Opus
Challenger
Opus
Challenger
There are two main elements to the circuit board inside the Opus Challenger. Firstly, the disc interface, with the 1770 disc controller at it heart.
The second element is the RAM disc. The two rows of chips in the bottom right-hand corner of the board are the RAM chips. The bottom row are an optional 256K taking the total to 512K so you can see that I am very lucky to have a fully-upgraded Opus Challenger board.
The Opus Challenger can run with two drives and there is a connector on the right-hand side of the board for adding a second drive. Accordingly to the instructions, this must have its own power source.
The Challenger plugs into the 1 MHz bus of the Beeb and NOT the disc drive port. On the left-hand side is a 1 MHz Bus out connector to allow the daisy chain system to continue. Apparently there is an on-board terminating resistor which must be removed if the Challenger is not the last device in the chain.
The board says "OPUS BBC 512 Issue 2" so perhaps this model came with the 512K already on board.
