Larken LKDOS Cartridges
There are a number of variations of the Larken DOS cartridges.
There were 3 different versions and each version could have a variation with and without switch,
with and without Spectrum ROM as well as variations for use with Larken (L), Oliger (O), Aerco (A) and Ramex (R) disk interfaces.
These are Larken LKDOS carts for use with the Larken disk interface. The Version is "L3", L signifies for use with the Larken interface and 3 is the Larken version.
The cartridge on the left has only the LKDOS and a switch to turn the DOS off and on to use the Larken interface with other operating systems, such as Oliger 'Safe DOS'. The cartridge on the right has LKDOS, the Spectrum ROM mounted over the RAM chip, and an on/off switch.
This is a Larken LKDOS cartridge for use with the Oliger disk interface, signified by version "O3".
This has a switch so that the Larken DOS can be turned off if desired by the user.
The cartridge on the left is for use with the Aerco disk interface and is noted as version "A3". The cartridge on the right is for use with the Ramex 'Millenia K' disk interface as shown by the "R3" designation.
These cartridges do not have on/off switches.
Scans and text by Jack Boatwright