Just as an update to anyone reading this thread: I tried a completely different install of Windows 98 with both DOSBox 0.70 and 0.65, but got exactly these same results. Seems like a Win98 thing. Is there seriously nobody else who has ever noticed this on Win98? Tried it with Windows XP and it works …

Z:mem gives the same result.

From the looks of your window title bar, it looks like you're using either XP or Vista... I should just try it with XP and see if that fixes it.

Nope, D: is my second hard drive... I only get the warning message when mounting C:\, but not any other letters or locations. Oh well, it's obviously kinda weird, but thanks anyway... And thanks for making the greatest program ever! 😁

I guess I just randomly picked D:, not for any particular reason... *shrug* The same thing happens on drive C: too.

Yes, you have a point... But I was just doing that as a quick proof-of-concept demonstration. 😀 This is not my usual full DOSBox setup, I just got DOSBOX 0.70, and I am just trying this to see if this same weird EMS bug exists in this version (which it apparently does).

I placed a screenshot here: http://lateblt.pdp10.org/DOSBoxEMSWeirdness.png This is an almost-fresh install of DB0.70 on Win98SE; the only config change I've made is, I set xms=, ems=, and umb= all to false in dosbox.conf. Pretty sure it's not a problem with some other mem command getting run, as …

If I set ems=false in my dosbox.conf, then type "mem" immediately upon running DOSBox, it indeed shows no expanded memory. So far so good. However, if I then mount a drive (which, as far as I can tell, is pretty much necessary to really use DOSBox) and then switch to that drive, suddenly 1MB of …