[kerravon86]

The huge memory model supposedly has a 4% overhead in practice, cited by someone who did such programming under OS/2. Personally I wasn't able to detect any slowdown at all, which is not surprising, because you are normally expected to be bottlenecked on some application doing some calculation, not the OS.

I am not aware that I have any obsession with Unix. For PDOS/386, PDOS/86 and PDOS-generic I use an API inspired by MSDOS. For z/PDOS I use the MVS API. I specifically don't want anything to do with Posix which mandated fork() but didn't provide for simple memory allocation.