How do they get away with this?

They have an RS232 line going into a digital I/O port using just a =
couple of resistors.

Also, the 7404 as a line driver. How much cable and speed is that good =
for?

www.basicx.com
click on BasicX 24
click BasicX 24 Technical Specifications
click BasicX Schematic

Thanks for any help

John

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