20 PIECES PAL16R8B-2CN  MMI
 20 PIN DIP 
PROGRAMMABLE ARRAY LOGIC 
NOS 1 TUBE
https://www.datasheetarchive.com/pdf/download.php?id=6b0f7025d0c56989d43ff51ab19fbf135e05ee&type=M&term=PAL16R8B2CN