vgetty and ZyXEL 1496? [EPROM upgrade]

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This mistery (why my 1496EG+ couldn't be EPROM-upgraded) is finally
solved !

Summary: _don't_ use floppies, or only use them with checksums.

schaefer@alphanet.ch (Marc SCHAEFER) writes:

> It's possible, since I was thinking the processor was clocked higher
> in the PLUS model. What is the speed on the EPROM you have (read
> what's on them, after the dash).

All the EPROMs I burnt actually had `-10', 100nsec speed which should
be easily sufficient for both the non-Plus and the Plus model.  So the
mixing of EPROM chips which I had done was actually OK...

It took a while before I checked the 3.5" floppy containing the ROM
images that had been burnt, and guess what, the second image for the
Plus model was actually quite different from the original.  I am
completely sure that I got no I/O error when writing the floppy, and
it could be read without retries or any problems several times on
several drives.  Nevertheless, the file on the floppy and on my disk
were consistently different.

Actually, I was lucky, because if the non-Plus images had been
affected, I would have had to re-program 10 EPROMs.  So I only had to
re-burn one chip and my 1496EG+ is now running fine with ROM release
6.20 as well.

That will teach me a lesson to always unpack checksummed archives
(tar, gzip or even zip) from floppies for important files...

Regards,
Wolfram.