You were always supposed to use rotation feature in the video card for that, which will not help with DOS etc. stuff, only Windows and only when your video card is new enough to have this capability...
I'm not aware of any external solution that can do this.

Tiido wrote on 2022-11-17, 23:34:

You were always supposed to use rotation feature in the video card for that, which will not help with DOS etc. stuff, only Windows and only when your video card is new enough to have this capability...

Well, that's not the answer. You were never supposed to use HDMI for DOS gaming as well, yet here we are...

I don't know of if this is of any help, but I remember hearing about some external video processors that could rotate and/or mirror a picture, you'd just plug it between the source and the monitor.

There's a few companies that made them, but the ones I heard about the most were the Silicon Optix ImageAnyplace, beware though: these are not very easy to find, and might be even a bit on the overkill side (these originally were designed with videoprojectors in mind).

Alternatively, there's Datapath that seem to be making video wall controllers that can rotate video signals, still a overkill solution though, and the current models they make only seem to have HDMI inputs and outputs, so you'd have to run a string of VGA to HDMI and HDMI to VGA adapters.

I'm unaware if there's devices that can just do this kind of picture rotation, there may be others, though.

Vynix wrote on 2022-11-18, 01:08:

I don't know of if this is of any help, but I remember hearing about some external video processors that could rotate and/or mir […]
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I don't know of if this is of any help, but I remember hearing about some external video processors that could rotate and/or mirror a picture, you'd just plug it between the source and the monitor.

There's a few companies that made them, but the ones I heard about the most were the Silicon Optix ImageAnyplace, beware though: these are not very easy to find, and might be even a bit on the overkill side (these originally were designed with videoprojectors in mind).

Alternatively, there's Datapath that seem to be making video wall controllers that can rotate video signals, still a overkill solution though, and the current models they make only seem to have HDMI inputs and outputs, so you'd have to run a string of VGA to HDMI and HDMI to VGA adapters.

I'm unaware if there's devices that can just do this kind of picture rotation, there may be others, though.

D-SUB -> HDMI is still a valid option for me as this monitor has HDMI, DP and DVI too (BenQ GW2765). I will check them out thanks. Although I suspect price may be high (I was hoping for something similar to RGB-to-HDMI or maybe some dedicated FPGA open hardwaresolution).

Edit: The ImageAnyplace 200 would be perfect, a bit too costly though (even used units) but I will look at other available scalers, maybe I will find something cheaper.