Reproducing old machines with newer technology (Re: PDP-12 at the RICM)

Absolutely. When DEC introduced the Remote Diagnostic Console for the 11/70, they started deploying those internally. That makes sense. But in the RSTS/E development group, we put our foot down and told them ?take it out and give back our blinkenlights? because for OS development the ability to judge what the machine is doing, or spot strange behavior, from the light patterns is quite important. I can see several reasons for the disappearance of console lights. Cost, of course. The fact that it wasn?t important for people running turnkey applications, i.e., much of the customer base. And the switch from assembly language to higher level languages. Then there was the very occasional early machine with no lights at all ? the CDC 6000 series is the one I can think of. But there you had the real time console status display, which was even better ? updated just as fast but with a whole lot more information. paul