How to find the OS Version of your computer#

Atari ROM Checker by JAC!#

For ATARI 400 and ATARI 800 Computers#

In Atari BASIC type the following command if you have an 400/800 and press the RETURN key

Value	OS Version	CRC 32	MD5	ROMs
255	First 800 OS NTSC ; please further see Rarity 10	?	?	we are still searching for this. Please help us ;-)
221	400/800 OS Rev. A NTSC	c1b3bb02	a3c1585b5d19719f8acfa2b093bea75f	CO12499A, CO14599A, CO12399B
214	400/800 OS Rev. A PAL	72b3fed4	eb1f32f5d9f382db1bbfb8d7f9cb343a	CO15199, CO15299, CO12399B
243	400/800 OS Rev. B NTSC	0e86d61d	4177f386a3bac989a981d3fe3388cb6c	CO12499B, CO14599B, 12399B
34	400/800 OS Rev. B PAL; please further see Rarity 10	0c913dfc	89d5e5f4713267667ab713449944f8a9 Kr0tki-Version	we are still searching for this. Please help us ;-)

For ATARI XL and XE Computers#

If you have an XL or XE Computer, type and press the RETURN key

Value	Version
10	XL/XE OS Rev 10
11	XL/XE OS Rev 11
1	XL/XE OS Rev 1
2	XL/XE OS Rev 2
3	XL/XE OS Rev 3
59	XL/XE OS Rev 3B (Arabic)
4	XL/XE OS Rev 4

see also How to find the revision number of Atari Basic