I never thought I would ever hear someone bring up a diode matrix again. I cut my teeth on 1A2 just before it became obsolete and we started installing the Tie Econkey TCX 128 systems like crazy. Remember the old silent 700 with the thermal paper?
The journeyman I worked with the most taught me a great way to set up a diode matrix on 66 blocks that was easily customized. Unfortunately I only had a couple instances to use it before it became obsolete. Man, did I think I was hot stuff once I mastered that!! I think that was around 1982-1984 time frame. Oh for the old days when all you had to ask the customer was how many phone do you want to ring.
