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9 votes
2 answers
1k views

How to determine BIOS-provided (INT 13h) hard disk geometry, and how to fix the MBR partition table to agree with it?

7 votes
4 answers
465 views

Booting from SD card on a Compaq LTE 4/75 – DOS 6 works, Windows 95 doesn't

5 votes
2 answers
521 views

Dartmouth BASIC array dimensions question

12 votes
1 answer
701 views

In MS-DOS, how much stack do I need to make an int21 call?

7 votes
2 answers
822 views

Compaq Contura Aero 4/33C - moving data to CF/IDE disk - No operating system detected

39 votes
5 answers
5k views

What's the origin of process return status 0 meaning success?

3 votes
3 answers
626 views

Z80: asymmetric use of B in DJNZ (B is a low byte) vs. BC in LDIR (where B is a high byte)

16 votes
1 answer
863 views

Can we express the instructions to the Analytical Engine in terms of assembler or machine code?

5 votes
2 answers
250 views

When were Player/Missile graphics in Atari computers first documented?

11 votes
1 answer
1k views

What was Burst Mode on the 68030 and why didn't the A2630 support it?

7 votes
2 answers
1k views

Asking explanation of 65C02 assembler code

5 votes
1 answer
793 views

When were other inexpensive computers able to recreate "The Amiga Juggler"?

24 votes
4 answers
7k views

Why was IBM BASIC so Huge?

18 votes
3 answers
2k views

IBM PC Alt + numpad for entering character codes: firmware, BIOS or OS?

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