Thanks, Glen, Anyone know of a cheap gizmo that will program the Motorola MCM68766? My programmer does not support it. -----Original Message----- From: Glen Slick [glen.slick at gmail.com] Received: Saturday, 23 Jun 2012, 8:46pm To: General Discussion: On-Topic and Off-Topic Posts [cctalk at classiccmp.org] Subject: Re: Tektronix 4052 Firmware Is the MCM68766 a compatible replacement EPROM? Those are available for $8 each at www.unicornelectronics.com