Ctrl-F9

Will that key combination work if I simulate the key presses inside DOS6.22 with some old dos programs or is that picked up externally?

Try using a reboot sequence (int 19 comes to mind) instead of shutdown. It's not pretty but should work.

Magstriker wrote:

Will that key combination work if I simulate the key presses inside DOS6.22 with some old dos programs or is that picked up externally?

That's for DOSBox itself.

The following ASM #1 and #2 code snippet will shutdown DOSBox within itself.

1;ASM #1
2    jmp far f000:fff0
3
4;ASM #2
5    mov al, 01h
6    out 92h, al

Okay. Thank you for the code. I have compiled this and both methods work. Both methods appear to vary in speed, but I will test on my own to find the best method for me. For those interested in compiling this yourself do the following:

1. Startup any version of DOS or DOS prompt.
2. Run DEBUG (DOSBox does not include this by default. I believe Windows XP has DEBUG but I could be wrong. DEBUG is covered under the default PATH so you can run it from anywhere.)
3. Type the following (It is the memory location you will start writing code to. It is 100 here because .COM files need the offset to be 100 for whatever reason.):

1a 100

4. For ASM1 type only the jmp line, for ASM2 type the mov and out lines in that order. Also with DEBUG all numbers are hex by default so be sure to remove the 'h' letters from ASM2. There is no need for using both methods in the same program. Just make one program for each and try both:

1jmp far f000:fff0
2mov al, 01
3out 92, al

5. The next blank line you get press enter again to drop back to the - prompt and type the following:

1r cx

6. Subtract 100 from the number after the colon on the blank line(This is how many bytes to write out. The number you subtract 100 from ought to be less than 110 for ASM1, 2, or both. Therefore, type:

1Some single digit number, not the words you are reading right now.
2n filename.com
3w
4q

7. You are done! The file will be saved to your current directory. For reference, the n command gives the program a name (do not forget the 8.3 name limits and the file being made is going to be a .COM file), the w command writes our code to a file by that name, and the q command quits DEBUG.

Share and Enjoy! I have attached the compiled .COM files for those not interested in compiling it themselves in all combinations of the above two methods.