You are describing (with some bits accurate), z/PDOS (sort of) aka PDOS/370 (sort of) aka PDOS/390 It has already run on real hardware.
PDOS-generic is neither the above nor is it PDOS/386 It is a portable OS that assumes the existence of a "specific/suitable" "bios" (I call it a pseudobios) This is the only OS I expect to support in the future. I have 3 distinct OSes - (to some extent) complete rewrites. z/PDOS-generic is simply PDOS-generic on z hardware. z/OS PCDOS is a different way of running z/PDOS-generic - under MVS. The pseudobios is EXEC PGM=BIOS - an unpriviliged program PCDOS is not misleading. It is the counterpart of z/OS Unix. If z/OS Unix is a thing - what do you expect z/OS PCDOS to be? BFN. Paul. On Thu, 7 Aug 2025 16:02:16 -0500, Jon Perryman <[email protected]> wrote: >On Thu, 7 Aug 2025 14:36:04 -0400, Phil Smith III <[email protected]> wrote: > >>>From: IBM Mainframe Discussion List <[email protected]> On Behalf Of >>>Paul Edwards >>>You are required to recompile your "PCDOS" programs with gccmvs to produce >>>S/370 code. > >>Ohhh! That's what I hadn't grokked. That's interesting indeed. OK, > >Let's make this simple to understand from what I can remember about it. Paul >can verify or correct as needed. > >1. Forget the name PCDOS because it's misleading. > >2. It has IPLTEXT that is valid for S370 hardware (maybe S390 & z/Arch). It >loads his program called PCDOS from IBM mainframe disks. > >3. In theory, his program could run on real hardware that his program >supports. > >4. Alternatively, you can emulate that hardware on your PC using the >hercules-390.org software. > >5. Paul mentions GCC (c compiler) which is misleading. You can use the S370 >IPLTEXT with the program compiled for S370. Alternatively, you can use his x86 >boot sector and compile the program for x86. > >6. His program provides a prompt regardless of the hardware. You issue >commands to his prompt. I believe one of the commands is "dir" which I believe >he designed to access the disk VTOC and handle basic dataset access. I believe >he is equating this prompt to a PC / Windows DOS prompt which has a very >limited set of commands that he supports. > >Ask Paul if you have further questions as this is all I can remember from the >discussion years ago. > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, >send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
