NEC IC - D8251AFC, DIP-28, Communications Interface RH.

M82C51A OKI CMOS Programmable USART UART Sync/Async Serial Interface TTL DIP-28

AMD P8251A USART 28-pin Synchronous Asynchronous Receiver IC Chip @CPUAA

D8251C NEC ,IC,COMMUNICATIONS INTERFACE,MOS,DIP,28PIN,PLASTIC

2x - Intel P8251A Programmable Communication Interface

27C512-12 Microchip EPROM, 64KX8, 125ns, CMOS, CDIP28 IC

ONE Signetics 2651I , Programmable Communication controller, Ceramic CDIP28

(1 PC) WS27C256L-12T WSI UVPROM, 32KX8, 120ns, CMOS, CDIP28