Am 20.05.2011 10:12, schrieb Invisible:

>> A COM file is raw machine code without any headers, at least on CP/M. A
>> COM file was executed by reading it into 0x100 and branching to 0x100.
>
> That appears to be the case for MS-DOS as well. (I know gasm has a "COM
> output" option which appears to match this description.)

I'm not exactly sure, but AFAIR the MS-DOS COM files had a small header 
before the actual code. (That one was simply copied into memory as well 
though.)

MS-DOS also didn't place COM files at address 0x100, but rather at a 
fixed offset in an arbitrary segment.

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