IBM 560 - Manual (Page 86)

Set Display Device State
Input Field
Major Function Number - 1 h
Minor Function Number - 1h
Parameter 1
- Reserved
Parameter 2 - Request display status
Bit - Built-in display (panel) status
= : Disable
= 1 : Enable
Bit 1 - CRT status
= : Disable
= 1 : Enable
Bit 2 - TV status
= : Disable
= 1 : Enable
Bit 5 - 3 : Reserved
Bit 6 - Monitor Detection Ignore
= : Do not ignore (should be)
= 1 : Ignore
Bit 7 - Dual Enable Flag
= : Disable
= 1 : Enable
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved
Output Field
Return Code - Error Status
Auxiliary Return Code - Reserved
Parameter 1
- Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved
A-22 ThinkPad 560/560E SMAPI BIOS