Into the OS/2 Multiple Virtual DOS Machines: A better DOS than DOS after all?
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:
Additional reading about OS/2:
Alternative DOS variants:
General Information about CPUs:
Specifics in context of V86 mode, Real Mode, and the A20 gate:
Sources for Vintage Operating Systems:
IBM PC AT:
Visit also THE PHINTAGE COLLECTOR website at 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.
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