home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!usc!sol.ctr.columbia.edu!ira.uka.de!smurf.sub.org!nadia!amylnd!laosinh!gerrit
- From: gerrit@laosinh.stgt.sub.org (Gerrit Heitsch)
- Newsgroups: comp.dcom.modems
- Subject: Re: ROM size of Supra v32bis
- Message-ID: <B4hyr*po1@laosinh.stgt.sub.org>
- Date: Fri, 21 Aug 1992 20:20:53 MET
- References: <1992Aug7.041520.7580@ccsun7.csie.nctu.edu.tw> <H.5oAb9sFifao@mips.ruessel.sub.org>
- <0-PCNews-124beta@rshark.mixcom.com>
- Distribution: world
- Organization: Lao-Sinh project (private UUCP site)
- Lines: 25
-
- In article <0-PCNews-124beta@rshark.mixcom.com>, Brian Kapitan writes:
-
- > Sure there are. AMD (among others) makes EPROMS faster than 55ns. Other
- > choices would be Cypress, Idt.
- I use an AM27H256-55 for my selfmade update from 1.000E to 1.200C.
- Works fine.
-
- > Plus, i'd love to see the Rockwell data sheet, since my modem's got a pair
- > of -12's. and the old roms had a fast (70ns) and a slow (>100ns)...
- Are you sure, that your EPROMs are -12 and your CPU is a C1999-16?
- I have a sample circuit diagram from Rockwell for the RC144DP and the
- parts list clearly states that you have to use a 55ns EPROM!
- The original EPROMs were one 27HC256-55 from CSI and one 27C256-12 from
- Taiwan microchip.
-
- Take a closer look at your EPROMs, maybe there is an additional
- marking on them.
-
- Gerrit
-
- --
- Gerrit Heitsch Moenchweg 16 7038 Holzgerlingen Germany
- Logical adresses: UUCP: gerrit@laosinh.stgt.sub.org FIDO: (2:247/706.9)
- If you are from outer space, please use:
- universe!local-cluster!milkyway!solarsystem!terra!europe!laosinh!gerrit
-