https://ardent-tool.com/docs/pdf/PS2_Model_25_Technical_Reference_Jun87.pdf#page=49
Page 65 physical
Display Sense Register, Index 12: This register contains the sensed
levels of the monitor sense 1 and 0 signals at pins 13 and 14 of the
display connector [HDD15]. This information is used by BIOS to properly initialize all video registers to match the display.
Figure 1-41 Monitor Sense Bits
MS1 MS0 Type of Display Attached
0 0 Reserved
0 1 Analog Monochrome Display
1 0 Analog Color Display
1 1 No Display Attached
0 = Shunt
1 = Open
So, if my years of advanced hedonism haven't totally destroyed too many
brain cells, we leave MS1 open and tie MS0 to GND.
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