INT 10 - EGA Register Interface Library - WRITE ONE REGISTER AH = F1h DX = group index (see #00223) if single register: BL = value to write otherwise BL = register number BH = value to write Return: BL = data Note: the RIL is provided by EGA.SYS, the Microsoft Mouse driver, the OS/2 compatibility box, and others SeeAlso: AX=7F05h,AH=F0h"EGA",AH=F3h"EGA",AH=FAh"EGA"