LC66512A - EPROM-Mountable Type 4-bit Microcomputer, 12kB

Features Either 2764 or 27128 type EPROM can be mounted.
Shrink type 64-pin configuration compatible with the LC665XX series microcomputers. Note that pull-up resistors need to be xternally added.
Options provided for selecting functions.
Options allowing the user to select output signal level for ports 0, 1 and 8 at the initial reset or to specify whether the watchdog timer function is employed by setting external pin levels Instruction cycle time 0.92 to 10 microseconds.
+5V single power source.