TD87C52-1 CHMOS single-chip 8-bit microcontroller. 3.5 MHz to 16 MHz, 5 V, EPROM 8 Kbytes, RAM 256 bytes
TD87C52-2 CHMOS single-chip 8-bit microcontroller. 0.5 MHz to 12 MHz, 5 V, EPROM 8 Kbytes, RAM 256 bytes
TD87C52-24 CHMOS single-chip 8-bit microcontroller. 3.5 MHz to 24 MHz, 5 V, EPROM 8 Kbytes, RAM 256 bytes