A classic computer build isn't fully classic to me, until there is a panel full with blinkenlights!

So of course, this is a goal for me as well. As LED Driver I just went with the same ones that were used on the original WDR computer, the ULN2003.

To my surprise, fitting two A4 schematic pages worth of LEDs, Drivers and Resistors onto a 100x100mm board (which 28mm is taken up by the Card-Edge Connector) was not that easily - but that didn't stop me of course.

Had to get a bit creative with the way the LEDs are arranged, but I think it works out just fine like that. Basic Letters and Numbers in the top copper layer provide the basic info to quickly see which LED represents which signal from the BUS.