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I ported a large Fortran codebase for mech eng analysis to Xenix from VMS back in the late 80s. We needed more than 640K, so DOS wouldn't do, and this was befor

I ported a large Fortran codebase for mech eng analysis to Xenix from VMS back in the late 80s. We needed more than 640K, so DOS wouldn't do, and this was before Windows. I had to write a device driver for the 68000 based graphics card. That was my first real C coding experience. Fun! I didn't know about BSD at the time, but it looks like Xenix was System V [1]. [1] https://en.wikipedia.org/wiki/Xenix https://en.wikipedia.org/wiki/Xenix

DrScump 9y ago
Did you have a means of using extended or expanded memory? There were memory libraries like DOS/16M that would allow use of extended memory and 80286+ Protected Mode without a lot of source changes. Informix, Lotus, etc. used it for their Protected Mode product line on DOS starting in the late 1980s.