This section is about Second Processors, although the ones in Cheese Wedge cases are in the Cheese Wedge section. Also here are some sets about using Second Processors:

Torch Z80 Currently unused	ARM7 Co-Processor In Station 1	65C102 Co-Processor In Station 200	65C102 Co-Processor In my Domesday Machine
ARM7 External Co-Processor Currently unused	Watford Co-Pro Adapter Currently unused	65C102 Co Processor In Station 114	PiTubeDirect In use in Stations 114 and 201
RISC PC Turbo 6502	KL Pi Tube Adapters	Tesco Cheese Biscuits Wedge October 2020	PiTube Gecko
Tesco Cheese Biscuits Wedge PSU Re-Cap	Tube Host ROMs	Second Processor Run ROM	Panos
Torch Communicator	Type 0 Tube Transfers	PanOS CALL Broken