Tube	Client.rom Client.src 6502copro.gif	ROM Source code Circuit diagram	External 65c02 second processor.
CoPro	Client.rom Client.src	ROM Source code	Internal 65c102 "Turbo" CoProcessor.
Electron	ETI1985.doc ETI1985.txt E2P.src E2P	(MSWord) 1.9M (Text) 53K  15K Diagrams	"Electron Second Processor", an article by John Wike in Electronics Today International, June/July 1985 describing a 6502 copro for the Acorn Electron. It uses a memory window to communicate between the two processors instead of the Tube ULA, and implements the full Tube API.
PMS-E2P			The ETI Electron Second Processor was developed into the Permanent Memory Systems Electron Second Processor. It is substantially the same hardware and software. It also uses a memory window to communicate between the two processors instead of the Tube ULA, and implements the full Tube API.
CUBE	MOS419.rom MOS419.src EURO414.rom EURO414.src cube65.png	Client ROM Source code Host ROM Source code Circuit diagram	Control Universal EuroCUBE-65 and EuroBeeb 6502 CPU systems. Control Universal took over Acorn's rackmount/Euroboard systems in about 1982. Their EuroBeeb was basically an extendable Eurocard rackmounted Beeb.
65Tube	Code064.rom Code064.src	ROM Source code	65Tube emulator.
Dis65 Mon65 MkSrc65	2K 9K 5K		BBC BASIC 6502 disassembler module, disassembler and source generator.