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Ólafur Waage

MS-DOS is now open source, so in a time honored tradition. Lets look for curse words!

github.com/microsoft/MS-DOS

26 April at 8:37 | Open on mastodon.social
16 comments
Ólafur Waage
Ólafur Waage

Look at this compatibility workhorse.

; SFTFromFCB - the workhorse of this compatability crap. Check to see if ; the SFT for the FCB is Good. If so, make ThisSFT point to it. If not ; good, get one from the cache and regenerate it. Overlay the LRU field ; with PID
26 April at 8:38 | Open on mastodon.social
Ólafur Waage

I feel you, I also hate to do this.

; While we hate to do this, we have to. The following data areas are ; expected to be in the CODE segment.
26 April at 8:39 | Open on mastodon.social
Ólafur Waage

That damn C compiler, always up to no good.

* A note about the following " & 0xFF" stuff. This is * to prevent the damn C compiler from converting bytes * to words with the CBW instruction which is NOT correct
26 April at 8:40 | Open on mastodon.social
Ólafur Waage

Very gross, effective? Not sure.

; gross but effective
26 April at 8:43 | Open on mastodon.social
Ólafur Waage

Who doesn't love a gross hack.

; Gross hack: 99% of all disks have 512 bytes per sector. We test for this ; case and apply a really fast algorithm to get the desired results ; ; Divide method takes 158 (XOR and DIV)
26 April at 8:44 | Open on mastodon.social
Ólafur Waage

And there we go, actually not bad for a source codebase. Go read it.

26 April at 8:44 | Open on mastodon.social
Graham Spookyland🎃/Polynomial
Pilum

@gsuberland @olafurw That feels like there's been some unstated four-letter words about a certain three-letter OEM. 😁

26 April at 9:19 | Open on fribygda.no
Charlotte

@olafurw I'll admit a little envy seeing the swears still in there. I once managed to hold up a release of the Xbox OS due to a comment I accidentally checked in describing the resolution of Xbox 360 profile pictures as "crappy" and that triggered a red flag from the policheck source code scan. Ooops 😅

I still maintain that the images were crappy though. Like 128x128 resolution I think? 🙂

26 April at 9:32 | Open on toot.dusepo.co.uk
Stuart
Simon Lucy

@olafurw

A competition to find the data structure and calls that brought about the FTC case that eventually led to the settlement between MS and Novell/Caldera who held DR DOS at the time, might be more interesting.

26 April at 12:07 | Open on mastodon.social
Григорий Клюшников
Ólafur Waage

@grishka ahh, not on the list of words I search for. Added :D

26 April at 17:20 | Open on mastodon.social
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