Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!usc!orion.oac.uci.edu!mrichey
From: mrichey@orion.oac.uci.edu (Mike Richey)
Newsgroups: comp.sys.ibm.pc
Subject: Re: extension cable for EGA/VGA monitor
Keywords: extension monitor/keyboard cable
Message-ID: <3520@orion.cf.uci.edu>
Date: 19 Oct 89 23:21:43 GMT
References: <[253d2160:289]comp.sys.ibm.pc@nstar.UUCP> <4241@ncsuvx.ncsu.edu>
Reply-To: mrichey@orion.oac.uci.edu (Mike Richey)
Organization: University of California, Irvine
Lines: 21

In article <4241@ncsuvx.ncsu.edu> unkydave@shumv1.ncsu.edu (David Bank) writes:
>In article <[253d2160:289]comp.sys.ibm.pc@nstar.UUCP> akcs.larry@nstar.UUCP (Larry Snyder) writes:
>>What is the longest one could build a keyboard/monitor
>>extension cable for a VGA or EGA monitor and have it work
>>without damaging any of the equipment?  
>> 
>>Could it be 40 feet long?  50 feet?

>    Well, the keyboard is essentially a serial device. A "typical"
>serial port (let me know when you find one) can drive about 100
>feet without any noticeable loss of signal. 

However, the logic operates at 5volts only. It's TTL. 5Volts is
supplied directly to the keyboard through the DIN connector, from the
system board. IMHO, 30 feet would be pushing it. The Clock and keyboard 
data operate with standard TTL levels.

Michael S. Richey    Internet: mrichey@orion.oac.uci.edu
Bitnet: MRichey@UCI  CompuServe: 71650,3132    Voice: (714) 856-8374
University of California, Irvine    Network and Telecommunications Services
342 Computer Science      Irvine,   CA  92717