Xref: utzoo comp.sys.amiga.tech:4109 sci.electronics:5516
Path: utzoo!attcan!uunet!husc6!cmcl2!rutgers!bellcore!texbell!killer!elg
From: elg@killer.Dallas.TX.US (Eric Green)
Newsgroups: comp.sys.amiga.tech,sci.electronics
Subject: RS488 differential drivers
Message-ID: <7514@killer.Dallas.TX.US>
Date: 12 Mar 89 06:31:38 GMT
Reply-To: elg@killer.DALLAS.TX.US (Eric Green)
Organization: The Unix(R) Connection BBS, Dallas, Tx
Lines: 24

I'm doing sort of a simple cheap little network for connecting a
couple of Amigae together (using Matt's D-NET hacked with Justin
McCormick's EMIT code), and have a slight problem: I don't think
that RS232 voltage levels will do too well for 128kbaud at long
distances. Since I want to move an Amiga into my bedroom, 100 feet
away from the computer room, due to a slight space crunch (brother
bringing home one of the biggest damned AT clones I've ever seen,
takes up half the room ;-), this is a serious problem indeed.
      I recall RS488 from somewhere, and looking in a Motorola data
book indeed find some RS488 driver chips. BUT: How far will these work
at the baud rates above? What kind of cable is necessary? (shielded
multiple twisted pair, I suppose). What are the preferred RS488
driver/reciever chips (analgous to the 1488/1489 pair in RS232 land)?
Since I'm a programmer type, RF considerations are quite foreign to me
(who was it who said "beware of programmers with screwdrivers"? I've
been doing altogether too much wire-wrapping and soldering lately!)...
so I'd appreciate any help (& handholding ;-) that I get.

   Eric

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