What's the rarest or most unusual computer-related item do you own?

[jos]

On 12.01.2017 20:49, Rick Bensene wrote:
> - A large format (4'x5') Summagraphics digitizing tablet with GPIB interface
>
> - A Tektronix 4052 desktop computer (bit-slice implementation of Motorola 6800 CPU) with very rare RAM Disk module installed under keyboard
>


Is this RAM disk module documented ?
Sounds like a possible solution for my 4052, such that I would not have to resurrect those  DC300 cartridges from the dead.

Jos