Some issues booting beta versions of Multitasking DOS 4.0 were reported on Discord. These images boot on 86box
Multitasking DOS 4 beta build 2.06 (May 1984) refuses to boot in MartyPC 0.2.2 s
May 1985 (build 4.11, recently discovered) also does not boot
Some issues booting beta versions of Multitasking DOS 4.0 were reported on Discord. These images boot on 86box