Bill, the ITT 601 did have IC capability. As previously discussed, it warn't cheap. And if I recall correctly, you had to add a DTMF decoder card to make it work with touch-tone. And if you didn't protect both the CO lines and the AC power, the IC card would save the rest of the cabinet by dying first. I believe it went in the bottom slot. Some of the 601's came with a board layout glued inside the cover. Maybe you're 1 of the lucky ones. And if you peek all around the card slots, I believe they were marked in some way also. Been too long, sorry. John C. (Not Garand)
