Thanks for the help. The attached patch includes spaces around all operators, doesn't include the void cast, and doesn't mention (E)DR-DOS any longer. I recently learned that the dl register requirement is present in prior releases of the FreeDOS kernel too, still called DOS-C. These DOS-C releases already are under GPLv2+ so I hope it is okay to mention them in the comment, as the attached patch does.
Regards, Chris
improve-freedos-compatibility-2.diff
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