Apple II Computer Info
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### FILE : video.rgb
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### Created : Sunday, January 14, 1996 Modified: Sunday, January 14, 1996
### File Type: "TEXT" File Creator: "LMAN"
### File Size: 5302 bytes 5 KB
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Newsgroups: comp.sys.apple2
Path: news.uiowa.edu!uunet!comp.vuw.ac.nz!actrix.gen.nz!dempson
Subject: Re: Need info on monitor
Organization: Actrix Information Exchange
Date: Thu, 30 Mar 1995 13:52:23 GMT
100000@owens>
X-Nntp-Posting-Host: atlantis.actrix.gen.nz
Lines: 101
In article <Pine.SUN.3.91.950329093407.29258A-100000@owens>,
>
> There used to be a RGB converter for the IIc, but I have not
> seen one for years. It is not a simple matter of finding the right cable.
> I was not aware that the IIc or the Laser 128 puts out a RGB signal.
I don't know about the Laser. The IIc doesn't have built-in RGB
output. Its video port provides several low-level timing signals
which allow RGB data to be decoded from the composite video signal
(which is also provided on the port), but this requires external
hardware.
The "standard" IIc RGB adaptor (assuming there was one) would probably
have produced digital RGB output, the same as the Apple III and the
Apple IIe memory expansion cards with RGB output. With a digital RGB
monitor, standard digital logic levels (TTL) indicate whether a colour
(or colour weighting) is present or absent. One wire is required for
each bit of each primary colour.
The IIgs, on the other hand, produces an analog RGB signal - a voltage
on the Red, Green and Blue outputs represents the intensity of each
primary colour. Any number of shades of each colour can be supported,
by providing a finer resolution digital to analog converter within the
computer. The IIgs has 4-bit D-to-A for each primary colour. High-end
video cards on the Mac and PC (SVGA) use 8-bit D-to-A for each primary
colour.
Digital RGB monitors cannot be used with an Analog RGB signal (unless
comparators are used to generate a digital signal from the analog one).
Analog RGB monitors cannot normally be used with a Digital RGB signal,
but generating an analog signal is possible with a resistor network
(an example of this is given in the Apple III Owner's Guide). In some
cases, it may be possible to plug an Analog RGB monitor into a Digital
RGB output, but it won't produce the correct colours (when compared
Apple II Computer Technical Information : Apple II Family Hardware Info
ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 551 of 572
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