Thanks for the help, I managed to make the green and yellow LEDs blink, as well as the two red LEDs controlled by port B on bits 2 and 3. What I mainly need to be sure of now though, is how to correctly attach external I/O devices to the parallel ports, and how they are controlled.
Dynamic C, the IDE used to control the processor, has separate functions for reading from / writing to internal and external IO devices on each parallel port, so I assume that each of the parallel port bit sockets on the prototyping board corresponds to an IO device, while the internal devices are separate and handled by other parts of the board invisibly (or at least, in a way that I can't see)... am I on the right track?
So for example, I should be able to connect my own LED to PE5 on the prototyping board, and turn that on with the external IO write function for port E bit 5, or activate the LED you pointed out in the same bit / port location internally to the board. Is that correct?