OS/2 provided an often overlooked but superiour environment for running many concurrent DOS applications: Discover the power of OS/2's Multiple Virtual DoS Machines!
And it's more capable than you think, as it could even boot into CP/M, and, with some restrictions, also MS-DOS 7.x (aka "Windows 95", just without the GUI).
But there's some caveats, like the dreaded GATE A20, and also hard drive access needs some tinkering.
Anyways, say hello to OS/2, the "Better DOS than DOS"!
00:00 Intro
00:42 Into the OS/2 DOS MVDM
02:11 Booting DOS into the MVDM: From MS-DOS 4 to MS-DOS 7, PTS-DOS and others
05:10 The Culprit about Windows ME and the A20 Gate
07:48 OS/2 MVDM without full Hardware Abstraction
08:36 How To configure a guest DOS for MVDM
09:53 Dealing with Hard Drives and I/O Errors
12:28 How To exit from the VDM
13:08 Decreasing Boot Time: Starting from C:
14:28 Decreasing Boot Time: Using Disk Images
16:27 Loading Win-OS/2 from a custom DOS VDM
17:18 Loading Win-OS/2 from a MS-DOS 7 VDM
18:05 Pushing the OS/2 MVDM: DOS 1.0 and CP/M
19:27 Conclusion
19:49 Next on TPC: OS/2 "drap door" and Windows 95
Technical Manuals about OS/2:
komh.github.io/os2books/gg243731
komh.github.io/os2books/gg243...
Additional reading about OS/2:
en.wikipedia.org/wiki/OS/2
en.wikipedia.org/wiki/OS/2
www.os2museum.com/wp/os2-hist...
Alternative DOS variants:
en.wikipedia.org/wiki/DR-DOS
en.wikipedia.org/wiki/PTS-DOS
General Information about CPUs:
de.wikipedia.org/wiki/Intel_8...
en.wikipedia.org/wiki/I386
de.wikipedia.org/wiki/Intel_8088
de.wikipedia.org/wiki/Intel_8086
Specifics in context of V86 mode, Real Mode, and the A20 gate:
en.wikipedia.org/wiki/Virtual...
en.wikipedia.org/wiki/A20_line
www.minuszerodegrees.net/5170...
thestarman.pcministry.com/asm...
en.wikipedia.org/wiki/X86_mem...
kajouni.net/info/eng/realmode...
www.byclb.com/TR/Tutorials/mi...
www.c-jump.com/CIS77/ASM/Memor...
www.os2museum.com/wp/the-a20-...
en.wikipedia.org/wiki/High_me...
wiki.osdev.org/A20_Line
Sources for Vintage Operating Systems:
winworldpc.com/product/pc-dos/1x
winworldpc.com/product/pc-dos/2x
winworldpc.com/product/cp-m-8...
winworldpc.com/product/digita...
winworldpc.com/product/digita...
IBM PC AT: en.wikipedia.org/wiki/IBM_Per...
Visit also THE PHINTAGE COLLECTOR website at www.thephintagecollector.ch for insights into my retro computer collection.
Copyright @ 2024 THE PHINTAGE COLLECTOR, Gianpaolo Del Matto. All rights reserved.
Theme Music composed by Abdallah El-Ghannam.
www.fiverr.com/abdallahghannam
Негізгі бет Ғылым және технология Into the OS/2 Multiple Virtual DOS Machines: A better DOS than DOS after all?
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