5.16.1 Cauxin
Name: »Character auxiliary input« - Input via serial port.
Opcode: 3
Syntax: int32_t Cauxin ( void );
Description: The GEMDOS routine Cauxin reads a character byte from the GEMDOS handle 2 - normally the serial port aux:. The function waits until the character arrives.

Note: Atari recommends use of the BIOS function Bconin for this, as Cauxin can cause problems when its handle is redirected and end-of-file is encountered.
Return value: The function returns the read-in character in the low byte of the returned WORD.Availability: All GEMDOS versions.