Here's a link to the page on the Completely Free Software website where you can download this game from. As of right now, it's fourth from the bottom of the page: http://www.completelyfreesoftware.com/gg1_w31.html
Some people have been reporting that the file download at CFS is coming up as a malware/virus. I can assure you it's not and that those are false positives. Part of the reason this may be happening is because the CFS website isn't well known and the file was updated not long before my review went live to add a missing data file.
Another option for playing the game in a more modern way is to download one of the remakes out there, of which there are several, NONE of which use the original source code, much to my surprise! (Originally posted that they did..., whoops.) Anyways, a good article which has a bunch of them compiled together in one spot can be found here: http://www.indieretronews.com/2012/12/dune-2-history-and-remakes.html
Turns out Tandy audio IS supported... but the game will refuse to use it unless it expicitly detects a Tandy machine in place. DOSBox emulates Tandy machines easily enough, but doesn't provide higher graphics support for EGA/MCGA/VGA/etc. when it does, so you can get the Tandy audio working in DOSBox if you don't mind having a blank screen. Alternatively, there might be some unofficial builds of DOSBox out there which can emulate a Tandy machine type with a better graphics device, but I don't know enough about those builds to say for certain. I'm also told the Tandy 3-Voice sound in this game isn't so great so it probably isn't worth the effort to get working. :P
I was actually playing v1.0, not the patched version, over the course of this review. It's possible some of the things I discussed were fixed in the patched version, although from what I understand even that version is still buggy. There's also a fan-made patch out there which fixes even more issues so that's another thing to go looking up if you're so inclined.
Although you might think the unit-limit is memory related, it's actually not. If you know how to edit the mission files you can jack the unit limits as high as you want. Have fun manually controlling 100 units though... :P
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