E2E1022-27-Y4 ¡ Semiconductor MSM80C48/49/50 MSM.
OKI electronic componets
MSM80C50 - CMOS 8-Bit Microcontroller
E2E1022-27-Y4 ¡ Semiconductor MSM80C48/49/50 MSM80C35/39/40 ¡ Semiconductor CMOS 8-Bit Microcontroller This version: Jan. 1998 MSM80C48/49/50, MSM80.