'''BOS''' (''Banked Operating System'') used on [[Vortex Expansions RAM card|expansions RAM]] card from [[Vortex]].
== Versions ==
There are 3 versions:
There are 3 versions :=== BOS 1.0 ===Initial release
==== BOS 1.0 ======== BOS 2.0 ====
Changes:
* Enable resizing of the first memory bank from 32 Kb to up to 64 Kb to prevent issues with large BASIC programs
* Cannot load files larger than 32 Kb from ramdisk in BASIC
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==== BOS 2.1 ====Bugfix release.
Changes:
* Fix bug loading files larger than 32 Kb from ramdisk in BASIC