You could probably use MASM from the the DOS 2.0 release [0], build each ASM file as an OBJ, and finally LINK it all together [1]. [0] https://github.com/micro

You could probably use MASM from the the DOS 2.0 release [0], build each ASM file as an OBJ, and finally LINK it all together [1]. [0] https://github.com/microsoft/MS-DOS/blob/master/v2.0/bin/MASM.EXE https://github.com/microsoft/MS-DOS/blob/master/v2.0/bin/MAS... [1] https://github.com/Microsoft/MS-DOS/issues/201 https://github.com/Microsoft/MS-DOS/issues/201