Questions tagged [ms-dos]

For questions regarding MS-DOS, the Microsoft Disk Operating System, and its batch scripting language. Do not use this tag for questions about DOS batch languages in general.

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17
votes
4answers
3k views

What are my options for multitasking in MS-DOS 5.0 on an 80186 with EMS?

I've got an HP 200LX, which runs DOS 5.0 from ROM, and I'm using EMM200 to provide some EMS from the C: RAM disk (it uses the memory controller to directly map the "disk" blocks into memory, ...
4
votes
2answers
2k views

Can DOS 6.22 recognize more than 504MB when the BIOS only supports CHS?

My CMOS setup correctly recognizes the geometry of the drive, (but does not support LBA). And FDISK in DOS 6.22 only recognizes 504MB. FDISK even shows the size of the primary partition as roughly ...
16
votes
2answers
2k views

How does Windows 9x determine which disk drivers correspond to which BIOS disks/DOS drive letters?

Windows 9x can employ two kinds of disk drivers: native protected-mode drivers and compatibility-mode DOS drivers, and the former are used in preference to the latter whenever possible. When Windows ...
2
votes
2answers
436 views

Parity error under DOS

I'm facing a Parity Error problem on my new 486er DOS Retro PC. Every now and then, a running software crashes with a Parity Error output on screen. This happens for different software so I think the ...
27
votes
9answers
6k views

What other tricks were there to get more data onto floppy disks?

I remember using a utility back in MS-DOS 3.3 days, called MAXI Disk, that somehow magically managed to get 420K on a 360K 5¼″ disk. I assume it managed it by destroying some redundancy like a backup ...
4
votes
1answer
148 views

Use a USB mouse for DOS games

I have a Thinkpad T41 on which I installed Windows 98 SE. I installed an old DOS game, and was wondering if I could get a USB mouse to work with it ? (the PC doesn't have a PS/2 port) At the moment, ...
14
votes
1answer
1k views

What manages Upper Memory Blocks (UMBs) in MS-DOS?

I had always assumed that EMM386.EXE was responsible for managing the Upper Memory Blocks - UMBs - the memory space between 640KiB and 1MiB in real mode x86. For example, on MS-DOS 6.22, help emm386....
18
votes
3answers
4k views

Do you need to allocate memory before you use it in MS-DOS?

In modern operating systems (for example: Windows), you can't access a memory location before you allocate that memory location to your program (or else a segmentation fault will occur). I am ...
21
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3answers
4k views

Did MS-DOS itself ever use blinking text?

I know that it was possible to create blinking text, but did the operating system itself (I mean, in output from functions of command.com and similar executables) ever make use of blink formatting? ...
15
votes
2answers
12k views

Is WinWorldPC legal? [closed]

I'm sure a lot of us have come across WinWorldPC online. With the valuable resources that it has for obsolete systems, is it actually legal? For example, I could download almost any Windows system I ...
8
votes
5answers
477 views

Getting Music Functioning for Raptor: Call of the Shadows (1994)

I can't get the music audio working for the 1994 version of Raptor. Does anyone know how I can remedy this? I'm not sure if this is the correct forum for this question, but here goes. I have an ...
27
votes
5answers
6k views

Why are Windows 95 installation disks not uniquely bound to a single product key?

I was installing the OEM version of Windows 95 on VirtualBox the other day for reminiscence sake, and for some reason I had two different product keys. I tested both of them to see which one mapped to ...
6
votes
2answers
994 views

Can DOS boot to a hard drive other than HDA1?

I would like to experiment with DOS and would like to create a bootable partition on my hard drive (SDA) SATA device. I created a 1G FAT32 formatted partition on my SATA hard drive (SDA) and tried to ...
6
votes
2answers
187 views

How to get Terminate running in DOSEMU on recent machines? [duplicate]

When trying to run http://www.terminate.com/ under http://www.dosemu.org/, I get Runtime Error 200. I know that this is a well known issue with software compiled with Turbo / Borland Pascal and using ...
5
votes
1answer
354 views

SSH for DOS / Win 3.1

Is there an SSH client for DOS 6.22 or Windows 3.1 that supports certificates and could be used to connect to AWS or Azure instances, or any other server for that matter? I have another laptop ...
26
votes
5answers
3k views

What really is a sound card driver in MS-DOS?

To my knowledge, neither MS-DOS nor BIOS offers any kind of API for sound cards. Therefore the concept of a "driver" is absent, as we know it today. Apart from accessories and sample files ...
7
votes
3answers
698 views

64GB compact flash not booting up in DOS

I have purchased a 64GB compact flash UDMA card and am unable to boot up in DOS. The machine I'm running has a Pentium 1.6Ghz process in it just to give you an idea about how "modern" it is compared ...
12
votes
2answers
1k views

What physical size and density floppies are the intermediate-capacity options for the /F switch of the DOS/Windows/OS/2 FORMAT command meant for?

In MS-DOS 5.0 and newer, PC-DOS 5.0 and newer, Windows 9x, Windows NT 3.1-2000, and OS/2 4.x, the FORMAT command (present in some form or another in literally every single version of Q/86-/MS-/PC-DOS, ...
-1
votes
1answer
233 views

How were console games ported to DOS?

Many popular DOS games were ported from video game consoles: Earthworm Jim Mega Man The Lion King The Lost Vikings Turrican 2 Rayman Oscar Zool Video game consoles generally have wildly different ...
8
votes
3answers
328 views

What software used Turbo Vision back in its prime time?

Turbo Vision, Borland’s text-mode widget toolkit, is fairly widely known by those old enough to remember it, and apparently quite influential: it gave rise to a number of ports and reimplementations (...
61
votes
4answers
21k views

Why is Windows using CRLF and Unix just LF when Unix is the older system?

Windows and MS-DOS use for new lines the control characters CR-LF (carriage return, line feed), while unix uses just LF. As far as I know CR-LF made sense for systems controlling an real teletyper, ...
12
votes
4answers
2k views

Was there an autocomplete utility in MS-DOS?

MS-DOS (at least 6.22) had optional features such as DOSKEY to remember the command line history, which is now standard on modern command prompts. However, I'm not aware of an autocomplete feature, ...
20
votes
4answers
11k views

Why was “C:” chosen for the first hard drive partition?

I was reading this answer, as the question came to my mind: why does C: indicate the first hard drive partition? The usage dates back to CP/M (as noted in a comment), was embraced by MS-DOS, and ...
24
votes
11answers
3k views

Why did CP/M and MS-DOS use the BIOS instead of their own drivers to access hardware?

Modern versions of Windows (and other modern operating systems I suppose) have their own drivers to access hardware. But as I have read, in the old days, if CP/M or MS-DOS wanted to access hardware, ...
12
votes
1answer
2k views

Why would a CD-ROM in an MS-DOS 6.22 system not allow file access?

I have an OS/2 Warp CD that I am wanting to use as the installation media on an IBM PC 350 Pentium system. I have already installed MS-DOS 6.22 and the IBMIDECD.SYS driver for the CD-ROM drive on the ...
5
votes
1answer
419 views

Can't boot FAT32 larger than 2GB, unlike FAT16

Why can my PC not boot FAT larger than 2GB (FAT32) in legacy mode, but FAT16 and NTFS work fine? It just gives me a non-system disk error, while booting the same (DOS boot disk) files under FAT16 ...
2
votes
1answer
134 views

Does there exist a MPU-401 to OPL3 TSR for MS-DOS?

There are a few games for MS-DOS with music only through MPU-401, like the platformer Abuse and the RPG Avalon. Is there a TSR available that intercepts MPU-401 port accesses and transforms them into ...
10
votes
3answers
1k views

Disassembling Windows IO.SYS

Under the question How did Windows ME "cripple" DOS?, Ross Ridge's answer showed a section of his disassembly. I would like to know, a) what disassembler was used and b) what adjustment or ...
13
votes
3answers
3k views

Running DOS, Windows 3, and Windows 98 from one FAT32 partition?

I'd like to setup a Windows 98 SE system that boots into the included MS-DOS 7.1 command line, and which can also run Windows 3.11. I've seen various disjointed posts online that suggest this is ...
11
votes
2answers
860 views

What's the difference between the DOS HIMEM.SYS and the Windows 3.x version?

An installation of DOS (e.g. MS-DOS 5.0) will typically include a statement in its CONFIG.SYS such as DEVICE=C:\DOS\HIMEM.SYS. When installing Windows 3.1, it's setup comments (REMs) that line out, ...
12
votes
7answers
4k views

Transfer files to DOS over serial cable from Linux?

I have a modern Linux computer and a 286 computer running DOS. I would like to transfer files from the Linux computer to the DOS computer over a null modem serial cable. I know you can use INTERLINK....
4
votes
3answers
816 views

Allocate 64 KiB in Watcom C 16-bit DOS

I'm trying to allocate a 64 KiB buffer in Watcom C 16-bit DOS. I'm using the "compact" memory model which defines the code segment to be limited to 64 KiB and addressed by near pointers (...
1
vote
1answer
230 views

How to remove Virus:DOS/V_Sign from a DOS 6.22 system

Fresh install of dos 6.22, unfortunately there appears to be a virus in MBR, each time I get Virus:DOS/V_Sign when re-using floppy from this machine. I can't connect HDD to modern PC, any idea how I ...
10
votes
1answer
642 views

Difference between INT 0x20 and INT 0x21 (0x4C)?

Checking the MS-DOS interrupt list we see INT 0x20 "Terminate the program" (see https://en.wikipedia.org/wiki/DOS_API) but if we check the same page we see INT 0x21 with function 0x4C will &...
5
votes
2answers
565 views

Is there any virtual hard disk driver over serial port?

NOTE: I'm not looking for a way to transfer files from Linux to DOS over Serial cable Is there any MS-DOS driver to enable a new hard-disk drive (let's say D:), using a disk image on another computer ...
4
votes
1answer
242 views

Are there any copies of ICL MS-DOS 4.1 available for emulation?

The first PC I ever owned was the ICL DRS PWS 300 as described in this press release. It was originally supplied with a copy of multitasking MS-DOS 4.1 (and Windows 1.0, which isn't mentioned in the ...
4
votes
3answers
1k views

What was this menu application in DOS?

My father's computer in the early 90s (probably 1991, or at the latest 1992) had a piece of software that acted as an application launcher. I think it was simply called "menu". Its graphics were ...
4
votes
2answers
434 views

How can I malloc() a block that's guaranteed to lie within a single DMA segment in Turbo C 2.01?

I'm following root42's videos about DOS programming using Turbo C 2.01. I've written my own Soundblaster 1.xx driver following the Creative Labs documentation, and I'm confused about memory allocation....
35
votes
10answers
8k views

Is there a reason to prefer earlier versions of MS-DOS over later?

I understand MS-DOS to be backwards-compatible, so is there a reason to run a version earlier than the last (6.22) on an old computer? The only reason I can think of would be for period-accuracy, but ...
13
votes
1answer
1k views

Why are the out-of-bounds areas of Doom distorted on MS-DOS?

Why do the OOB (out-of-bounds) areas of Doom look so unusual? As seen in the image above, the Doom engine not only incorrectly renders the scene, but also renders slices of other scenes that aren't ...
28
votes
3answers
8k views

Were 9.2 file names possible in MS-DOS?

In MS-DOS (and FAT16), you could only have 8.3 file names (like QUESTION.TXT) with only single-case letters and numbers (and a few symbols). The MS-DOS Editor also defaulted to 8.3 - typing edit ...
11
votes
5answers
2k views

Invert LCD screen in DOS 5.0

Would like to run "black on white" software on a DOS machine with an LCD screen, so am wondering if there are any TSR tools, or similar, for inverting the screen. I believe it is grey scale VGA, not ...
20
votes
1answer
2k views

When was QDOS changed to MS-DOS?

So a while back, I heard that MS-DOS was originally named QDOS (Quick and Dirty Operating System), and that it was later changed is MS-DOS (Microsoft Disk Operating System). This was probably a ...
33
votes
3answers
4k views

How did Windows ME “cripple” DOS?

Windows ME includes the ability to create a bootable DOS floppy. This floppy contains versions of COMMAND.COM and IO.SYS that are "crippled" to remove real mode. This is done with only one changed ...
2
votes
1answer
685 views

Looking for a strange DOS database GUI that ran on 286+

I have recently been getting into older apps from when I was a kid; one of these was this strange DOS shipping(?) database GUI that ran on at least a 286, but looked like Windows 3.1; however when you ...
10
votes
3answers
534 views

How can I boot or extract files from an IBM PS/1 with a DoubleSpace-compressed hard drive?

I’m trying to boot an old IBM PS/1, mostly with the intention to read out its hard disk. I realized quickly that the original floppy disk drive was broken, so I replaced it with a Gotek floppy ...
2
votes
2answers
1k views

Why does changing a DOS/Windows EXE cause it to not run? [closed]

If I hex-edit an EXE for DOS or Windows, by adding or removing some text for example, it will no longer run. If I just change a single char around to a different one, it may run. Is this some anti-...
7
votes
5answers
1k views

An old DOS application that allowed to create cards, posters, invitations, etc

I remember an old (90's) program, run in DOS, that allowed its user to create posters, invitations, cards, etc. It had mouse support and its own GUI with windows, bars, fields, etc. The work started ...
3
votes
2answers
600 views

Are .COM executable binaries real mode or protected mode?

Windows and DOS binary executable files with the .EXE extension have an MZ header in them and nowadays also a PE header. But before these there used to also be .COM binary executable files and they ...
9
votes
5answers
1k views

Is there a way to link object files for DOS from Linux?

I'm able to use NASM to assemble simple COM files from my modern Linux computer, but how can I create a DOS EXE file while still in Linux? Specifically, I am interested in a solution that will target ...