The Color Computer had three main RS232 / Serial interfaces available:

• The built-in MPU-controlled serial port, known as the “bitbanger”
• The Deluxe RS232 Pak
• The Direct Connect Modem Pak

Deluxe RS232 Pak - CoCopedia - The Tandy/Radio Shack Color Computer Wiki

B protocol - Wikipedia

Kermit Software Source Code Archive

WiFi CoCo for $15 (or for any retro computer with an RS-232 port) | Sub-Etha Software

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