Heathkit ET-3400 Trainer

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
17 keys Hexadecimal keypad
Motorola 6800 then 6808 (1981) and 6802 (1987)
1 MHz
256 bytes expandable to 1 KB
1 KB
6 x 7-segment LEDs
30.5 (W) x 30.5 (D) x 10.15 (H) cm. / 2 Kgs
$199.95 Kit, $279.00 assembled

Manufacturer: Heathkit
Date: 1976

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


Heathkit ET-3400 Trainer

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