@adamsdesk well, according to @rasteri zhis works because #MDA has it's own #DMA address space vs. #CGA / #HGA / #EGA / #VGA, so in theory #Linux should be able to implement this, tho I'm nit shure if current versions of Linux still support it.
That being said this does require a setup with a seperate #MDA card exclusively occupying it's address space and a #VGA adaptor that ignores it.
Also this combo is rather uncommon and basically died with multi-display cards in lieu of #TTY-Terminal access.
A little question to some old #Linux pros: Does `Linux` also support that #DOS-like #DualMonitor with #MDA output on one screen and #VGA on a [second screen?](https://www.youtube.com/watch?v=ERMr1Rosq0s&t=1130) (video via @[email protected] ) Cuz I'd love to support that in [`_OS/1337`](https://github.com/OS-1337/OS1337) as a *neat* option to optionally output anything else than 80×25 #TUI… #OS1337
So i'm going through the EGABIOS.ROM and we know it has two fonts: 8x8 for the lo-res modes and 8x14 for the hi-res modes. I'm making a TTF font from these ROM bitmaps, and I'm reviewing the characters; in particular the shade characters at 0xB0 0xB1 0xB2 (now called LIGHT/MEDIUM/DARK SHADE in Unicode).
Looks fine in 8x14 (on left); looks corrupt on 8x8 (on right). In particular 0xB2 does not have a regular 3/4 grid.
I checked that my tools were correctly converting the ROM bitmaps, they were. I checked that the ROM bitmaps were as listed in the IBM EGA Manual, they were.
Did it really display like that on an actual PC with EGA card? (i don't know, but i did get an emulator to show me; see following post).