https://github.com/kulp/soylent

An aspirational hardware design for a tiny (300-baud FSK) modem for the TI Silent 707 teletype
https://github.com/kulp/soylent

avr hardware kicad

Last synced: 3 months ago
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An aspirational hardware design for a tiny (300-baud FSK) modem for the TI Silent 707 teletype

• Host: GitHub
• URL: https://github.com/kulp/soylent
• Owner: kulp
• Created: 2019-12-31T18:21:22.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2023-01-25T00:37:48.000Z (over 3 years ago)
• Last Synced: 2025-02-08T22:15:43.925Z (over 1 year ago)
• Topics: avr, hardware, kicad
• Size: 443 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# soylent

![3d rendering of soylent](doc/soylent3d_0.jpg)

`soylent` is an "aspirational" (i.e. entirely untested, and designed by an electronics neophyte) hardware design for a tiny hardware modem for the TI Silent 707 briefcase teletype from the [Texas Instruments Silent 700 series](https://en.wikipedia.org/wiki/Silent_700).

The teletype speaks 300-baud [FSK](https://en.wikipedia.org/wiki/Frequency-shift_keying) using the [Bell 103 dataset](https://en.wikipedia.org/wiki/Bell_103_modem). The modem is designed to connect directly to the acoustic-coupler interface of the teletype, which supplies power to the modem as well as providing the FSK audio signal. The modem is designed to implement full-duplex translation between the FSK signal and a minimal [RS-232](https://en.wikipedia.org/wiki/RS-232) serial connection at 300bps.

The intention is for the [tynsel](https://github.com/kulp/tynsel) project to supply a software implementation for the [AVR microcontroller](https://www.microchip.com/wwwproducts/en/ATTINY412) in the `soylent` design. For now, `soylent` serves mainly as a playground for the author to learn [KiCad](https://kicad-pcb.org).