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H > HEATHKIT / ZENITH  > ET-3400   


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.


Mendel Cooper's memories:
I built one of these from a kit back in about 1984, I guess. Price was approx. $200 in kit form.
Heathkit used to sell three educational courses based on the ET-3400:
1) Microprocessor Course, EE-3401
2) Microprocessor Interfacing Course, EE-3402
3) Microprocessor Applications Course, EE-3405
Using the specs in the manual, it was pretty easy to build homebrew memory expansion. For a couple of dollars worth of parts, I built a 2K module, using a 6116 (2K x 8) static RAM chip.

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.
NAME  ET-3400
MANUFACTURER  Heathkit / Zenith
TYPE  Home Computer
YEAR  1976
KEYBOARD  17 keys Hexadecimal keypad
CPU  Motorola 6800 then 6808 (1981) and 6802 (1987)
RAM  256 bytes expandable to 1 KB
TEXT MODES  6 x 7-segment LEDs
SIZE / WEIGHT  30.5 (W) x 30.5 (D) x 10.15 (H) cm. / 2 Kgs
POWER SUPPLY  External AC adapter
PERIPHERALS  Prototype area
PRICE  $199.95 Kit, $279.00 assembled, $99.95 for the ET-3401 course

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