Micro-Professor MPF-I

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Micro-Professor MPF-I
Mpf-I.jpg
Microprofessor I
Also known asMPF-1
MPF-1A
MPF-1B
Developer Multitech
Manufacturer Multitech (1981-1993) [1]
Flite Electronics International Limited (1993-) [2] [3]
Release date1981;43 years ago (1981)
Introductory price$149
Operating system 2 kByte monitor ROM
CPU Zilog Z80 @ 1.79 MHz
Memory2 kByte RAM
Storage Compact Cassette
DisplaySix digit 7-segment display.
SoundBeeper
InputHexadecimal calculator-type keyboard (36 keys including, 16 hexadecimal keys, 19 function keys, and one user-definable key)
Power5.0v via 7805 from 9.0V at 500mA mains adapter
SuccessorMPF-1 Plus

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

Contents

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. [4] 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.

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.

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.

1985 saw the release of the MPF-I/88, the latest in the MPF-I line. It was an Intel 8088 based single board computer with a two-line LCD screen.

On 24 February 1993, Flite Electronics International Limited in Southampton, England, at that time an international distributor for Acer, purchased the copyright to the MPF-I's training manuals, as well as its firmware and hardware intellectual property rights from Acer. Flite is still manufacturing small batches of the MPF1B at a sub-contract manufacturing facility in Havant, England.

Modern Extensions

PicoRAM 6116 is a 6116 SRAM emulator and SD card interface for the Microprofessor based on the Raspberry Pi Pico. It facilitates store and restore of complete SRAM memory dumps. PicoRAM 6116 also supports HEX files generated by Z80 assemblers, hence facilitating a modern software development tool chain, i.e., by using PC-based assemblers and file transfer of the generated HEX files to the Microprofessor via SD card.

See also

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References

  1. ↑ "Summary of Acer Milestones: Acer America". Archived from the original on 1 July 2003. Retrieved 1 May 2004.{{cite web}}: CS1 maint: bot: original URL status unknown (link), 1981:MicroProfessor-I becomes the company's first branded product.
  2. ↑ Flite Electronics – International Supplier of the Microprofessor Training System (archived content)
  3. ↑ Yet another computer museum - Multitech MPF-1
  4. ↑ "Computer Data Cassette Formats". retrotechnology.com. Retrieved 25 October 2019.
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