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97 votes
1 answer
28k views

Why did MS-DOS applications built using Turbo Pascal fail to start with a division by zero error on faster systems?

78 votes
9 answers
14k views

Why were CLIs typically light text on dark background, whereas GUIs typically use(d) dark text on light background?

37 votes
4 answers
5k views

Why did so many early microcomputers use the MOS 6502 and variants?

29 votes
2 answers
4k views

How did MS-DOS assign drive letters in the case of more than two floppy disk drives?

28 votes
2 answers
3k views

Why did connecting the IBM PC 3.5" FDD backwards cause the problems it did?

18 votes
3 answers
3k views

How to switch an 80286 from protected to real mode?

16 votes
3 answers
2k views

How did the IBM PC handle multiple physical devices serving memory at the same physical address?

15 votes
4 answers
2k views

Did the Intel 8086/8088 not guarantee the value of SS:SP immediately after RESET?

11 votes
2 answers
2k views

When specifying Intel 80x86 instruction execution time, what is included in the cycle count?

10 votes
1 answer
550 views

How were Microsoft GW-BASIC "protected" files encoded?

8 votes
1 answer
1k views

Which MS-/PC-DOS version was the first to allow multiple partitions to be used?