I had the Vicmodem 300. Simplex! Flipped a switch on the side to switch between send and receive.
One of my first 'real' programs was an animation which liberally abused the CBM character set.
I gave my whole vic-20 collection complete with 16k RAM expansion pack and dipswitch box to allow 4 carts at once! away at a garage sale in the early 90s.
Protip: Don't use the 16k cart if you need to do any RT shit; it disables the clock. Entirely.
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