EDR-DOS unsupported in dosemu
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#223 EDR-DOS unsupported in dosemu
EDR-DOS is now a fork from the original Caldera OpenDOS. A few elements of FreeDOS are incorporated (e.g., its SYS command was adapted from FreeDOS's). EDR-DOS can be found at http://www.drdosprojects.de/ .
Unlike its predecessors, EDR-DOS does not use IBM???.COM for its two hidden system files. Instead it uses DRBIO.SYS and DRDOS.SYS.
When invoking dosemu, I get an error that no operating system is installed. I tried making symlinks using the IBM???.COM names but got the same result.
I compiled dosemu 1.4.0 in Debian 4.0 for amd64, compiling it for 64 bits. Lineo's DR-DOS 7.03 does work for me. Everything runs in ~/drdos on an ext3 partition.
dosemu is doing the guesses based on the file names.
Instead of symlinking to ibmbio.com/ibmdos.com, try
symlinking to io.sys/msdos.sys.