Two Torch key disks (with different serial numbers).
You may not have realised it yet, but the Torch OS is keyed to the serial
number of the (uncopyable) Key disk. If you have to re-install the OS, or
if the NiCd goes flat, or... you need the right key disk...
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THose are the second-most-lusing docs I've read, I think. The most lusing
is the XXX service manual (which contains not a single schematic or
useful piece of techincal information. Much of the so-called information
in said manual turns out to be wrong!)
-tony