The Heathkit/Zenith MicroComputer Learning System model ET-3400 was a very popular item designed to teach principles of computers and programming at universities in the 1970s, and to educate the students of internal computer hardware and software components by self-assembly and programming the machine in pure Hexadecimal language.

It was delivered in assembled or kit form. It also featured a prototype area and could be used as a design aid for developing special interface circuitry with common 6820 parallel interface or 6850 asynchronous chips.

Several software in ROM were also available, among them an Assembler and a Tiny BASIC.

Built-in Language: Monitor in ROM

Keyboard: 17 keys Hexadecimal keypad

Cpu: Motorola 6800 then 6808 (1981) and 6802 (1987)

Speed: 1 MHz

RAM: 256 bytes expandable to 1 KB

ROM: 1 KB

Display: 6 x 7-segment LEDs

Size/weight: 30.5 (W) x 30.5 (D) x 10.15 (H) cm. / 2 Kgs

Price: $199.95 Kit, $279.00 assembled

Manufacturer: Heathkit
Date: 1976

This exhibit has a reference ID of CH44383. Please quote this reference ID in any communication with the Centre for Computing History.

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