i've trolled thru the boards here looking for an answer, but found none.. hopefully somebody can help?

i'm using flopper to run an img called WIZARDRY 1 (proving grounds of the mad overlord) i can access the master disk, which lets me into the game menu, but then i have to (somehow) change to the scenario disk and when i do this, my PC resets.. what am i doing wrong? how do i swap the img over?

oh yeh - sorry for sounding like a newb.. i kept at it untill i got the master disk working, but i can't seem to get past this disk changing hurdle??