SECTION 6
Conversions and Interfaces
6-84 PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide
INT 15h, Function AX = 5380h, Subfunction BH = 0Dh: Contrast Adjust
NORAPM
Sets value of contrast delta added to default contrast value for any temperature.
Summed value placed in PWM duty cycle register controlling contrast. As duty
cycle register is byteĆwide register, adding values over 256 to default value
decreases contrast via (d duty) % 256. As contrast is
temperatureĆcompensated every 0.125 second, duty added to default value of
temperature as temperature increases or decreases.
This interrupt is a NORAND
Proprietary System interface.
On Entry:
AH = 53h
AL = 80h
BH = 0Dh
BL = Contrast adjustment
On Return:
If successful:
Carry = 0
AH = 0
AL = Undefined
If NOT successful:
Carry = 1
AH = Error Code
AL = Undefined
INT 15h, Function AX = 5380h, Subfunction BH = 0Eh: Backlight Adjust
NORAPM
Sets value of backlight delta added to default backlight value (150). Summed
value put in PWM duty cycle register controlling backlight brightness. As duty
cycle register is byteĆwide register, adding values over 105 to default value
decreases backlight brightness via (d duty) % 256.
This interrupt is a
NORAND Proprietary System interface.
On Entry:
AH = 53h
AL = 80h
BH = 0Eh
BL = Backlight brightness adjustment
On Return:
Carry = 0 if successful:
AH = 0
AL = Undefined
Carry = 1 if NOT successful:
AH = Error Code
AL = Undefined
6. Conversions and
Interfaces
