ntvdmx64

> Wish I could run 16-bit apps tho. https://github.com/otya128/winevdm https://github.com/leecher1337/ntvdmx64

There are several, some based on leaked source, such as this: https://github.com/leecher1337/ntvdmx64 I wrote about some here: https://www.theregister.com/2022/06/28/friday_foss_fest_runn...

Microsoft has just such an emulator. Via Windows source code leaks the NTVDM (Virtual DOS Machine) from 32-bit Windows versions has been built for 64-bit Windows targets[0]. I don't understand why Microsoft chose to kill it. That's not in their character re: backwards compatibility. [0] https://github.com/leecher1337/ntvdmx64 Edit: Some nice discussion about the NTVDMx64 when it was released: https://www.vogons.org/viewtopic.php?t=48443

At least the title is still there in the URL: >can-i-open-16-bit-application-in-windows-8?forum=windows-all&referrer=answers I had good luck using the 32-bit version of W8 & W10. Had to manually enable NTVDM manually beforehand. For 64-bit Widows IIRC it would open in DOSbox, but it was actually a DOS aplication. Now there's this: https://github.com/leecher1337/ntvdmx64

NTVDM has been unofficially built for x64[0] and it works (or rather, worked until MSFT started ripping-out USER32 APIs that are necessary for running Win16 apps). [0] https://github.com/leecher1337/ntvdmx64

One other cool project is that someone ported the SoftPC MS-DOS emulation layer to x86, allowing for 64-bit Windows to run 16-bit DOS software (it couldn't do this without emulation because x86-64 doesn't have access to virtual 8086 mode). Obviously there's DOSBox as well but that doesn't allow for integration into the Windows CLI like this does, so for example you can't pipe the output of a Windows program into a DOS program. https://github.com/leecher1337/ntvdmx64

Microsoft decided not to type "make" for NTVDM on 64-bit versions of Windows (I would argue arbitrarily). It has been unofficially built for 64-bit versions of Windows as a proof-of-concept: https://github.com/leecher1337/ntvdmx64

NTVDM could have been ported to 64-bit Windows, but MSFT declined to do so. Leaked Windows source code shows it would have worked[0]. That would have given 16, 32, and 64 bit compatibility. [0] https://github.com/leecher1337/ntvdmx64

There's a "pirate" port of NTVDM to 64-bit Windows (from leaked NT 4.0 source) so it's certainly not technically infeasible: https://github.com/leecher1337/ntvdmx64

The link in the post to NTVDMx64 at Columbia seems to be broken, but the associated GitHub project appears to be at https://github.com/leecher1337/ntvdmx64 "What is it? =========== NTVDMx64 is a port of the well-known Windows NTVDM, which is used by windows to run DOS-Applications, to 64bit Windows, so that you can run your DOS-Applications on 64bit Windows too." Something I had wanted and didn't know existed!

People who absolutely need to run 16-bit DOS apps on x64 Windows can use NTVDMx64: https://github.com/leecher1337/ntvdmx64

Not natively, but ntvdmx64[0][1] and otvdm[2]/winevdm[3] work fine, albeit a bit slowly. [0]: http://www.columbia.edu/~em36/ntvdmx64.html [1]: https://github.com/leecher1337/ntvdmx64 [2]: http://www.columbia.edu/~em36/otvdm.html [3]: https://github.com/otya128/winevdm --- For those interested, Wikipedia says there's no native/builtin 64bit NTVDM due to > In an x86-64 CPU, virtual 8086 mode is available as a sub-mode only in its legacy mode (for running 16- and 32-bit operating systems), not in the native 64-bit long mode. ... > The NTVDM is not supported on x86-64 editions of Windows,[31] including DOS programs,[32] because NTVDM uses VM86 CPU mode instead of the Local Descriptor Table in order to enable 16‑bits segment required for addressing[33] and AArch64 because Microsoft did not release a full emulator for this incompatible instruct

Try winevdm[1] or ntvdmx64[2], which I believe is based on leaked Microsoft source code. I've successfully gotten Tetris running on win10x64, and I'm happy enough with not needing dosbox+win3x for it. 1: https://github.com/otya128/winevdm 2: https://github.com/leecher1337/ntvdmx64

Well it's here, but you probably have to join the group to get access: https://groups.io/g/dosOrCAD/files/OrCAD%20driver%20without%... I put a copy in one of my github repositories: https://github.com/jhallen/joes-sandbox/blob/master/pcb/orca... I think this is a description of what's going on: https://airborn.com.au/layout/vddtest.html Well this is getting really off topic, but it appears that you can run DOS programs in 64-bit Windows 10: http://www.columbia.edu/~em36/ntvdmx64.html https://github.com/leecher1337/ntvdmx64