INT 16 - K3PLUS v6.00+ (API v2.0+) - COPY INTO EXTENDED BUFFER
AX = AF25h
BX = 4B33h ('K3')
CX = number of keystrokes to copy
ES:SI -> buffer containing keystrokes
Return: CF clear if successful
CF set on error (i.e. buffer full)
CX = number of keystrokes NOT transferred
ES:SI -> first keystroke not transferred
Note: this function replaces the identical function AH=25h"K3"
SeeAlso: AH=25h"K3",AX=AF20h,AX=AF4Dh,AX=AF50h,INT 2F/AX=D44Fh/BX=0001h