It calls INT 13/05 to format tracks, for which official DOSBox returns an error, but the Daum build fakes success. The map generator also depends on divide exception behavior of the 8086/8088 that is not supported in DOSBox.

I made a workaround program for both issues -- it's a bit more complicated than a normal TSR because it has to remain resident after booting. Run it in DOSBox before booting the disk images. When the program is resident, the format function fakes success; and the divide exception returns to the instruction following the divide instruction, which is significant in this case, but there are still no exception conditions specific to 8086/8088 (might not be significant).

Thanks 😀 It works great!

BTW, it's probably best if the map disk is blank, ideally filled with 0xf6 bytes, since no formatting is actually done. Reusing a previously written map disk might cause problems.

I usually use WinImage to create blank disks of whatever size a game calls for. It fills it with 0x00 bytes though. Hopefully that won't be a problem. I'm already playing a random map now. Hopefully I won't run into any problems later.