The Micro-Professor MPF-I, introduced in 1981 by Multitech (which, in 1987, changed its name to Acer), was the first branded computer product from Multitech and probably one of the world's longest selling computers. The MPF-I, specifically designed to teach the fundamentals of machine code and assembly language, is a simple and easy to use training system for the Zilog Z80 microprocessor.

The MPF-I does not look like a typical Microcomputer. It is enclosed in a vacuum formed plastic book case often used to store a copy of a language textbook, two audio cassettes, and a training manual. When closed, the MPF-I can be placed on a bookshelf for easy storage and looks just like a book or a file. This form factor made the computer more appealing to the buyers, since it could be stored away with ease, and it could blend in with the office or home.

Programs are entered into the MPF-I using Z80 machine code in hexadecimal format. The MPF-I monitor program displays both an address and data stored at that address simultaneously using a seven-segment display. There is a spare DIP socket for adding additional ROM or RAM to the MPF-I. There are also two 3.5mm audio jacks on the top right of the computer, these are to communicate with the audio cassettes that are used to store programs and code typed into the machine. One is used to read the drive and the other is used to write data; on a conventional audio cassette deck the wires would be connected to the headphone and microphone ports. This type of data storage is similar to that of a Radio Shack TRS-80 or the Sinclair ZX-81, which similarly used audio cassettes to store programs the user typed, as well as commercial programs and games the user could buy.

Keyboard layout

Keyboard layout op de Multitech versie.

MPF-1B

Later Multitech introduced a Tiny-Basic for the MPF-1. The Monitor and Basic fitted into one 4 kByte ROM, replacing the 2 kByte monitor-only ROM. This configuration was marketed as the MPF-1B.

Basic is started on 0X0800.

Overlay voor Basic.

MPF-1P

In 1984 Multitech introduced the MPF-1P or MPF-Plus, an evolution of the MPF-1 as it had the same form factor. It featured a single line 20-digit, 14-segment fluorescent display and a click-type QWERTY keyboard. It had the same expansion connector as the MPF-1 (strictly a Z80-CPU pin-header), so several of the MPF-1 expansion boards could be used on the MPF-1P. It was more a Basic computer than the MPF-1, with an assembler and disassembler as part of the firmware (8Kbyte). The MPF-1P featured 4 kByte static RAM, with optional battery backup.