I have one 3.5" disk of software used to interface the original Macs (it's dated 1985) to an X-10 home control unit (which used the CP290 RS232 connection standard). $3 gets it shipped to you in the USA.
FS Mac/ X-10 PowerHouse Interface Software
February 8, 2015 - 9:37am
#1
FS Mac/ X-10 PowerHouse Interface Software