American Megatrends SX-10 Preliminary Manual page 43

* CTS & RTS Shorted.
This test exercises the port for different :
* Baud Rates
* 7 Bit / 8 Bit &
* Odd / Even Parity
The results of the test are displayed on the screen.
Printer Port Test
This test writes a pattern on the Printer & the results are observed on the
Printer.