Questions tagged [executables]

For questions about executable binary files.

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Loading a Tandy CoCo or a Dragon 32 machine code program from cassette with multiple “name blocks”

For the Dragon 32 and the TRS-80 Color Computer I've found two documents describing how loading from cassette tape works:Dragon 32 doc, CoCo doc. They both say that a standard program consists of a ...
9
votes
1answer
361 views

Why do PC DOS kernel files have the COM extension, even though they are not executable as COM files?

The PC DOS kernel is stored in files named IBMBIO.COM and IBMDOS.COM. Although they have the COM extension like executable files, neither of these files could actually be run from the command line, ...
16
votes
1answer
3k views

How did large .COM files work?

An MS-DOS .com file is just raw code/data without header, thus no linking information, and was limited to be loaded into just one segment (64kB). That's the reason corrupted binaries would print "...
2
votes
2answers
272 views

Are old Dos and Windows .com executable binaries real mode or protected mode?

Newer Windows and Dos binary executable files with the .exe extension have an MZ header in them and nowadays also a PE header. But before these there used to also be .com binary executable files and ...
3
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2answers
514 views

What file formats were used for binary executable files on later Sinclair ZX Spectrums?

The last official version of the Sinclair ZX Spectrum was the +3, released after the company was owned by Amstrad. It included a 3-inch floppy disk drive as used on other Amstrad computers. But even ...
16
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5answers
2k views

What tools were used in late MS-DOS era for reverse engineering and patching binary executables?

In the late MS-DOS era, what were the state of the art software tools for reverse engineering and patching binaries, i.e. .exe and .com files? A simple list of the tools that were "state of the art", ...