National Semiconductor ( MCU )

NS87P50D-6
 
6 MHz
40 pin CERDIP
Purple/Gold top/Gold pins
NS87P50D-11
 
11 MHz
40 pin CERDIP
Purple/Gold top/Gold pins
NS87P50UD-11
 
11 MHz
40 pin CERDIP
Purple/Gold top/Gold pins
NS87P50R-6  sold
 
11 MHz
40 pin PDIP