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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!swrinde!gatech!destroyer!mudos!mudos!not-for-mail
- From: mju@mudos.ann-arbor.mi.us (Marc Unangst)
- Newsgroups: comp.dcom.modems
- Subject: Re: Upgrading a ZyXEL 1496E to an E+
- Date: 10 Jan 1993 20:32:24 -0500
- Organization: The Programmers' Pit Stop, Ann Arbor MI
- Lines: 41
- Message-ID: <1iqin8INN4k2@mudos.ann-arbor.mi.us>
- References: <93Jan08.021101.27410@acs.ucalgary.ca> <1inih0INNqsh@mudos.ann-arbor.mi.us> <mckeeveb.726656955@sfu.ca>
- NNTP-Posting-Host: mudos.ann-arbor.mi.us
-
- In article <mckeeveb.726656955@sfu.ca> mckeeveb@monashee.sfu.ca (Gumby - The unknown user) writes:
- >Um, hate to interrupt.. but the innards of the new E's and E+'s are identical.
- >Some of the older ones may actually have slower processors, but the only other
- >separating factor we can find is that E+'s always have the 1992 DSP RAM board
- >where E's *MAY* have the older/smaller 1990 model.
-
- Then I stand corrected. I'm now sorry that I didn't get a chance to
- take a look at the E+ we had in a week ago; we'll probably never sell
- one (too much extra cost for too little extra features), and it would
- have been nice to compare them.
-
- For reference: I have a ZyXEL U-1496E, s/n S2B0230110, mainboard s/n
- 2A00227492. The mainboard appears to be rev. B1. The piggyback DSP
- RAM board is the 1992 model, rev. 1. There is a jumper wire soldered
- between the far two pins on jumper J3, and no jumper wire on J4.
-
- Now, are you telling me that simply by putting in a new DSP RAM board,
- changing that jumper wire, and loading E+ EPROMs, I could have an E+?
- If this is true, then the upgrade would definitely be worthwhile. If,
- on the other hand, we're still talking about replacing the 68000 with
- a faster model or other complex modifications, I'll stand by my
- position that an E->E+ upgrade is not practical.
-
- >On all the units made after the E+ was released, there is a jumper on the
- >main board to select processor speed. There really is no difference.
-
- I'm assuming that this is the soldered jumper under the DSP RAM board
- and behind the DTR LED, not some other jumper that's using a jumper
- block.
-
- Interestingly enough, there are also a few empty solder pads to the
- left of the 68000 chip. There are two marked JP2, two marked C97, two
- marked L3, and a 14-pin DIP marked U41. To the right of the 68000
- there is another empty capacitor, C87. Does anyone know if these
- board positions are used in the E+?
-
- --
- Marc Unangst, N8VRH | "Of course, in order to understand this you
- mju@mudos.ann-arbor.mi.us | have to remember that the nucleus of the atom
- | is squishy."
- | -W. Scheider, from a Physics lecture
-