I vaguely recall my buddy having a 486 (it was a high DX, 100 MHz or more, some of those beasts reached up to 133) with a 14.4 Kb modem back when it was current but my step-father might have had a 9.6 Kb modem on a low 486 SX (25 MHz IIRC), the same the M came with. Actually, I'm pretty sure he had the modem, just not sure which computer it was used with.