Suppressing the KIM-1 echo of TTY input, read non-blocking and make the TTY input deaf.

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Hans Otten

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Jul 2, 2026, 5:59:23 AMJul 2

to PAL 6502 computer

A refreshed page on suppressing the KIM-1 echo of TTY input, read non-blocking and make the TTY input deaf.

Here I present solutions for these problems in software, made possible by the genius hardware design of the KIM-1 TTY I/O.
You can have serial input without echo, non-blocking and even make the TTY input deaf for unwanted input.