This directory contain the DOS versions of MOPAC and GO32. What follows is the original e-mail by Ivar Koppel on the subject. Any problems please contact Ivar, I'm helping him in the distribution but I had no part in the development of this software. Files in the directory are: MOPAC.EXE.Z & GO32.EXE.Z are the compressed versions of the files. MOPACDOS.ZIP is the pkzipped version (include _both_ files). _________________________________________________________________ Some weeks ago somebody was interested in MOPAC running under DOS. Now I can say that we have ported MOPAC 6.0 under MSDOS. It can handle currently 38+38 atoms and is basicly the same program as for VMS or IBM (currently only time and date functions are missing i.e date is Today and time is 00 sec). In my 33 Mhz 486 with 4 M RAM it runs as fast as under Linux, compleately in RAM. (No swapping required). It was compiled using DJ Delories Gnu CC port to MSDOS (DJGPP) and f2c compiler. The size of .EXE file is ca 1.3 Mb, the only program you need to run MOPAC is a small program called go32.exe from DJGPP GCC package (free). If you are interested, send E-mail to ivar@chem.ut.ee or peeter@chem.ut.ee. Best regards, Ivar. Ivar Koppel -------------------------- This program is public domain MOPAC 6.0 port to MS-DOS. It was ported by Peeter Burk and Ivar Koppel at the University of Tartu, Estonia, and compiled using f2c and gcc ported to MSDOS by DJ Delorie. (GCC is copyright Free Software Foundation, but free). FAQ's: I get the message INPUT FILE MISSING OR EMPTY; what shall I do? a: move the input to the file for005. The program displays something like "MOPAC 6.00 for dos etc." and crashes; a: The program won't write anything to screen while computing, so maybe it's not a crash. On some 386-s, however, its possible that your math CPU (80387) gets too much heat and stops working. We had the same problem on our 386 , while it worked 20 sec without and 2 minutes with external cooling. How can I run the program under Windows background? You must have at least 8 Mb of RAM. Be sure that you turn Dos Prompt settings to Background ON. The files GO32.EXE and MOPAC.EXE should be in the same directory! More questions? Mail ivar@chem.ut.ee Ivar Koppel