Date   : Thu, 08 Jan 2015 09:14:44 +0000
From   : chris@... (Chris Johns)
Subject: Compromises

On 08/01/2015 00:20, Daniel Beardsmore wrote:
> But is wasn't a choice of colours. It was digital RGB. That specifies 
> a set of colours, there is no choice.
> Why was digital RGB a requirement?

I guess because 'most' monitors of the time were digital RGB. In it's 
simplest form, that meant each gun could be either 'on' or 'off', giving 
the eight colours the BBC uses.

CGA was digital RGB, plus one 'intensity' signal, so you got 'bright' 
and 'dim' versions of each colour.

EGA (which according to wiki wasn't around until 84) had an intensity 
signals for each colour, giving two bits per colour.

I don't think analogue RGB monitors, such as the classic CM8833 were 
common until the Amiga days.

That said, even CGA's RGB+I would've been better than the rather 
pointless flashing "colours".

Cheers

Chris