If someone is interested, I have published the source code and the basic circuitry I have been using. I have also built a virtual console for the virtual pdp-11. Or if you like it more, a simulation of the simulated console for the simulated PDP-11. http://ancientbits.blogspot.com.es/2013/01/blinkenlights-not-so-difficult-a… Jordi Guillaumes i Pons jg at jordi.guillaumes.name HECnet: BITXOV::JGUILLAUMES PS: This mail _could_ end being duplicated... I apologize for it