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 tie MS1 to GND and leave MS0 open.
On 3/5/2022 09:28, Louis Ohland wrote:
If modern displays lack a Monitor Sense pin[s] needed to enable 31kHz operation, can we add a pass-through HDD15-HDD15 dongle that works on
MS0,1? Or, we could shunt the pins inside the system...
Without the presence of Monitor Sense / Monitor ID, MCGA comes up in
15kHz, something many displays do not support.
--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)