Ultimate 1MB ROM image contains the following modules (last update Dec 10, 2016):

- SpartaDOS X v4.49b (7-10-2016)
- SIDE Loader v1.29
- BIOS v1.25 (or BIOS v1.25 for Rapidus)
- PBI BIOS v1.85
- XL OS BB000001 rev. 3 (1.3)
- Atari OS B (PAL)
- Q-Meg+OS v4.04
- Q-Meg+OS v5 RC1
- Atari BASIC C
- Altirra BASIC v1.52
- Galaxian (cartridge version)
- Frogger (cartridge version)
- Missile Command (XEGS slot #1).

All can be flashed with uFlash v2.00beta.