On 11/5/2017 3:13 AM, Patrick Schluter wrote:
On Sunday, 5 November 2017 at 09:17:37 UTC, Walter Bright wrote:
I run dmd regularly on an XP box, but that just means dmd itself runs on XP.
(I converted the front end of DMC++ to D, using DMD in -betterC mode, and XP
is the last operating system that supports DOS programs. XP has the DOS DMC++
test suite on it.)
I don't think that's true. It's a 32bit/64bit division, not a Windows version
thing. A 32 bits installation can run 16 bits and 32 bits programs, a 64 bits
version can run natively 32 bits and 64 bits programs. None can run all 3 modes
natively.
Is that an issue with the CPU, or the operating system?
I know with certainty that Windows 8.1 32 bits installation could still run DOS
and Windows 16 bits apps. I haven't seen evidence to the contrary for Windows 10.
Windows XP was the last version that was installed massively in 32 bits mode.
From Vista on, the proportion of 32 bits installations (and thus losing 16 bits
support) dwindeled.
Windows 7 64 bit will not run 16 bit programs. Try it and you get a dialog box
"Unsupported 16-Bit Application". I haven't tried Win 7 32, but some googling
around shows you are correct.
