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How to find the OS Version of your computer#

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
221	400/800 OS Rev. A NTSC
214	400/800 OS Rev. A PAL
243	400/800 OS Rev. B NTSC
34	400/800 OS Rev. B PAL (DOES THIS VERSION ACTUALLY EXIST???)

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