Date   : Fri, 21 Apr 2006 04:58:57 +0100
From   : Mike Tomlinson <mike@...>
Subject: Re: Using an AKF30 with a Beeb

In article <7.0.1.0.2.20060419163713.034d4140@...>, Joel Rowbottom
<joel@...> writes

>Just returning back to this, I finally got round to hauling my own 
>AKF30 out of the loft and wired up an experimental cable. I don't 
>think it's CGA, it's another "standard" I'd not heard of called PGA.

I doubt it.  PGA was an IBM invention which never took off to become a
standard, unlike CGA, EGA and VGA.  PGA card output differed from CGA
and EGA in that it was analogue (CGA and EGA were digital.)

PGA cards were huge and horrendously expensive.  The system was intended
for high-resolution applications like CAD.  Although calling 640x480
"high resolution" nowadays seems like a bad joke. :-)

http://incolor.inebraska.com/bill_r/ibm_pga_graphics_adapter.htm
http://en.wikipedia.org/wiki/Professional_Graphics_Controller

To clear up an earlier sub-thread: the term "CGA" has become mis-used to
refer to basic monitors which will sync down to 15 KHz (TV-type)
frequencies.  CGA actually refers to the IBM CGA (Colour Graphics
Adapter), which was a 3-bit (RGB) digital out put with an additional
Intensity pin, which gave 16 colours (8 base colours plus a "bright"
version of each, so "bright black" = grey, "bright red" = pink, etc.)

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