!!!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
%%prettify 
{{{
PRINT PEEK(65528) 
}}}
/%
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? see [Rarity 10])

!!For ATARI XL and XE Computers
If you have an XL or XE Computer, type 

%%prettify 
{{{
PRINT PEEK(65527)
}}}
/%
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]