Breadboard 8088 PC Build MS-DOS 4.00 #34

The thirty fourth in a series of videos to create a retro Intel 8088/8086 PC on solderless breadboards and learn about how computer hardware and software works. In this video we build the recently released MS-DOS 4.0 Source code so we can debug the boot up process for the Breadboard 8088 PC.
MS-DOS Source Code github.com/microsoft/MS-DOS
Neozeed website virtuallyfun.com/2024/04/28/c...
Neozeed Source Code github.com/neozeed/dos400
Replacement Characters unix.stackexchange.com/questi...
OS/2 Museum Building MS-DOS 2.11 from scratch www.os2museum.com/wp/dos-2-11...
IBM Technical Reference Guides
IBM Monochrome Display and Printer Adaptor minuszerodegrees.net/oa/OA%20...
PC-XT www.pcjs.org/machines/pcx86/i...
PC-AT www.pcjs.org/machines/pcx86/i...
8088 Project Github github.com/breadboardinglabs/...
Breadboarding Tips • Breadboarding Tips
Improving Breadboard Power • Nanocomp 6809 #17 Impr...
Breadboarding Introduction Video "Prototyping and Experimenting with Breadboards" • Prototyping and Experi...
6809 Project Videos
Nanocomp 6809 Introduction Video • Nanocomp 6809 #1 Intro...
Breadboard VGA in 15 minutes runs Tetris • Breadboard VGA in 15 m...
Nanocomp 6809 in 10 Minutes • 8 Bit Breadboard Micro...
Nanocomp 6809 on Hackaday.io hackaday.io/project/188095-na....
Chapters
0:00 Introduction
0:40 Why MS-DOS 4?
2:07 Build Issues
4:44 Code Page Hell
9:45 GitHub Source Code
11:39 Checkout and merge fixes
15:57 Build MS-DOS 4
20:52 Compare with MS-DOS 4.00 and 4.01
23:55 Boot Sector and Boot Disk
27:32 Booting MS-DOS 4 on DOSBox
31:19 Summary and Next Video

[@neozeed8139]

AWESOME! Glad to see more and more people building their own DOS 4!! Word is that MS is locating the original ZIP files and is going through it so we get a 'proper' release with whatever missing bits are in the source, as it's not ASCII plain text.

[@breadboardinglabs]

That would be good if MS could work with Michal Necasek to get a decent release out (for 2.x, 3.x and 5.x as well would be ideal). Best bet is check in ZIP files with the originals, its not as if they couldn't 'touch' the files with original dates that they needed to cleanse the comments. Dave

[@sdjhgfkshfswdfhskljh3360]

Floppy image with custom boot sector can be created with command line utility BFI (Build Floppy Image). Original website is not accessible anymore, but it's easy to find this program anyway.

[@breadboardinglabs]

Thanks for the info. Have downloaded a copy. Will take a look at it in the coming weeks. Dave

[@sdjhgfkshfswdfhskljh3360]

Why Microsoft can't fix corrupted files and wrong paths? Why users should do it instead?

[@breadboardinglabs]

I think this summarizes the situation quite well! www.os2museum.com/wp/how-not-to-release-historic-source-code/ (Michal Necasek of OS/2 Museum). Dave