vgetty and ZyXEL 1496? [EPROM upgrade]

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Hi,

On Tue, Jun 08, 1999 at 06:35:55PM +0200, Wolfram Gloger wrote:
> > Try ftp.europe.zyxel.com, directory /public/u-series/1496/firmware/6.20.
> 
> I took out the EPROMs from 4 U1496EGs and 1 U1496EG+ (ripping of all
> the labels) and burnt the 6.20/6.20+ images found at this ftp address.
> 
> Result: All 4 U1496EGs seem to work fine with release 6.20, *but* the
> U1496EG+ seems dead -- all LEDs go off shortly after power-on.
> 
> Is it possible that I made a mistake and the EPROM _hardware_ in the
> Plus models is different (of course I know that the software has to be
> different), e.g. faster Chips than for the non-Plus model?  

Yes.  The non-plus need 120ns, the plus needs 100ns EPROMs.

> (The chips
> very probably got mixed up during burning, so the Plus model now has
> EPROMs in it that had been in a non-Plus model, but I really didn't
> think that this should cause a problem.)

It might work, but it might not - seems that in your case, the tolerances
aren't high enough, so it doesn't work.

> Sorry, this is almost off-topic for the mgetty-list but I haven't
> received a reply from ZyXel or on their mailing list.

It's almost on-topic :-)

gert

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Gert Doering - Munich, Germany                             gert@greenie.muc.de
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