Its coded in GCC. On Thu, Aug 7, 2025 at 12:12 PM Phil Smith III <[email protected]> wrote:
> So what is translating the x86 opcodes to Z opcodes? > > -----Original Message----- > From: IBM Mainframe Discussion List <[email protected]> On Behalf > Of Paul Edwards > Sent: Tuesday, August 5, 2025 9:07 PM > To: [email protected] > Subject: Re: z/OS PCDOS > > On Tue, 5 Aug 2025 18:08:37 -0400, Phil Smith III <[email protected]> wrote: > > >This is...interesting, but what is the goal? Or is it just an interest > >project? (Nothing wrong with that!) > > > >Another "interest project": Way back in 2000, Adam Thornton fired up > Linux under VM/ESA on a P/390. In Linux, he ran Bochs. In Bochs, he ran > Windows. In Windows, he ran Exchange. > > > >Well, maybe "ran" isn't the right word: more like "crawled". But it DID > come up. Eventually. On modern hardware, might even be tolerable! > > > I just realized something - you might have the wrong idea of what z/OS > PCDOS is. This is not emulation. It runs applications natively on z/Arch. > ie full speed. > > The applications are not MVS executables though. They are z/PDOS-generic > executables. I do happen to use the MVS load module format though. But > that's not very important because I have my own loader, so could have used > a different format. And indeed, I intend to use PE/COFF format for z/OS > Windows. > > But once the executable is loaded, regardless of format, it is directly > executed. There is no emulation. There isn't even a VM (which also means > that if there are any bugs in your application, it can crash z/OS PCDOS, ie > the EXEC PGM=BIOS will get a S0C4 or whatever). The lack of VM means I > don't need privilege. > > ie any MVS end user can install this software and have an EBCDIC FAT32 > system running .exe files at full z/Arch speed. With long filenames too > (although you can't see that in the "dir" display currently, because it has > been implemented in a crude manner to focus on important technical things). > > BFN. Paul. > > ---------------------------------------------------------------------- > 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 > -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
