I found that MSWindows 4.x (both 95 and 98SE) doesn't like it when a DOS program in a DOS prompt window tries to enter DPMI Protected Mode with the word [PSP:2Ch] of its process holding a zero. My DPMI tests all did this to reduce their memory use. Trying to enter PM is aborted with an error like this then:
> The program encountered an invalid page exception.
>
> Fault location: 0028:C0236811
> Faulting component: DOSMGR(0E) + 00000ED5
> Interrupts in service: None
The exact 8-digit numbers differed in MSW 98SE. I think the "faulting component" had "DOSMGR(0E) + 00000EDD" there.
I reported this as well as a further problem to pcjs: https://github.com/jeffpar/pcjs/issues/75
I first noticed this earlier this weekend when dpmimini would fail while the DOS32 build of NASM entered Protected Mode without a problem. ---
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