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TS-5700 User's Manual
Int 15h / Function A1h – Console I/O Redirection
This function specifies the device that will be used by the BIOS to direct console input (INT 16h) and console
output (INT 10h). If the LCD or Matrix keypad is to be used as the console, you must also call the LCD and/or
Matrix keypad BIOS function to enable them.
ENTRY:
AX = A1h
BH = 00 - Console is directed to Standard I/O. (VGA/keyboard or LCD/Matrix)
BH = 01 - Console is redirected to COM1
BH = 02 - Console is redirected to COM2
BH = 03 - Console is redirected to COM3
BH = 04 - Console is redirected to COM4
EXIT:
CY = 0 if success, set if failure (carry flag)
AH = 00 if no error, 86h if no supported by BIOS
Int 15h / Function B020h - Jumper Pin Status
This function returns the status of the option jumpers in register BX according to the list below.
ENTRY:
AX = B020h
EXIT:
CY = 0 (carry flag)
AX = 0
BX = Jumper Pin Status. If Bit X = 1, the jumper is installed.
Table E Int15h/Function B020h register BX return
values
BX Bit
Jumper
0
JP1
Auto CMOS configuration
1
JP2
Console Redirected to COM port
2
JP3
Write enable Flash A:
3
JP4
Console set to 115K baud
4
JP5
User definable
5
JP6
Console to COM1
Technologic Systems
Description
44
http://embeddedARM.com/
5/2009
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