This keyboard and the Morse MKB-1 use a character coding scheme I have never seen before. A wire from each key is threaded (or not) through a series of toroids, one for each “bit” in a character. Through is mark, skip is space. Similarly for dot-dash in the Morse version. A pulse is fired through the wire when a key is depressed and the secondary of the toroid sets the corresponding bit in a shift register. Cool!

Nick England K4NYW
www.navy-radio.com

On Wed, Oct 2, 2024 at 4:50 PM W2HX <w2hx@w2hx.com> wrote:

HAL had this TTY keyboard with a loop interface. Anyone have any documentation on this? Google was not fruitful.

73 Eugene W2HX
My Youtube Channel: https://www.youtube.com/@w2hx/videos

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