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Change the wording of "hardware port" for INPORT/OUTPORT procedures
The new wording "address of I/O ports" is what Intel's x86 Instruction
Set manual calls them, and is more precise.

Add a missing accent mark

Add some tests for PORTOPEN, PORTFLUSH, PORTMODE, PORTCLOSE, and INGAMEPORT

Add a comment explaining why INGAMEPORT accepts a second input, even though it's not used.

Clarify the example of PORTMODE to show that a port must be open first

Correct a misdocumentation that 1 reads both the X and Y axis.
Also document the other supported masks and other minor fixes.

Change a conditional tense to the present tense.
This style is easier to read and matches the rest of the manual.

Fix markup (<parameter> -> <userinput> for a default value).

Fix typo: "then then" -> "then the"

Simplify the example by replacing a long expression with its value:
ARRAYTOLIST LISTTOARRAY "at -> [a t]