Repair methods (was Cromemco 3101/Beehive B150 score)

Tony wrote: You can understand it well enough to use for many practical purposes by just knowing a few "rules of thumb"*. A better, but still not necessarily detailed, understanding of the analogue background can help considerably in some of the more tricky situations - especially if you are "stretching"/abusing the "rules". Too detailed a consideration of the background can actually get in the way [the best example I have of this is the realisation that one has much more tolerance in termination than analogue theorists tend to expect - half or double the normal termination resistance does produce reflections ... but they are small enough that digital inputs will ignore them even though they would be a disaster in, say, an audio or RF amplifier]. * eg, "fanout"; "use lots of decoupling - then add some more"; "keep connections short - and be very cautious of long adjacent runs"; "If mixing LSTTL and CMOS don't connect both types of input to the same output"; and so on. Andy