IBM 560 - Manual (Page 83)

Output Field
Return Code - Error Status
Auxiliary Return Code - Reserved
Parameter 1
- Reserved
Parameter 2 - Refresh rate capability for
specified mode:
Bit - 6 Hz available.
Bit 1 - 72Hz available.
Bit 2 - 75Hz available.
Bit 3 - 43Hz(I) available.
Bit 4 - 56Hz available.
Bit 5 - 7 Hz available.
Bit 6 - 85Hz available.
Bit 7 - 48Hz(I) available.
Bit 8-15 : Reserved (must be B' ').
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved
ThinkPad 560/560E SMAPI BIOS A-19