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Basic Disk Operating System (BDOS) Functions
4-8
SET I/O BYTE
ENTRY
CL: 08H
DL: I/O Byte
Value
RETURN
FUNCTION 8
SET I/O BYTE
The Set I/O Byte function changes the system 10BYTE value to the value given in
register DL. This function allows transient program access to the 10BYTE in order
to modify the current assignments for the logical devices CONSOLE, READER,
PUNCH, and LIST.
PRINT STRING
ENTRY
CL: 09H
NOTE
CBIOS supports this call dynamically for the
LIST device only (see Chapter 5). However, it
may be used in programs that operate with
standard CP/M calls to the BIOS.
FUNCTION
9
DX: String
Offset
PRINT STRING
RETURN
The Print String function sends the character string stored in memory at the
location addressed by register DX to the logical console device (CONSOLE), 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.
READ CONSOLE BUFFER
ENTRY
CL: OAH
DX: Buffer
Offset
FUNCTION 10
READ CONSOLE BUFFER
RETURN
Console Characters
in Buffer
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