Int 16 Fn 25  O - K3 V1.5x, K3plus V5.xx - Copy Into Extended Buffer       [K]

   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

See Also: AH=05h,AH=20h"K3",AX=AF25h,INT 2F/AX=D44Fh/BX=0001h