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Torch 68000 board (top)
Torch 68000 board (bottom)
This is a Torch 68000 board with a Motorola M68000-G8 clocked at 8MHz with 256K of memory. Also present on the board is a Zilog Z80B and the CCCP 1.02 ROM. m AMD AM2964 manages the 256K memory and an AMD AM2950 manages the tube interface (I think).
I do not think this was designed as a BBC second processor but was part of a Torch compouter which used the BBC as an I/O processor. But I have no further details.
A HiRes picture of the board is available HERE