DOS – Which Version is loaded

 


Sometimes it can be helpful to know which DOS you booted with. With one or two PEEKs from BASIC
you can easily find out. Use this table to determine the DOS version:


PEEK( ) Value DOS Version
Returned

3889 0 SpartaDOS 2.3e
13 DOS 4.0
15 SpartaDOS 1.1
19 Atari DOS 2.5
76 Atari DOS 3.0
78 Atari DOS 3.0
89 SpartaDOS 3.2d
108 MYDOS 4.0
207 OSS OS/A+ 4.00
221 MYDOS 4.50
238 OSS DOS XL 2.3
244 Atari DOS XE

1804 0 OSS DOS XL 2.3
124 Atari DOS 2.0s


Just type PRINT PEEK(3889) [RETURN] at the READY prompt in BASIC, and compare the number printed
on your screen with this chart. Note that Atari DOS 3.0 may return either a value of 76 or 78 at
location 3889. Both Atari DOS 2.OS and OSS DOS XL 2.3 show a value of 238 at location 3889. To
distinguish between the two, check location 1804.