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MCGA Monitor

nestor

Veteran Member
Joined
Jul 23, 2010
Messages
509
Location
Spain
Hi,
I recently acquired a PS/2 Model 30 (8086 variant) with MCGA Graphics. It has a standard VGA connector but I found something strange: It has an autosensing or monitor detection that is incompatible with mi cheapo-chinese KVM Switch making the monitor to show a Frequency Overrange message. If I connect the VGA monitor directly the MCGA works correctly.

And now the question: does the MCGA support another kind of monitor than the standard VGA?
 

nestor

Veteran Member
Joined
Jul 23, 2010
Messages
509
Location
Spain
I'm sure it is the MCGA which is failing here:
-If I power on the system with the VGA monitor directly plugged, the image is displayed correctly. Then I unplug the VGA connector and put the KVM Switch (with the system still powered on) and the image is still displayed correctly. But if I reboot, the problem appears (that is why I think there is something like an autosensing feature).
 

IBMMuseum

Veteran Member
Joined
Aug 28, 2006
Messages
1,449
I'm sure it is the MCGA which is failing here:
-If I power on the system with the VGA monitor directly plugged, the image is displayed correctly. Then I unplug the VGA connector and put the KVM Switch (with the system still powered on) and the image is still displayed correctly. But if I reboot, the problem appears (that is why I think there is something like an autosensing feature).

Other PS/2s with VGA cannot work with some KVMs too. There have been multiple topics on the comp.sys.ibm.ps2.hardware newsgroup about it. Raritan and Belkin seem to be the best recommended for PS/2s.
 
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