
So, what to do to play Atari 8-bit games such as Fort Apocalypse with Altirra? Play Atari 8-bit games with Altirra on Windows 11, Windows 10 and older Alt+Enter - switch between windowed mode and full screen.You can use the arrow keys to move and the left CTRL to fire. Click on Input in the main menu, select Port 1 and choose Arrow keys -> Joystick (port 1).Choose Autoselect to let Altirra choose the firmware for the selected hardwareĬlick on System, select Disk Drive and click on Accurate Sector Timing To select specific firmware, click on System, select Firmware, select Operating system and choose your firmware.Click on System, select Hardware and select 600XL/800XL.Close the ROM images window by clicking on Ok.Click on the line starting with XL/XE and click on the button with 3 dots, navigate to your ROMs folder (in this example d:\Altirra\roms), select ATARIXL.ROM and click on Open.Click on the line starting with OS-B and click on the button with 3 dots, navigate to your ROMs folder (in this example d:\Altirra\roms), select ATARIOSB.ROM and click on Open.If you use an older version of Altirra, you'll have to manually add the ROM files:.You can set the added rom files as default by selecting them and clicking the Set as default button.Click on System in the main menu, select Firmware and click on Firmware images.You can use Altirra64.exe for 64 bit operating systems.

Start Altirra by double clicking Altirra.exe file in the d:\Altirra folder.Start Altirra and configure Altirra, including controls In this example we'll use the ATARIXL.ROM file primarily.Copy the ROM files from the downloaded zip file to the roms folder, in this example you'll end up with d:\Altirra\roms\*.rom.Download the Atari System Rom files in a zip file.

