Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!att!cbnewsh!rkl
From: rkl@cbnewsh.ATT.COM (kevin.laux)
Newsgroups: comp.sys.ibm.pc
Subject: Re: TTL Mono Monitor and Composite Mono Monitors
Message-ID: <7601@cbnewsh.ATT.COM>
Date: 23 Jan 90 19:16:19 GMT
References: <13120.25bb055b@max.u.washington.edu>
Organization: AT&T Bell Laboratories
Lines: 23

In article <13120.25bb055b@max.u.washington.edu>, scott@max.u.washington.edu writes:
| Could any who is knowlegable about monitors tell me what is the
| difference between a TTL monochrome monitor and a Composite
| monochrome monitor? Is it merely a different in the connector type.
| It seems that TTL monitors have DB9 type connectors and a Composite
| monitors have RCA phone plugs.

	Simply put, the TTL monitors have the components of the video signal
such as horizontal and vertical sync on the individual pins of the DB9
connector.  The Composite (Sync) monitors have a single pin that carries
all the components of the video in a single signal.  The monitors have
different circuitry inside to handle the two types of input and one cannot
handle the other type.  (There *are* monitors that have multiple sets of
input connectors and a switch to set where/what the input is.)

| If the difference goes beyond difference in connector-type, how
| difficult is it to adopt a TTL monochrome monitor so that it will  
| accept the signals that a Composite monochrome monitor would accept.

	You would need to get a converter that accepts Composite Sync and
outputs it as TTL.

|-rkl