Changes
CRTC
,/* CUDISP (Cursor Display) */
CRTC pins RA3, RA4, MA10, MA11 are not connected on CPC.
== CUDISP (Cursor Displayaka CURSOR) ==
CUDISP (Cursor Display) signal defines the hardware cursor.
CRTC pin CUDISP is not connected to the Gate Array, so it has no effect on a barebone CPC or Plus machine.