BASIC IN Function

IN

TYPE: USB BASIC system function

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FORMAT: IN ( port )

Action: Reads a byte from the I/O port specified by port.

• port is an expression that reduces to an integer value in the range 0 to 255.

Examples of IN:

PRINT IN(252)

Prints cassette port input status

S=IN(254)

Sets variable S to Printer Ready status

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FORMAT: IN ( address )

Action: Reads a byte from the I/O port specified by the least significant byte of address.

• address is an expression that reduces to an integer value in the range -32768 to 32767.
• Advanced: During the read, address is put on the Z80 address bus.

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plusBASIC enhancement

• address can be an integer value in the range -65535 and 65535 ($0000 to $FFFF).