Date   : Thu, 29 Sep 1994 16:07:08 +0100 (BST)
From   : John Sullivan <js10039@...>
Subject: Re: CRTC and ULA emulation

On Thu, 29 Sep 1994, lamcw wrote:
> Revs is sneaky. heres how the screen looks like:-
> 
> 3 lines MODE 4 - for time and best time
> 
> 7 lines of apparent garbage
> 
> about 18 lines of MODE 5 for the track + car display
> 
> when i saw all that garbage, i thought it wasn't working properly. but i then
> realised that it was PROGRAM CODE!!! a video interrupt zaps all the logical
> colours to cyan so it looks blank. then another video int zaps it to the 
> colours needed for the MODE5 display. makes the Elite display look positively
> simplistic!

This is how Spy vs. Spy worked: You had two control panels on screen (one
for each player) and in between was a black section (and underneath too I
think) All colour were set to black in this section and some program code
put there 'cos the programmer ran out of real RAM while writing the game. 

John