X,Y,Z

X-Modem 58

XMIT 20, 64, 72, 81-83

XON/XOFF 3, 6-8, 11, 16, 20, 28, 31, 36, 38, 41, 49, 60, 62, 64, 67, 80-83, 116, 140

XON/XOFF handshaking 11, 36, 38, 41, 62, 64, 80

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