INT 16 O - K3 v1.5x, K3PLUS v5.xx - COPY INTO EXTENDED BUFFER                   
	AH = 25h
	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 was normally unsupported under K3PLUS v6.00-v6.22 and
	  is no longer supported by v6.30+; use AX=AF25h instead
SeeAlso: AH=05h,AH=20h"K3",AX=AF25h,INT 2F/AX=D44Fh/BX=0001h