these fail to program starting at 0x200 until 0x27F. At 0x200, 0x00 is > written, then until 0x27F, the bytes are 0xFF. What would cause this? Can it > be fixed by an extra-long time in the eraser? Should I just break out the > hammer? > > At least I know the programmer is capable of programming a TI-branded 27c256 > and 29c256 flash chips. Might there be a bug in the programming software? > > FWIW, I'm using a Minipro TL855. Linux software is available at Github: > https://github.com/vdudouyt/minipro > > -- > David Griffith > [email protected] > > A: Because it fouls the order in which people normally read text. > Q: Why is top-posting such a bad thing? > A: Top-posting. > Q: What is the most annoying thing in e-mail?
