compiling MS-DOS 4.0 from DOS 4.0, on a PS/2!
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With a 16Mhz 80386 it took 70 minutes. I just formatted a blank image on the gotek, copied IO.SYS, MSDOS.SYS and COMMAND.COM, then rebooted. went back to the compiled DOS 4, and re-formatted the floppy as a system disk so the attributes are set. (DOS 5 lets you change system files), and yeah. It can be done!
Let me spell out the steps, in this case I’m going to use Windows 10. I use the git from the WSL (Windows subsystem for Linux) I have DOSBox mount c:\dos as my c: drive . ZIP/UNZIP are Info-ZIP versions, you MUST have the Win32 native version!
continuing from dosbox, you need a 1.44mb fat formatted disk image somedos144.img . I used a dos 6.22 diskette, it needs the bootsector already in place to load io.sys/msdos.sys
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