AT6xxx Operating System Compatibility

AT6n00:

Serial numbers 920410xxxxx through 950131xxxxx...
Are all 12 MHz boards and only operating system (.ops) revisions 2.2 (2/7/94) and lower will work.

Serial numbers 950201xxxxx and later...
Are all 16 MHz boards. These require operating system (.ops) revisions 2.3 (2/1/95) and higher.

AT6n50:

Serial numbers 960329xxxxxx and older...
Are all 12 MHz boards. These require operating system (.ops) revisions 3.6 and lower.

Serial numbers 960329xxxxx and later...
Are all 16 MHz boards. These require operating system (.ops) revisions 4.1 (3/13/96) and higher.

Serial numbers 990506xxxxx and later...
Require operating system (.ops) revisions 4.72 and later.

Serial numbers 000216xxxxx and newer...
Require operating system (.ops) revisions 4.8 and later.