Category Archives: Source code

How Not To Release Historic Source Code

Posted on April 26, 2024 by Michal Necasek

This is how to not do it: GitHub Don’t get me wrong, it’s absolutely brilliant that Microsoft was able to release a fairly complete (minus DOSSHELL) source code for MS-DOS 4.00 or 4.01 (see below). As much as it was … Continue reading →

Posted in Development, DOS, Source code | 82 Comments

386MAX and EISA DMA

Posted on September 28, 2023 by Michal Necasek

A few weeks back I was reminded that the source code to the 386MAX (later Qualitas MAX) memory manager was released in 2022 on github. Back in the 1990s I used primarily EMM386 and QEMM, but I have some experience … Continue reading →

Posted in 386MAX, DOS, EISA, Source code | 11 Comments

Windows 9x Video Minidriver Source Code

Posted on June 24, 2022 by Michal Necasek

As promised, here is the source code for the Windows 9x VirtualBox display minidriver. For discussion of the source code, see the included readdev.txt file. The code was developed on a Windows 10 host system. For extra credit, I attempted … Continue reading →

Posted in Development, Source code, VirtualBox, Watcom, Windows 95 | 18 Comments

Well Hello

Posted on July 14, 2020 by Michal Necasek

So after some furious disassembling, assembling, and linking, things got this far: It took longer than it ought to have because although IDA is great, I couldn’t figure out how to make it work with GW-BASIC’s bizarre segment usage. The … Continue reading →

Posted in Compaq, Microsoft, PC history, Source code | 7 Comments

GW-BASIC Source Notes

Posted on June 23, 2020 by Michal Necasek

When I learned that Microsoft released the GW-BASIC source code, I was mildly curious to find out what is or isn’t there. The short answer is that there’s a whole lot, but a lot is also missing. Spelling note: Both … Continue reading →

Posted in Microsoft, PC history, Source code | 20 Comments

Microsoft Editor

Posted on March 11, 2018 by tenox

(This is a guest post by Antoni Sawicki aka Tenox) In a recent blog post I lamented the lack of a good console/cmd/PowerShell text editor for Windows. During the process I made a rather interesting discovery, that in a fact … Continue reading →

Posted in Development, DOS, Editors, Microsoft, NT, OS/2, Source code, Uncategorized | 23 Comments

PC-MOS/386 Source Code

Posted on October 5, 2017 by Michal Necasek

I missed this when it was initially announced. The source code for PC-MOS/386 version 5.01 is now available on github under the GPLv3 license. It requires the user to supply Borland C++ 3.1 in order to build, but there are … Continue reading →

Posted in 386, DOS, Source code | 8 Comments

Any Soundscape VIVO fans here?

Posted on May 12, 2016 by Michal Necasek

While digging into the implementation of Sound Blaster compatibility on PCI cards, I found an unexpected gem. Ensoniq’s U.S. Patent 5,790,837 includes partial source code for the Sound Blaster emulation driver used with the Ensoniq Soundscape VIVO boards, SSINIT.COM. The VIVO boards were … Continue reading →

Posted in Ensoniq, Sound, Sound Blaster, Source code | 6 Comments

NT Video Miniport for VirtualBox, With Source Code

Posted on August 1, 2014 by Michal Necasek

Note: See also an updated version. Upon reader request, the OS/2 Museum is publishing the source code to the NT video miniport driver for VirtualBox. To recap, this is a NT video miniport which allows 32-bit NT versions to use high-resolution graphics … Continue reading →

Posted in Graphics, NT, Source code, VirtualBox | 48 Comments