Question about ZyXEL U-1496B

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hi,

Wes Brown wrote:
> Well, after problems with getting my Prometheus ProModem to do what I
> wanted, I found a ZyXEL U-1496B for almost nothing. I have plugged the
> card in but it seems to die after talking breefly to it.

Uh. No good.

> I am thinking of upgrading the ROMs in it, but I was concerned by the
> stacked sockets in U24 and U25. The original screen seems to have been
> designed for 28 pin EPROMs. However, a modification has been made such
> that 32 pin sockets and 27C010-150DC EPROMS are in those sockets.

Yes, that's fairly common.

> My question for any person on this list is two fold. Is this modification
> the way ZyXEL intended things? 

The first 1496's shipped could only use 512kbit Eproms. Later software
versions were larger than that, and thus larger modems were made with
1Mbit sockets (32pin). Older modems DO have enough address lines and
everything to accomondate 1Mbit Eproms, so these intermediate sockets were
built (Marc also has a 1496B that is modified that way).

< Secondly, should I use 27C010-150s for the
> upgrade or should they be faster?

I think you have to use -120s for the non-plus models, and -100s for the
E+/B+

gert

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