I doubt it was networked, as there was never a network card/cart/dongle or anything like that available for the CoCo back in the day (I owned both a CoCo 2 and

I doubt it was networked, as there was never a network card/cart/dongle or anything like that available for the CoCo back in the day (I owned both a CoCo 2 and a CoCo 3 as a kid, and still have both in running condition) - not even from 3rd parties, as far as I can remember. There also was a system for the Model 4 (IIRC) running Xenix (?) with a serial port expander option to allow multiple system communicate with this "server", but that doesn't sound like what was done (?). Radio Shack/Tandy sold a serial port switcher system that allowed you to connect multiple machines together in some fashion. It was meant for an educational setting (a teachers computer connected to multiple student machines). I don't believe it was automated in any way - completely manual. That doesn't sound like it was something that would work for an office setting. In theory, you could mount a multipak interface and drop three serial pak cartridges in it, and maybe tweak the internal electronics to put them at different addresses, leaving the fourth slot open for the floppy drive (or maybe a hard drive). There would also be the bit-banger serial port available - so that would allow you to hang four machines off of a central "server"...third parties also created expanded multipak interfaces that allowed for many more cartridges to be attached (I think up to 16 in some cases). Another way (which if this guy was doing this, he may have done) would be to create a completely custom networking system; the simplest way would be to use the bit-banger port and maybe the cassette port together (you might even be able to do something with the joystick ports too!) - the cassette port, using the relay latching, could toggle between "listen" (RX) and "send" (TX) modes, and with some simple electronics, the voltage levels could be managed and "collisions" detected, so you could do a "round robin" or even a "random" communication protocol with collision detection. Or, some other kind of "one-wire" communication system could be done. I also suppose someone really ambitious could create a custom bit of electronics and multiplex several UARTs together, linked to a single cartridge and controlled by the CoCo. This is kinda fascinating; I wonder if he ever published anything about it. If not, it seems like another small bit of CoCo history lost forever, which is a shame.