https://sierrahelp.com/Documents/TechDocument … stall_Guide.pdf
604,160 bytes free, that is a tough target, if you aren't already going this way, you might need a reboot to DOS rather than a resumeable DOS mode, as there is more overhead in the resumeable. That is, configs set in the PIF, rather than by editing the main ones.
Seems it runs ok in DOSBOX, though that may not be appropriate for 9x
https://www.philscomputerlab.com/ms-dos-mode-super-easy.html
If you attempt to tune the existing config, you can drop to dos and exit back to Windows, but overheads are higher. Specify a new MSDOS configuration causes a reboot to DOS, and a reboot back to Windows, slower, but more powerful in getting a tighter setup

I can confirm it works under MSDOS 7.x. That error shows up if the CPU is too fast, iirc.

TheMLGladiator wrote on 2026-02-16, 03:25:

I can confirm it works under MSDOS 7.x. That error shows up if the CPU is too fast, iirc.

Do you have any idea what the upper limit is? The slowest machine I own these days is a AMD Am586 133. So basically a supercharged 486, I tried it on that, my Pentium 233MMX machine, and my Pentium III 500 laptop.

I can confirm it runs on my Intel P133 under DOS 7.1.

I can confirm it works on my P166 under DOS 7.1 (112Mb RAM - Intel 430FX )

I played it in Windows XP NTVDM back in the day. You'd think that it can be made to work in a 9x DOS box.

How much conventional memory is available in the environment you are trying to run the game? What is the ouptut of mem/c/p?

torpedo wrote on 2026-02-16, 11:40:

I played it in Windows XP NTVDM back in the day. You'd think that it can be made to work in a 9x DOS box.

I'm not trying to use a DOS box, I am indeed using the Restart to MS-DOS package from PhilsComputerLab. I've also tried modifying the base Exit to DOS shortcut the start menu restart to DOS option calls up.