Atari 400 Technical Reference Manual page 299

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INTERRUPT HANDLER
. TITLE 'SIO ( SERIAL BUS INPUT/OUTPUT CONTROLLER )'
COLLEEN OPERATING SYSTEM
SIO (SERIAL BUS INPUT/OUTPUT CONTROLLER )
WITH SOFTWARE BAUD RATE CORRECTION ON CASSETTE
AL MILLER 3-APR-79
PAGE
THIS MODULE HAS ONE ENTRY POINT. IT IS CALLED BY THE DEVICE
HANDLERS. IT INTERPRETS A PREVIOUSLY ESTABLISHED DEVICE CONTROL
BLOCK (STORED IN GLOBAL RAM) TO ISSUE COMMANDS
TO THE SERIAL BUS TO CONTROL TRANSMITTING AND RECEIVING DATA.
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