Changes
/* CSYNC signal */
* H06 which counts the number of CRTC characters processed during an HSYNC. H06 is incremented by the Gate Array for each CRTC character when CRTC HSYNC is active. The Gate Array activates the C-HSYNC signal when H06 reaches 2. It deactivates this signal when H06 reaches 6.
* V26 which counts the number of HSYNCs occuring during a VSYNC. V26 is incremented by the Gate Array when the CRTC signals an end of HSYNC. The Gate Array activates the C-VSYNC signal when V26 reaches 2. It deactivates this signal when V26 reaches 6.
The HSYNC signal from the CRTC is 0 when inactive and 1 when active. Same for VSYNC.
C-HSYNC and C-VSYNC are composited using the XNOR function. The resulting CSYNC signal produced by the Gate Array is 1 when inactive and 0 when active. On a CPC monitor, the CSYNC is rendered in "absolute black". It is darker than the palette colour black output by the Gate Array.
== Controlling the Gate Array ==
