📄 com.htm
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<p align="center"><font size="6" color="#0000ff">com format</font></p>
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<td width="100%"><pre>the com files are raw binary executables and are a leftover from the old cp/m
machines with 64k ram. a com program can only have a size of less than one
segment (64k), including code and static data since no fixups for segment
relocation or anything else is included. one method to check for a com file is
to check if the first byte in the file could be a valid jump or call opcode, but
this is a very weak test since a com file is not required to start with a jump
or a call. in principle, a com file is just loaded at offset 100h in the segment
and then executed.</pre>
<pre>offset count type description
0000h 1 byte id=0e9h
id=0ebh
those are not safe ways to determine wether a
file is a com file or not, but most com files
start with a jump.
further information not available.
extension:com
occurences:pc
see also:exe,mz exe,ne exe</pre>
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