Jump to content


Are You Having Trouble Running Atari 7800 under MESS?

No replies to this topic

#1 Trebor OFFLINE  


    River Patroller

  • 3,218 posts

Posted Fri May 4, 2012 9:01 AM

First, make sure you have the correct BIOS. AtariAge currently contains an older/outdated one. Attached is the correct BIOS file.

Attached File  a7800.zip   11.98KB   1489 downloads

It contains two files:

7800.u7 - CRC: 5D13730C
c300558-001a.u7 - CRC: A0E10EDF

The attached BIOS file should remain zipped inside the roms folder that you have installed MESS:


The above is the correct setup (path).

If you are using the command-line version and not utilizing MESSUI, to launch a game the following syntex is correct (inclusive of the quotes):

C:> MESS a7800 -cart "C:\ROMS\Atari 7800\Dig Dug (1987) (Atari).zip"

The above will launch MESS specifying the NTSC Atari 7800 system, loading a cartridge where the path of the ROM is located under 'C:\ROMS\Atari 7800', and the image name is 'Dig Dug (1987) (Atari).zip'.

Of course if your rom is not zipped, just replace as:

C:> MESS a7800 -cart "C:\ROMS\Atari 7800\Dig Dug (1987) (Atari).a78"

And *.bin files will not work. You need *.a78 files.

P.S. If you are 'stuck' at the system info window the first time you launch MESS running the Atari 7800, just press the left and right arrow keys. :)

If you are looking to first tweak some settings, then at the command line type the following:

C:\MESS>mess -cc

It will create a 'mess.ini' file where you have mess installed. Open the mess.ini file in Notepad. There are a slew of options you can configure.

For configurable options while MESS is running, just hit the 'Tab' key. Use the 'arrow' keys along with 'Enter' key to drill deeper, or the 'Esc' key to back out of a menu option.

Pressing 'Esc' with no menu option(s) on the screen will exit the emulator.

Edited by Trebor, Fri May 4, 2012 9:22 AM.

0 user(s) are browsing this forum

0 members, 0 guests, 0 anonymous users