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FUNCTION 3: READER INPUT
Entry Parameters:
Register C: 03H
Returned Value:
Register A: ASCII Character
The Reader Input function reads the next character from the logical reader into register A. See
the IOBYTE definition in Section 6. Control does not return until the character has been read.
FUNCTION 4: PUNCH OUTPUT
Entry Parameters:
Register C: 04H
Register E: ASCII Character
The Punch Output function sends the character from register E to the logical punch device.
5.2 Call Conventions CP/M Operating System Manual
5-13