System Services

AH    AL    Description 
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41h         Wait For Event (Power Saving Feature).
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42h         Enter Deep Sleep State (Very Low Power State).
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45h         Window Key & Cursor Tracking Control.  
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46h         Set Display Timeout (for Deep Sleep).  
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47h         Contrast95 (HP 95LX compatible contrast adjust)
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48h         Set Beeper Volume.  
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49h         Set RS-232 Channel (to WIRED or IR).  
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4Ah         RS-232 Power Control.  
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4Bh         Update BIOS Time.  
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4Ch   00h   Select Keyboard (from those provided). 
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      01h   Return Selected Keyboard Type. 
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      02h   Return Available Keyboard Types.  
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      10h   Select Language (English/Non-English).  
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      11h   Return Selected Language.  
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4Dh         Return Model Specific Information.  
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4Eh         Light Sleep Control In Int 16h, Fcns {01h,11h}. 
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4Fh         Keyboard Translation Hook. 
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50h         Batt95 (HP 95LX-compatible battery measurement) 
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51h         Mailbox Service 
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60h         System Power Management 
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      00h   Measure System Battery Voltage 
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      01h   Measure Back Up Battery Voltage
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      02h   Get System Power Status 
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      03h   Set Battery Type 
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      04h   Enable/Disable Battery Charging
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      05h   Set Rate for Periodic Battery Measurements 
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      06h   Voltage Compare 
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61h         Set/Read Annunciator Control 
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62h         Set/Read Display Contrast
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C0h         Return Pointer to System Description Table
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AH = 00h, 01h, 02h, 03h, 04h: Cassette Functions

AH = 41h: WAIT FOR EVENT

AH = 42h: Request Deep Sleep

AH = 45h: Window Keys & Cursor Tracking Control

AH = 46h: Set Display Timeout

AH = 47h: Contrast95 (HP 95LX Compatibility)

AH = 48h: Set Beeper Volume

AH = 49h: Set RS-232 Channel

AH = 4Ah: RS-232 Power Control

AH = 4Bh: Update BIOS Time

AX = 4C00h: Select Keyboard

AX = 4C01h: Return Selected Keyboard Type

AX = 4C02h: Return Available Keyboard Types

AX = 4C10h: Select Language

AX = 4C11h: Return Language Type

AH = 4Dh: Return Model-Specific Information

AH = 4Eh: Light Sleep Control In Int 16h, Fcns {01h,11h}

AH = 4Fh: Keyboard Translation Hook

AH = 50h: Batt95 (HP 95LX Compatibility)

AH = 51h: Mailbox Service (Store/Retrieve word at MailBox[i])

AX = 6000h: Measure System Battery Voltage

AX = 6001h: Measure Backup Battery Voltage

AX = 6002h: Get System Power Status

AX = 6003h: Set Battery Type

AX = 6004h: Enable/Disable Battery Charging

AX = 6005h: Set Rate for Periodic Battery Measurements

AX = 6006h: Voltage Comparison

AH = 61h: Set/Read Annunciator Control

AH = 62h: Set/Read Display Contrast

AH = C0h: Return Pointer to System Description Table