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15 votes
3 answers
2k views

How does the BIOS distinguish Interrupt(08h-12h) from INT instructions, vs. actual exceptions inside the CPU?

14 votes
4 answers
4k views

Why have MS-DOS device drivers if the ROM BIOS provides access to the same devices already?

3 votes
2 answers
403 views

How can I have the user input a string and then do comparisons on it in a batch file in MS-DOS?

10 votes
5 answers
2k views

Early implementations of the `system()` call in a consumer OS

5 votes
1 answer
553 views

Novell and DOS instant messaging

6 votes
1 answer
205 views

XMS function 0Ch "Lock Extended Memory Block"

8 votes
5 answers
2k views

Any tools (that actually work) for viewing PDF files in FreeDOS?

0 votes
1 answer
274 views

Can HIMEM.SYS be disabled in Windows ME’s IO.SYS?

10 votes
2 answers
791 views

How to get sound working in pure DOS with a CMI8330 card?

12 votes
3 answers
2k views

Disassembling Windows IO.SYS

12 votes
2 answers
2k views

Did early versions of DR-DOS preserve more registers than MS-DOS?

0 votes
0 answers
172 views

Identify this spaceship fruit collection game starring a levitating fish

7 votes
1 answer
413 views

Fooling a DOS in game timer

7 votes
2 answers
3k views

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

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