Ohhh! That's what I hadn't grokked. That's interesting indeed. OK, so IF it's a 
C program for DOS, you can run it in this z/PDOS environment. Got it.

-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of 
Paul Edwards
Sent: Thursday, August 7, 2025 2:31 PM
To: [email protected]
Subject: Re: z/OS PCDOS

Mike is somewhat right.

You are required to recompile your "PCDOS" programs with gccmvs to produce 
S/370 code.

If the PC had used the S/370 instruction set instead of the 8086 instruction 
set, what would you expect PCDOS to look like? This is it, basically.

Or you can run z/PDOS-generic standalone. It's the same application executables 
being run. gccmvs etc.

In the same way that z/OS and z/VSE use different executables, z/PDOS-generic 
is another OS. But "inspired" by PCDOS.

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