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How do I use the RS-232C i/o port (a.k.a. “bit-banger”)?

April 26, 2017a.k.a o port RS-232C

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How do I use the RS-232C i/o port (a.k.a. “bit-banger”)?

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If you are in RSDOS, you can connect a modem to the CoCo serial port, rather than through a separate RS-232 Pack. The nice thing in this setting is that you can have a modem and a floppy drive controller connected to the CoCo without needing a Multipak. As far as I know, the fastest you can go using the CoCo serial port is 9600 baud (using Twilight Term). Speeds of up to 19,200 were available using an RS-232 Pack. Under OS-9, it does at 300 baud and sorta-sorta at 1200 (there was a CoCo OS9 BBS ran by Tim Johns at 1200 baud through the bitbanger) and the improved 1200 baud bitbanger driver reportedly does it better, though slowing things down.