Thanks for your replies, to address your comments in one message: *[1] How did I install FreeDOS on iMac* That was relatively easy once I installed this boot manager: https://www.rodsbooks.com/refind/ With it I can install Linux, Windows and FreeDOS from a bootable CD or USB quite easily and aside of FreeDOS, no Bootcamp is required to start the process. Happy to provide more step by step instructions if they are really required.
*[2] 64bit stub. *Yes I'm aware of the software and the code. The sample code actually ran quite well *[3] As for the errors with DOS16/M exceptions and other errors I'm experiencing.* Actually that has nothing yet to do with 64bit tests I wanted to do. Once I installed FreeDOS I have migrated there a lot of test software to experiment with. Starting from Norton Commander 5.0 and the latest build of Necromancer's DOS Navigator. Tried to launch various demoscene demos of the late 90ties, even tried Doom. Then I tried Open Watcom 1.9 from FreeDOS packages to start compiling some code found to support my experiment. What I found is that unzip provided with the FreeDOS is generating the error. Various DOS4GW based 32bit demoscene demos are causing it and also Open Watcom compiler and wmake is crashing my system with these exceptions as well. Funny Watcom 10.6 works just fine. Additional interesting symptom I see is that when I copy files or unzip files that have lots of files (or perhaps larger one, I'm not sure yet), it just freezes the system endlessly. I just reboot, I have no patience to check if this is some 15 minutes (the longest streak) cache issue or it just crashed with no system or app level handler for it. I will provide exact error in a second when I switch between systems to generate it and add it in another message [4] One more thing perhaps you can help to identify, iMac has *HD Audio *compatible sound card. There was some software written by some Polish dude in the past that was extending Judas Player with HD Audio capacity I found. but when I ran it it effectively discovered HD Audio over PCI but any actual playback and other elements of true driver implementation are not there. Do you know anything about working HD Audio software for DOS? - Best, hollowone On Thu, Nov 12, 2020 at 11:28 AM TK Chia <u1049321...@caramail.com> wrote: > Hello Hollowone PL, > > > With this I have few starter question as a user: > > - DOS16/m is a 16bit protected mode extender. Does it mean that FreeDOS > > runs in 16bit protected mode from the command line or perhaps some driver > > is interfering or rather the iMac I use has hardware that may cause some > > obvious incompatibilities. > > Can you give us more details about the issue(s) you encountered? For > example, which particular tools were you trying to use? What were the > error messages? Was FreeDOS running in "really" Real Mode, or in > Virtual 8086 mode? > > (Meanwhile, my wild guess is that the errors were because the iMac is > not quite compatible with the IBM PC at the lower levels --- especially > the layout of physical memory and I/O ports. But maybe I am wrong.) > > And, I would very much like to know more about how you got FreeDOS > working on a UEFI machine. I have lately been trying to find > information on this. :-) > > Hello Random Liegh, hello Jose Senna, > > >> I'm not sure what DOS16/m is -it sounds like a DPMI server? If so, then > it provides 32-bit addressing >to dos programs. > > AFA I remember, DOS/16M is a DOS extender to allow use of DOS in > protected mode. > > It predates DPMI specification and is geared towards the 16-bit > protected mode > > available in the '286. > > I recall there was the DOS/16M DOS extender --- for the 286's 16-bit > protected mode --- and also DOS/4G --- for the 386's 32-bit protected > mode --- by Rational Software. > > (16M would refer to the 24-bit physical address space supported by the > 286.) > > For some reason, Open Watcom still has some vestigial support for > producing DOS/16M executables, and the OW source code provides some > information on the format of these things. > > Thank you! > > -- > https://github.com/tkchia > > > _______________________________________________ > Freedos-user mailing list > Freedos-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-user >
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