ATARI ST nMachineType = 0
TOS 1.0 - ROM TOS
The original ROM TOS, this version shipped in 520ST and 1040ST machines.

TOS 1.04 or Rainbow TOS
The latest version of TOS available for 520/1040/MEGA owners.
It has been available as a dealer upgrade for awhile now. It has much more robust Disk I/O, Autorunning of GEM programs at boot up, a fix for the 40 folder limit, and much more. Most of all is it much faster than previous versions of the Operating System

ATARI STE nMachineType = 1
TOS 1.06 - STE TOS, Revision 1
Shipped with the 1040STE and 520STE machines. 
It is essentially TOS 1.04 with support for the new hardware of the STE
TOS 1.62 - STE TOS, Revision 2
This is a slightly revised revision of TOS 1.6. It fixes the POOLFIX problem in GEMDOS and the problem in the Desktop that was present in TOS 1.06.
TOS 2.06 was the last version of TOS available for the ST/STE and provides much needed upgrades to the desktop.

ATARI TT nMachineType = 2
TOS 3.05 - TT TOS
TOS 3.05 is the latest version of TOS currently shipping in the TT030.

FALCON nMachineType = 3
TOS 4.04 : Falcon 030
TOS 4.92 : pre-release, not installed to any machine
