System information

FUNCTION 7: GET 1/0 BYTE
Entry Parameters:
Register C: 07H
Returned Value:
Register A: 1/0 Byte Value
The Get I/O Byte function returns the current value of IOBYTE in register A. See Section 6 for
IOBYTE definition.
FUNCTION 8: SET I/0 BYTE
Entry Parameters:
Register C: 08H
Register E: 1/0 Byte Value
The SET I/O Byte function changes the IOBYTE value to that given in register E.
FUNCTION 9: PRINT STRING
Entry Parameters:
Register C: 09H
Registers DE: String Address
The Print String function sends the character string stored in memory at the location given by DE
to the console device, until a $ is encountered in the string. Tabs are expanded as in Function 2,
and checks are made for start/stop scroll and printer echo.
FUNCTION10: READ CONSOLE BUFFER
5.2 Call Conventions CP/M Operating System Manual
5-15