Xref: utzoo comp.sys.ibm.pc:12820 comp.sys.atari.st:8042
Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!mailrus!tut.cis.ohio-state.edu!ut-sally!utah-cs!utah-gr!uplherc!sp7040!obie!wes
From: wes@obie.UUCP (Barnacle Wes)
Newsgroups: comp.sys.ibm.pc,comp.sys.atari.st
Subject: Re: IBM PC -> Atari ST
Message-ID: <81@obie.UUCP>
Date: 3 Mar 88 03:24:09 GMT
References: <919@xn.LL.MIT.EDU>
Organization: UinTech, Layton, UT
Lines: 25
Keywords: ST monitor on EGA/CGA?
Summary: ST color monitor -> PC CGA/EGA?  Nope.

In article <919@xn.LL.MIT.EDU>, singer@XN.LL.MIT.EDU (Matthew R. Singer) writes:
> Has anyone attempted to use the Atari ST color monitor on a PC
> using either a CGA or EGA card?  Was it successful? Can it be done?
> If so, where can I get the cables?

Nope, can't be done, at least not without some thrashing about with
the hardware.  The ST uses an Analog RGB interface, this means the
computer tells the monitor how much of each color to use by putting
out different voltages on each of the three color lines.

The PC CGA adapter uses an RGBI interface; the I stands for intensity
(I think).  The RGB values are always the same, the I dictates one of
two intensities or color sets.

The EGA adapter uses RGBII.  As you can guess, this is similar to RGBI
but carries 4 bits of Intensity data by using two lines.

The big thing about "multi-sync" monitors is that they can be driven
from Analog RGB, RGBI, or RGBII type interfaces, and at varying
vertical sync rates.

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