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Adding EMS support is on the issue list. https://github.com/FrenkelS/Doom8088/issues/1

QEMM was created for the 286 (see QRAM) https://en.wikipedia.org/wiki/QEMM

EMS only let's you have a 64kb frame, I don't think it matters if it's 286 or not.

A 286 doesn't need EMS though. You can use XMS or a 16-bit DOS extender and run in protected mode to access all memory.

You mentioned EMS that's why I brought it up.

On a 286 sure you can go to protected mode but AFAIK that tended to be more involved than most people would like.

In the case of XMS, that could help but still requires moving data to/from EMB.

Frankly EMS would be the best option to keep it workable on an 8088. At the very least the 64k frames could be used for some of the data that I'm guessing are streamed (belched?) from disk.