Xref: utzoo comp.sys.amiga.tech:4120 sci.electronics:5522
Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!intvax!bryan
From: bryan@intvax.UUCP (Jon R Bryan)
Newsgroups: comp.sys.amiga.tech,sci.electronics
Subject: Re: RS488 differential drivers
Summary: I think you mean RS-485
Message-ID: <842@intvax.UUCP>
Date: 13 Mar 89 15:52:41 GMT
References: <7514@killer.Dallas.TX.US>
Organization: Sandia National Labs, Org. 1411, Albq, NM
Lines: 24

In article <7514@killer.Dallas.TX.US>, elg@killer.Dallas.TX.US (Eric Green) writes:
> I'm doing sort of a simple cheap little network for connecting a
> couple of Amigae together ...
>       I recall RS488 from somewhere, and looking in a Motorola data
> book indeed find some RS488 driver chips. ...
> --
> |    // Eric Lee Green              P.O. Box 92191, Lafayette, LA 70509     |
> |   //  ..!{ames,decwrl,mit-eddie,osu-cis}!killer!elg     (318)989-9849     |
> | \X/   

I believe you are referring to RS-485, not 488.  IEEE-488 is an 8-bit
parallel standard.  That's probably what you're remembering.  Lots of
people make drivers for RS-485 (and RS-422, which you should probably
also look into).  Call your local Texas Instruments distributor and see
if you can get a copy of "Linear and Interface Circuits Applications
Volume 2: Line Circuits, Display Drivers."  There's a section in there
on RS-422/485 which describes the circuitry.  Protocols are another
story.  I don't have that book.  You might also want TI's "Interface
Circuits Data Book," which includes a _wide_ selection of differential
line drivers and receivers.  If all you want to do is connect your Amiga
with an AT at the other end of the building then just about any
differential driver will do the job.  For that matter, if it's only 100
feet a single-ended driver will probably work fine.  Ground the shield
on the cable at only one end.