8-bit 80C51 CISC MCU, 33MHz, 40-Pin PDIP, ROMLess
8-bit 80C51 MCU, 33MHz, 4KB EPROM, 5V, 32 I/O, PDIP
8-bit 80C51 CISC MCU, 4KB EPROM, 33MHz, 40-Pin PDIP