SECTION 6
Conversions and Interfaces
6-72 PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide
INT 15h, Function AX = 01F9h: Read V25 Comparator Port
4000API
This system service may not be PC compatible.
On Entry:
AH = 01h
AL = 0F9h
BH = Mask used with the output of PORTT
BL = Trip voltage threshold to compare with
On Return:
BL = PORTT value
Zero = Result of comparison
Set = Current value below input tripĆvoltage threshold
Reset = Current value above input tripĆvoltage threshold
INT 15h, Function AX = 01FAh: Sound Error Beep
4000API
This system service may not be PC compatible.
On Entry:
AH = 01h
AL = 0FAh
CX = Beep duration in milliseconds (Approximate)
On Return:
None
INT 15h, Function AX = 01FBh: Return Pointer to BIOS Version
4000API
This system service may not be PC compatible.
On Entry:
AH = 01h
AL = 0FBh
On Return:
ES:BX = Pointer to nullĆterminated ASCII string containing BIOS version
number. (For example, if /PC switch is used on 4000API,
PC BIOS 3.00" is returned.)
6. Conversions and
Interfaces
