BBC
Model B+
This is a more detailed view of the B+ PCB. The missing components at top-left are for the Econet interface and the missing parts in the bottom left are the disc interface.
The curious thing here is that there are no sockets for the disc interface components so it would involve a lot of soldering to add a disc upgrade to this machine. I wonder if this is unusual and I wonder how many tape-only machines were built.
The two ROMs installed inside this B+ are Prestel and the combined BASIC/OS 2.00 ROM.