Adjusting Contrast, Backlight And Speaker Volume - DIGITAL-LOGIC MICROSPACE PC/104 Technical User's Manual

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9.2.2 Adjusting Contrast, Backlight and Speaker volume

Function: INCREMENT POTI
Number: E7h
EPP-Version: included since version V3.01.
Description: Increments the selected potentiometer by 1 step. The new value
is stored into the EEPROM of the poti. After power-up the new value is
always available. Maximum 100 steps may be incremented. To arrive to
the middle position, perform 100 step increment and after 50 steps
decrement.
The last call of this function or function E8h must be 20ms back.
Input Values: AH = E7h Function Request
BX = Potentiometer
Output Values: none; all registers are preserved.
Function: DECREMENT POTI
Number: E8h
EPP-Version: included since version V3.01.
Description: Decrements the selected potentiometer by 1 step. The new value
is stored into the EEPROM of the poti. After power-up the new value is
always available. Maximum 100 steps may be decremented. To arrive to
the middle position, perform 100 step increment and after 50 steps
decrement.
The last call of this function or function E7h must be 20ms back.
Input Values: AH = E8h Function Request
BX = Potentiometer
Output Values: none; all registers are preserved.
Function: SOUND
Number: E9h
EPP-Version: included since version V3.01.
Description: Produces a beep. The beep begins with the next timer-interrupt and ends with
the timer-interrupt which follows next.
Input Values: AH = E9h Function Request
AL = (frequency / 128)
Output Values: none; all registers are preserved.
0 = contrast, 1 = backlight, 2 = speaker
0 = contrast, 1 = backlight, 2 = speaker
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MSM486V Manual V3.22