"CPU error: incorrect opcode. Killing process"

I get the same error message but I get it when I try to run an old DOS game.

The files shouldn't be corrupted, because the game runs fine with DOSbox under XP.
My processor is not fast enough for DOSbox, though, so I want to run it in DOS 7.10.

DOSbox says it's for older games that need protected memory. Is there a way to create that protected memory / "protected mode" manually in DOS 7.10 ?

"CPU error" really means "Program runtime error" in this case.

To create protected memory / "protected mode", you need some sort of protect mode server, e.g. DPMI host/driver. Most DOS protected mode programs should come with this driver.

Note that some DOS programs will only work with certain configuration of EMM386 or so, e.g. EMM386 RAM (both UMB and EMS), EMM386 NOEMS, or no EMM386 (i.e. don't load EMM386).

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Long Live DOS!