home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!ira.uka.de!smurf.sub.org!easix!tron.gun.de!laubfrosch
- From: laubfrosch@tron.gun.de (Dieter Rosenhagen)
- Newsgroups: comp.dcom.modems
- Subject: Re:Larger EPROMs for ZyXEL 1496S (Rev. 6
- Message-ID: <1B8A267ADR@tron.gun.de>
- Organization: TRON Public Mailbox, Neurath, Germany
- Date: Sat, 22 Aug 92 16:04:00 +0200
- Lines: 72
-
- Am 17.08.92 um 11:22 schrieb g16l%alf.zfn.uni-bremen.de@USENET.ZER unter dem Betreff Larger EPROMs for ZyXEL 1496S (Rev. 6):
-
- -> From: g16l@alf.zfn.uni-bremen.de (Olav Brinkmann)
- -> Subject: Larger EPROMs for ZyXEL 1496S (Rev. 6)
- -> Message-ID: <g16l.714050390@alf.zfn.uni-bremen.de>
- -> Organization: Univ. Bremen, Informatik
- ->
- -> Hello,
- ->
- -> I'm going to put the larger EPROM sockets in my ZyXEL 1496S. The board is
- -> REV 6. Will there be any problems and do I have to consider anything
- -> special when installing the sockets?
- ->
- -> MfG Olav
- -> --
- -> [ Olav Brinkmann E-Mail : ob@hb.maus.de ]
- -> [ Uebern Berg 27 Maus-Net: Olav Brinkmann @ HB ]
- -> [ W-2875 Ganderkesee 2, Germany Voice : +49-4223-8701 ]
- -> [______________________________________ ...!uunet!unido!uniol!maushb!ob _]
- ->
- ## Ursprung : /ZyXEL-Infos
-
- U-1496 Series Modem Firmware Upgrade with 1Mbit EPROM
- -----------------------------------------------------
-
- The 1Mbit EPROM has 32pins while the 512K EPROM has only 28 pins. Among the
- four additional pins the 1M bit EPROM has, only pin 2 and pin 32 need signal
- correction, pin 1 and pin 31 have no connection inside the chip. If you put 1M
- bit EPROM chip in front of you with pin 1 on the lower left corner, the 28
- pins on the right have the same signal connection as the 512K EPROM chip.
-
- There are three cases for 1Mbit firmware upgrade:
-
- (1) There are already a pair of 32pin sockets installed on the modem main
- board.
-
- Just install the 1Mbit EPROMS in the 32-pin sockets. Note that there
- are no pin sockets for pin 1 and pin 31, no connection is needed for those
- two pins.
-
- (2) 28-pin sockets on the modem board but pin holes on the board exist for
- pin 2 and pin 32.
-
- Solder in two single-pin sockets for pin 2 and pin 32 and you can install
- the 1M bit EPROM. You need some skill to solder the single-pin socket. It
- is better to use a SIP 8-pin single-row pin socket as an alignment tool.
- Plug the single-row pin socket into the existing socket and the single-pin
- socket you want to solder and it will hold the single-pin socket in place
- while you solder.
-
- (3) 28 pin sockets on the modem board and no pin hole exists on the board for
- pin 2 and pin 32.
-
- We do NOT recommend to install 1Mbit EPROM on this case. You can do the
- following hardware modifications but it will void the warranty and it is
- difficult to remove and reprogram the EPROMS.
-
- (a) Solder a jump-wire to short pin 32 and pin 30 of the EPROM.
- (b) Install the 1Mbit EPROMS on the 28-pin sockets with the left 4pins
- outside the sockets.
- (c) Solder a wire to connect pin 2 of the EPROM to pin 45 of the MC68000
- and solder a wire to connect pin 30 and pin 32 of EPROM.
-
-
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
- Bye,
- Laubfrosch.
-
- >>>ZERBERUS-POINT FROM A.U.G.E. 4000 - LAUBFROSCH@TRON.ZER<<<
- >>> laubfrosch@tron.gun.de | Dieter Rosenhagen (2:242/21.15)
- -- THE ANSWER V2.03
-