millfork/examples/crossplatform/readkeytest.mfk

import stdio
import keyboard
void main() {
    byte c
    ensure_mixedcase()
    while true {
        c = readkey()
        putchar(c)
        putchar(hi_nibble_to_hex(c))
        putchar(lo_nibble_to_hex(c))
        putchar(' ')
    }
}