BOS

BOS (Banked Operating System) used on expansions RAM card from Vortex.

There are 3 versions:

BOS 1.0

Initial release

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
• Allow usage of ramdisk from within BASIC (was previously only usable in CP/M)
• Allow user to set sizes of RAM floppy, printer spooler and BASIC RAM area

Bugs:

• Cannot load files larger than 32 Kb from ramdisk in BASIC

BOS 2.1

Bugfix release.

Changes:

• Fix bug loading files larger than 32 Kb from ramdisk in BASIC

• Vortex SP 512 Kb (BOS 1.0) Manual (pdf) (August 1985)
• Vortex BOS 2.0 Manual (pdf) (10.11.1986)
• Vortex RAM Expansions SP64-SP512 (BOS 1.0) User Handbook (pdf) (Oct 1985)

• BOS10.zip - BOS v1.0 (ROM-image)
• BOS10ALT.ZIP - BOS v1.0 (ROM-image Alternative version)
• BOS21.zip - BOS v2.1 (ROM-image)
• BOS21_664.rom - BOS v2.1 for the 664 (ROM-image)