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<p align="center"><font size="6" color="#0000ff">dos exe file structure</font></p>
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<td width="100%">offset size description<br>
<br>
00 word "mz" - link file .exe signature (mark zbikowski?)<br>
02 word length of image mod 512<br>
04 word size of file in 512 byte pages<br>
06 word number of relocation items following header<br>
08 word size of header in 16 byte paragraphs, used to locate<br>
the beginning of the load module<br>
0a word min # of paragraphs needed to run program<br>
0c word max # of paragraphs the program would like<br>
0e word offset in load module of stack segment (in paras)<br>
10 word initial sp value to be loaded<br>
12 word negative checksum of pgm used while by exec loads pgm<br>
14 word program entry point, (initial ip value)<br>
16 word offset in load module of the code segment (in paras)<br>
18 word offset in .exe file of first relocation item<br>
1a word overlay number (0 for root program)<br>
<br>
- relocation table and the program load module follow the header<br>
- relocation entries are 32 bit values representing the offset<br>
into the load module needing patched<br>
- once the relocatable item is found, the cs register is added to<br>
the value found at the calculated offset<br>
<br>
registers at load time of the exe file are as follows:<br>
<br>
ax: contains number of characters in command tail, or 0<br>
bx:cx 32 bit value indicating the load module memory size<br>
dx zero<br>
ss:sp set to stack segment if defined else, ss = cs and<br>
sp=ffffh or top of memory.<br>
ds set to segment address of exe header<br>
es set to segment address of exe header<br>
cs:ip far address of program entry point, (label on "end"<br>
statement of program)</td>
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