If the machine is running now, keep using it till it quits.
Bridgeports conversational is pretty hard to beat for 2 axis machining.
I believe the company is called EMI that specializes in reparing EZ controls
It is pricy to keep them running though.
whats inside that cabinet wont run LinuxCNC
drives and motors are usuable though
Ive owned a couple EZtraks and a Ezpath lathe
Im not talking you out of retrofitting, just that a usb-232 converter would
only let you load programs.