INTERNAL DISK ...34 PIN RIBBON  (J10)
-------------------------------------

   1   GND            18   DIRB
   2   CHNG*          19   GND
   3   GND            20   STEPB*
   4   MTR0D*(led)    21   GND
   5   GND            22   DKWDB*
   6   N.C.           23   GND
   7   GND            24   DKWEB*
   8   INDEX*         25   GND
   9   GND            26   TK0*
   10  SEL0B*         27   GND
   11  GND            28   WPRO*
   12  N.C.           29   GND
   13  GND            30   DKRD*
   14  N.C.           31   GND
   15  GND            32   SIDEB*
   16  MTR0D*         33   GND
   17  GND            34   RDY*