name:         HT6P20B
function:     2**24 OTP Encoder
package:      DIP/NSOP8,8
manufacturer: Holtek

     +--()--+
  D0 | 1   8| NC
  D1 | 2   7| VDD
 VSS | 3   6| DOUT
OSC2 | 4   5| OSC1
     +------+


This pinout came from the Chipdir:
http://www.chipdir.org/