Changes
Added CPCAI serial interface
#F8B0 : Vidi-CPC Video-Digitiser ? / ?
#F8B1 : Vidi-CPC Video-Digitiser ? / ?
#F8DC-#F8DD : CPCI Serial Interface write / read
#F8E0 : Z80 STI Indirect Data Register write / read
#F8E1 : Z80 STI Gen. Purpose I/O Interrupt write / read