HP 125

The 125 was the first of the 100 Series personal computers. It came equipped with two Zilog Z80 CPUs to run CP/M operating system. One of the CPUs was used to control terminal functions and I/O activities. The other was used for processing system commands and controlling HP-IB peripherals. The monitor and system unit were integrated into the same "ET Head" housing used by the 262X terminals. An optional internal thermal printer was available. All mass storage was modular and connected via HP-IB. The monochrome screen was twelve inches diagonally and supported 24-line by 80-character text output. The 125 came standard with 64K RAM.