The ARM7 coprocessor can be used with the BBC Micro as an external coprossor aor as an internal coprocessor for the Master. It has a 64MHz ARM7 with 16MB memory and runs BASIC V.
I decided to upgrade a Master 128 to the ultimate specification so I couldn't resist buying an ARM7 coprocessor, the fastest co-processor for the BBC and Master.
Full details of and how to buy the ARM7 Coprocessor are on Sprow's web pages .
Sprow ARM7 Coprocessor (top)
Sprow ARM7 Coprocessor (bottom)
The board comes with the following features:
Here is the ARM7 Coprocessor User Guide , kindly supplied by Sprow.