CRT monitor for SUN 3/140

I may be telling you what you aready know, in which case I apologise. ECL = Emitter Coupled Logic. It's a type of logic circuitry (in the same way that DTL and TTL are types of logic circuitry). ECL generally uses a -ve supply rail (often -5.2V) and is higher speed that TTL, etc. The high speed feature is probably why it was used for this video signal. At the time, TTL logic was not fast enough, and generally could not drive long cables well at high (for TLT) speeds. ECL could. There were TTL <-> ECL inteface ICs (IIRC 10124 and 10125), bnt of course the speed they could rubn at was limited by the speed on the TTL side. You could probably use a 10125 to convert this video signal to TTL, but whether you could be able see individual pixels clearly I don't know. No, it's a 2-state digital signal. I asusme this is a 1-bit-per-pixel system, like a lot of earleir workstations. I've foudn that runnign computers form the mains helps with this :-) I would be _very_ spuprised if a colour monitor had ECL inputs. On the other hand I have come across an analogue HP colour monitor (that on the HP9836C) where hte inputs are current, rather than voltage, driven. Do you know the model number of this HP moniotr? What is the input connector? Do you know if it works at all? The fact that it won't dispaly enything might be due to a fualt i nthe monitor. -tony