• Please review our updated Terms and Rules here
  • Exhibitor application for VCF West 2022 is now open! If you are interested in exhibiting, please fill out the form here.
  • Here are the results of the VCF East 2022 Post Event Survey: Survey Results

MS-DOS 4 Mutli-tasking version?

Chromedome45

Veteran Member
Joined
Jul 6, 2009
Messages
3,828
Location
Central Florida
Was there ever such a thing as MS-DOS 4 multitasking version? Kind of an OS/2 pre-cursor? And it was only available in Europe? Just curios.
 

nestor

Veteran Member
Joined
Jul 23, 2010
Messages
509
Location
Spain
Yes, there is a MS DOS 4.0 version around with a task switcher and some other goods... I think it was not released to public, it was a custom version.
 

krebizfan

Veteran Member
Joined
May 23, 2009
Messages
5,338
Location
Connecticut
It is close to running Windows 1.x without the GUI elements. All the regular DOS applications run in conjunction with PIF files; a rudimentary task switcher (similar to that used in OS/2 1.0) handles them and a handful of DOS 4 New Executable applications. All delightfully wacky.

See http://jsmachines.net/videos/pcjs/ for an example of how it works. Set the virtual disks to DOS 4 M. Use the <ALT> key to enter the task switcher.
 

barythrin

Veteran Member
Joined
Oct 5, 2005
Messages
6,256
Location
Texas
What brought it to your attention out of curiosity? I'd only been aware of PC-MOS and MP/M for multiuser dos / CP/M. I used to try replacing progman.exe with command.com and was able to have a multitasking dos environment using later windows (3.x) but admittedly it was cumbersome.
 

Caluser2000

Banned
Joined
Jan 3, 2010
Messages
4,600
Location
New Zealand
I think I saw it in Gordon Letwins book Designing OS/2. Just a brief blurb about it.

Wikipedia mentions it:

Apricot Computers pre-announces MS-DOS 4.0, the first multitasking version. Apricot will sell MS-DOS 4.0 to European customers as the controlling program for network servers that support a new family of Apricot microcomputers. Apricot will also offer MS-Net 2, a new version of Microsoft's LAN. Developers and industry insiders expect Microsoft to bypass that version in the United States in favor of a more powerful version, MS-DOS 5.0, which will access up to 16 MB of RAM

Also found this- http://books.google.co.nz/books?id=pzwEAAAAMBAJ&pg=PA6&lpg=PA6&dq=Multi+tasking+ms+dos+4&source=bl&ots=U4QkX-2Fk6&sig=jIUIVjdl_gvIfEKjfsfJm9CKeVI&hl=en&sa=X&ei=O_9kUfv6BoKFiAeLsIFQ&ved=0CCEQ6AEwAjgU#v=onepage&q=Multi tasking ms dos 4&f=false

And this http://www.os2museum.com/wp/?p=1769

Enjoy.
 
Last edited:

marcoguy

Experienced Member
Joined
Feb 12, 2012
Messages
485
Location
Boston
If you inspect the HTML source of the DOS 4.0M emulation page on that site, you'll get nearly all the information you need to download the files. ;)
 
Last edited:

Chromedome45

Veteran Member
Joined
Jul 6, 2009
Messages
3,828
Location
Central Florida
I see that in the XML this: /disks/pc/dos/microsoft/4.0M/MSDOS400M-DISK1.json" data-value="">MS-DOS 4.0M (Disk 1)</option>
"/disks/pc/dos/microsoft/4.0M/MSDOS400M-DISK2.json" data-value="">MS-DOS 4.0M (Disk 2)</option>

But I am dumb when it comes to xml. So where is the link? If anyone knows how to get the images send me a PM
And then converting a .json back to an image?
 
Last edited:

Tor

Veteran Member
Joined
Mar 14, 2011
Messages
984
Location
Norway/Japan
The link would be the domain plus the path in the file, so http://<the-site>/disks/pc/ and so on.

-Tor
 

Tor

Veteran Member
Joined
Mar 14, 2011
Messages
984
Location
Norway/Japan
Will do, but tomorrow- I'm not at my computer (mobile device).
What I got downloaded were .json files. I only did a quick test (earlier today).

-Tor
 

marcoguy

Experienced Member
Joined
Feb 12, 2012
Messages
485
Location
Boston
Luckily, the author gave the IMG files the exact same name (except the extension) and location, so all you have to do is change these links:
jsmachines.net/disks/pc/dos/microsoft/4.0M/MSDOS400M-DISK1.json
jsmachines.net/disks/pc/dos/microsoft/4.0M/MSDOS400M-DISK2.json
to:
jsmachines.net/disks/pc/dos/microsoft/4.0M/MSDOS400M-DISK1.img
jsmachines.net/disks/pc/dos/microsoft/4.0M/MSDOS400M-DISK2.img
 
Top