As promised, here's the table comparing the Mac sync rates (through the Power R) and EGA
So yes, it does look as though the horizontal resolution is the only serious impediment. If you stick to greyscale CRTs (which have a continuous phosphor coating) rather than colour CRTs, or any LCDs, (which have a fixed number of dots) it may not matter at all.
If I'm thinking properly, the vertical resolution shouldn't be a problem either. Once the required number of lines has been drawn, the V sync signal should send the raster back to the beginning of the frame. A little vertical position and size adjustment may be all that's required.
However I bow to the wisdom of those who have posted here with more experience than I as to what might or might not work. It sounds like it's hit and miss whether an individual monitor would sync up or not. Bear in mind that any of these monitors are going to be quite old themselves, and may not like to be strained so.
To them I ask: do things really explode or do they just fail to sync up? If they do sync, is a mere 2% going to add any appreciable strain? And is there a difference in strain between undersync and oversync (+ and -)?
Code:
Power R EGA % off (from EGA)
=======================================================
Reso H 512 640 - 20.0
Reso V 342 350 - 2.3
Scan H kHz 22.3 21.8 + 2.3
Scan V Hz 60 60 0.0
=======================================================If I'm thinking properly, the vertical resolution shouldn't be a problem either. Once the required number of lines has been drawn, the V sync signal should send the raster back to the beginning of the frame. A little vertical position and size adjustment may be all that's required.
However I bow to the wisdom of those who have posted here with more experience than I as to what might or might not work. It sounds like it's hit and miss whether an individual monitor would sync up or not. Bear in mind that any of these monitors are going to be quite old themselves, and may not like to be strained so.
To them I ask: do things really explode or do they just fail to sync up? If they do sync, is a mere 2% going to add any appreciable strain? And is there a difference in strain between undersync and oversync (+ and -)?