com.htm

来自「刚刚看到本站有Visual C++数字图象处理（人民邮电出版社）的电子书」· HTM 代码 · 共 40 行

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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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