compatible with the Zilog Z80. The μPD780C corresponds to the original Z80 (max. 2.5 MHz clock), while the μPD780C-1 corresponds to the Z80A (max. 4 MHz clock) and the μPD780C-2 to the Z80B (max. 6 MHz clock). The µPD780C-1 was used in Sinclair's ZX80, ZX81 and early versions of the ZX Spectrum, in several MSX and NEC (PC-6000, PC-8000, PC-8800) computers, in musical synthesizers such as Oberheim OB-8, and in Sega's SG-1000 game console. A CMOS version (μPD70008) followed later. μCOM-84 The µCOM-84 (µPD8048 etc.) is compatible with Intel's 8-bit microcontroller 8048. CMOS microcontrollers up to μPD80C50 followed, but an Intel 8051 compatible product, which is the 8-bit industry standard, was never offered. μCOM-85 The µCOM-85 (µPD8085) is an Intel 8085 compatible 8-bit microprocessor. μCOM-86, μCOM-88 The µCOM-86 (µPD8086) and µCOM-88 (µPD8088) are Intel 8086 and Intel 8088 compatible 16-bit microprocessors. They were superseded by the V series. μCOM-87, μCOM-87AD The µCOM-87 (µPD7800 etc.) and µCOM-87AD (µPD7810 etc.) are NEC original 8-bit microcontrollers. The μCOM-87AD adds an A/D converter to the μCOM-87. The register configuration consists of two sets of 8 registers each (A, V, B, C, D, E, H, L). The V register is a vector register that stores the upper 8 bits of the address of the working memory area, and the short address space which is fixed in the current 78K series can be freely arranged. The μPD7805 and μPD7806 have only one set of 7 registers (no V register). In the µPD7807 and later, the ALU is expanded to 16 bit and an EA register is added for 16-bit operation. The series came in 64-pin quad in-line package. This series was superseded by the 78K series. μCOM-16 series μCOM-16 The μCOM-16 is a NEC original 16-bit microprocessor, implemented in two chips, the μPD755 (register + ALU) and μPD756 (controller), in 1974. μCOM-1600 The μCOM-1600 (μPD768) is a NEC original single-chip 16-bit microprocessor that was announced in 1978. The processor has 93 basic instructions, consisting of 1 to 3 16-bit words. The memory space of 1 Mbyte (512K words) is byte-addressable. The I/O address space is 2048 bytes. There are 14 general-purpose registers. The processor has a 2-input vector interrupt, DMA control, refresh control for DRAM, and a master/slave mode to enable multiprocessor operation. References muCOM series