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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
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content/history/building-its-own-s-100-bus-based-system.md
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---
title: BUILDING ITS OWN S-100 BUS BASED SYSTEM
date: '1977-01-01'
years:
- '1977'
topics:
- Hardware
params:
when: month unknown 1977
image: /media/history/images/timeline_11-77_s100_1.jpg
oc_id: 19
source:
url: https://web.archive.org/web/20221215134357/http://www.old-computers.com/history/detail.asp?n=19
date: '2022-12-15'
---
![](/media/history/images/timeline_11-77_s100_1.jpg)
In this end of year 1977, when a computer fanatic wished to build himself a powerful and evolutional computer, he'd only have pactically one choice: to purchase a S-100 Bus based system, assembled or in kit form.\
Several manufacturers were selling spare parts allowing to assemble progressively and at low cost a basic system.
The first step consisted in acquiring a box with a power supply and a bus card.\
One had to choose then amongst several CPU cards available: Motorola 6800, MOS 6502, Intel 8080 and 8085 or Zilog Z80. The cards were provided assembled or in kit form. One had then to solder the components on the card.\
A third essential part, the RAM card. It was composed of 2 to 64 Kb of static or dynamic memory chip.
At this stage, the computer was able to operate... providing that one could communicate with it! A teletype or video terminal plugged in the computer's serial port was then necessary.\
After a few days of operation, the user noticed that he would most probably need to buy a backup system to save his programs. For a few hundred $ more, he would rapidly buy a card punch or a cassette recorder with the additional interface card.
Though his computer was working correctly and that our fanatic already spent approximately $1500, he's not yet acquainted that he'll have to spend approximately twice the price in the next months to purchase more memory, communication cards, one or two floppy drives, a printer, a modem...
In 1977, when one would like to acquire a real computer, one had to be passionate, very handy... and rich!
![](/media/history/images/timeline_11-77_s100_2.jpg)