Changes
We didn't revert this when I got it wrong before :P
== Video ==
* The [[CRTC]] should be more or less same as those used in CPCs. The handbook and schematic say the CRTC is a CM 607, but the CRTC in CPCLERmine [=Kevin's ] is an HD6845P.
* The clocks for each mode (0,1 and 2) are derived from the main 16Mhz clock, these then drive the shift registers to output pixels to the display.
* Mode 3 is hardwired to 5V, so it doesn't have a clock. The shift registers are stopped and output the last colour they clocked in. Even if this mode was activated in way of connecting up the clock for Mode 0 it is not decoded the same as on the CPC: 8 colours are chosen from the 16 colour palette, instead of 4.
