PMI-80
Encyclopedia
The PMI-80 was a primitive single-board microcomputer
produced by Tesla
Piešťany
, Czechoslovakia
, since 1982. It was based on the MHB 8080A CPU
(a Tesla clone of the Intel 8080
), clocked at 1 MHz. Instead of a monitor
output, it had a nine-digit seven-segment
red LED
display showing hexadecimal
numbers. The keyboard was a 25-key calculator
-type keypad with hex and function keys. The PMI-80 had 1 KB
of RAM and the same amount of ROM
. An I/O
card with a DA-converter
and one 0–12 V
analog output could be connected.
Microcomputer
A microcomputer is a computer with a microprocessor as its central processing unit. They are physically small compared to mainframe and minicomputers...
produced by Tesla
Tesla (company)
TESLA was a large, state-owned electrotechnical conglomerate in the former Czechoslovakia....
Piešťany
Pieštany
Piešťany is a town in Slovakia. It is located in the western part of the country within the Trnava Region and is the seat of its own district. It is the biggest and best known spa town in Slovakia and has around 30,000 inhabitants.-History:...
, Czechoslovakia
Czechoslovakia
Czechoslovakia or Czecho-Slovakia was a sovereign state in Central Europe which existed from October 1918, when it declared its independence from the Austro-Hungarian Empire, until 1992...
, since 1982. It was based on the MHB 8080A CPU
Central processing unit
The central processing unit is the portion of a computer system that carries out the instructions of a computer program, to perform the basic arithmetical, logical, and input/output operations of the system. The CPU plays a role somewhat analogous to the brain in the computer. The term has been in...
(a Tesla clone of the Intel 8080
Intel 8080
The Intel 8080 was the second 8-bit microprocessor designed and manufactured by Intel and was released in April 1974. It was an extended and enhanced variant of the earlier 8008 design, although without binary compatibility...
), clocked at 1 MHz. Instead of a monitor
Computer display
A monitor or display is an electronic visual display for computers. The monitor comprises the display device, circuitry, and an enclosure...
output, it had a nine-digit seven-segment
Seven-segment display
A seven-segment display , or seven-segment indicator, is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot-matrix displays...
red LED
Light-emitting diode
A light-emitting diode is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting...
display showing hexadecimal
Hexadecimal
In mathematics and computer science, hexadecimal is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0–9 to represent values zero to nine, and A, B, C, D, E, F to represent values ten to fifteen...
numbers. The keyboard was a 25-key calculator
Calculator
An electronic calculator is a small, portable, usually inexpensive electronic device used to perform the basic operations of arithmetic. Modern calculators are more portable than most computers, though most PDAs are comparable in size to handheld calculators.The first solid-state electronic...
-type keypad with hex and function keys. The PMI-80 had 1 KB
Kilobyte
The kilobyte is a multiple of the unit byte for digital information. Although the prefix kilo- means 1000, the term kilobyte and symbol KB have historically been used to refer to either 1024 bytes or 1000 bytes, dependent upon context, in the fields of computer science and information...
of RAM and the same amount of ROM
Read-only memory
Read-only memory is a class of storage medium used in computers and other electronic devices. Data stored in ROM cannot be modified, or can be modified only slowly or with difficulty, so it is mainly used to distribute firmware .In its strictest sense, ROM refers only...
. An I/O
Input/output
In computing, input/output, or I/O, refers to the communication between an information processing system , and the outside world, possibly a human, or another information processing system. Inputs are the signals or data received by the system, and outputs are the signals or data sent from it...
card with a DA-converter
Digital-to-analog converter
In electronics, a digital-to-analog converter is a device that converts a digital code to an analog signal . An analog-to-digital converter performs the reverse operation...
and one 0–12 V
Volt
The volt is the SI derived unit for electric potential, electric potential difference, and electromotive force. The volt is named in honor of the Italian physicist Alessandro Volta , who invented the voltaic pile, possibly the first chemical battery.- Definition :A single volt is defined as the...
analog output could be connected.
External links
- PMI-80 information – At the OLD-COMPUTERS.COM website