yann64andClaude Opus 5.5
b274874139
1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
130 lines
4.7 KiB
Markdown
130 lines
4.7 KiB
Markdown
---
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title: HEATHKIT / ZENITH ET-3400
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categories:
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- Computers
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types:
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- Home Computer
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origins:
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- U.S.A.
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years:
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- '1976'
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cpus:
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- Motorola 6800 then 6808
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params:
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name: ET-3400
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image: /media/museum/photos/heathkit_et3400_system_s1.jpg
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company: /companies/heathkit-zenith
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company_name: HEATHKIT / ZENITH
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specs:
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- label: NAME
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value: ET-3400
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- label: MANUFACTURER
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value: Heathkit / Zenith
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- label: TYPE
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value: Home Computer
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- label: ORIGIN
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value: U.S.A.
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- label: YEAR
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value: '1976'
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- label: BUILT IN LANGUAGE
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value: Monitor in ROM
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- label: KEYBOARD
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value: 17 keys Hexadecimal keypad
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- label: CPU
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value: Motorola 6800 then 6808 (1981) and 6802 (1987)
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- label: SPEED
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value: 1 MHz
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- label: RAM
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value: 256 bytes expandable to 1 KB
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- label: ROM
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value: 1 KB
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- label: TEXT MODES
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value: 6 x 7-segment LEDs
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- label: SIZE / WEIGHT
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value: 30.5 (W) x 30.5 (D) x 10.15 (H) cm. / 2 Kgs
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- label: POWER SUPPLY
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value: External AC adapter
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- label: PERIPHERALS
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value: Prototype area
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- label: PRICE
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value: $199.95 Kit, $279.00 assembled, $99.95 for the ET-3401 course
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tabs:
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- photos
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- emulators
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- links
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forum_thread: 766
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photos:
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- title: 'LARGE VIEW #1'
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subtitle: ''
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text: At power on or after a Reset, 'CPU UP' is displayed.
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image: /media/museum/photos/heathkit_et3400_system_s2.jpg
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- title: 'LARGE VIEW #2'
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subtitle: ''
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text: ''
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image: /media/museum/photos/heathkit_et3400_system_s3.jpg
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- title: REAR SIDE
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subtitle: ''
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text: No connectors and no ability to save typed programs to a tape recorder.
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image: /media/museum/photos/heathkit_et3400_rearside_s1.jpg
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- title: MAIN BOARD
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subtitle: ''
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text: The upper part of the main board is covered by the case.
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image: /media/museum/photos/heathkit_et3400_mainboard_s1.jpg
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- title: MAIN BOARD CLOSE-UP
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subtitle: ''
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text: Each area of the circuitry is clearly marked.
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image: /media/museum/photos/heathkit_et3400_cloeup_s1.jpg
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- title: PROCESSOR CLOSE-UP
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subtitle: ''
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text: Here a 6802 version
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image: /media/museum/photos/heathkit_et3400_proccloseup_1.jpg
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- title: OPENED
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subtitle: ''
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text: A crude power supply unit is fixed to the hidden side of the main board.
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image: /media/museum/photos/heathkit_et3400_opened_s1.jpg
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- title: MANUALS
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subtitle: ''
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text: |-
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The ET-3400 was delivered with a full set of manuals and tests:\
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\- Microprocessors flipchart,\
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\- Two Assembly Language Programming Workbooks,\
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\- An hardware assembly manual,\
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\- A ten chapter reference book,\
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\- Two audio cassettes,\
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\- Two final exam kits(assembly language test and microprocessor test),\
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\- A poster sized schematic of the computer,\
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\- A parts pictorial illustration booklet.
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image: /media/museum/photos/heathkit_et3400_manuals_1.jpg
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emulators:
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- title: ET-3400 simulator
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url: http://www.pilgrimworks.com/trainer.htm
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platform: Windows
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text: ''
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links:
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- title: Heathkit ET-3400 Resources (Yahoo Groups)
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url: http://tech.groups.yahoo.com/group/ET-3400/
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text: Modifications, schematics, manuals and other resources for the Heathkit ET-3400 Microcomputer Learning System.
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oc_id: 785
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source:
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url: https://web.archive.org/web/20230510155752/http://www.old-computers.com/museum/computer.asp?c=785
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date: '2023-05-10'
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---
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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.
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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.
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Several software in ROM were also available. Among them an Assembler and a Tiny BASIC.
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---
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**Mendel Cooper's** memories:\
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I built one of these from a kit back in about 1984, I guess. Price was approx. $200 in kit form.\
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Heathkit used to sell three educational courses based on the ET-3400:\
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1\) Microprocessor Course, EE-3401\
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2\) Microprocessor Interfacing Course, EE-3402\
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3\) Microprocessor Applications Course, EE-3405\
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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.
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<table> <tr> <td></td> <td>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.</td> <td></td> </tr> </table>
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