Questions tagged [dos]

Disc Operating System, started as 16-bit OS for PC-AT/XT x86++ platforms

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Reverse-engineering DOS game's data files

I would like to figure out the data format used by an old DOS game I used to play when I was a kid. That link includes a full download for all the files and it runs fine in DOSBox if you want to try ...
2
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285 views

BasicCompiler: wanted binaries which BC.exe or QB.exe (compiler) generates

I was in charge of analyze and reverse engineering the old unknown EXE for past few month. The binary works on MS-DOS for NEC-PC98 (retro PC), old (20years more ago), nobody knows how it's made. I ...
2
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0answers
89 views

COBOLII-MB 2.xx

I have a really old cobol program that was used to store some data, the company is no loger active and the program had to receive a key every 3 months. What tools I can use to reverse a cobol program? ...
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Where to start analyzing a 16 bit dos program?

I've tried to analyze this small exe online. I've tried with https://onlinedisassembler.com/odaweb/ (link) but it's hard for me to get the first question: Why the tool doesn't try to detect the set ...
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1answer
249 views

IDA/Hexrays: local variable allocation has failed; how to fix this?

I'm reverse engineering an old DOS game that's using the DOS/4GW extender. The game includes some libraries that I already successfully reversed in a different application, so I'm pretty sure that the ...