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Results tagged with ms-dos
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user 18327
MS-DOS, the Microsoft Disk Operating System, its OEM-branded versions, and x86 DOS clones in general.
24
votes
7
answers
6k
views
Did MS-DOS have any support for multithreading?
Common wisdom seems to be that MS-DOS was an exclusively single-threaded OS. Of course, implementing a scheduler would be possible, but the OS itself did not provide any facilities for multithreading, …
- 973
11
votes
1
answer
604
views
How can I properly execute and clean up after a DOS MZ executable loaded into memory with in...
Ralf Brown's Interrupt List describes a subvariant of the DOS int21/4Bh function with AL=01, where the program is loaded into memory and a PSP + stack are allocated for it, but the program is not exec …
- 973
7
votes
1
answer
686
views
What is the format of the static libraries shipping with legacy Microsoft C for DOS?
I have installed Microsoft C 5.10 on DOS 6.22. It created a 'LIB' directory with static libraries to link against. Now I need to extract the symbols and the code for the functions from them, but can't …
- 973
3
votes
How can I make the Microsoft C compiler for DOS emit a loop with an intermediate jump to con...
TL;DR: It does not appear to be possible with the MS compiler, but I managed to get Borland Turbo C to emit the required code.
Inspired by user JeremyP's suggestion that a different compiler might hav …
- 973
3
votes
2
answers
511
views
Why does my MZ executable's BSS inflate by ~1,5KB after linking fopen() with MSC?
For a game reversing project, I am trying to undo linking with the C library performed by the MSC 5.1 C compiler+linker.
To that end, I have created a simple executable that does nothing except refere …
- 973
4
votes
Why does my MZ executable's BSS inflate by ~1,5KB after linking fopen() with MSC?
Turns out the MSC linker can put BSS data in an executable that is not referenced anywhere.
I inspected the map file generated by the linker and found some public names (__bufin/__bufout/__buferr) aro …
- 973
10
votes
3
answers
1k
views
How can I make the Microsoft C compiler for DOS emit a loop with an intermediate jump to con...
I am trying to recreate the exact C source code from some 16bit DOS 8086 assembly generated by the MS C 5.0 compiler. After making some progress, I've hit a wall with the following code (annotated in …
- 973
14
votes
Accepted
How can I make the Microsoft C compiler for DOS emit a loop with an intermediate jump to con...
It turns out that in MS C 5.1, in addition to all the /O... options there is one seemingly unrelated one that influences the optimizations for this compiler: /Zi. In the output of CL /help it is descr …
- 973
8
votes
1
answer
705
views
How to make Microsoft C for MS-DOS emit an immediate-target far call into the data segment?
I am trying to recreate the C source code from some 16bit DOS 8086 assembly generated by the MS C 5.0 compiler. I've hit a wall with this far call instruction.
0000008D 9A2F0CB506 call 0x6b5:0 …
- 973