MJK2660@RITVM.BITNET (Mike Koziol) (11/01/87)
This past year we had an AT&T system 85 switch installed on campus and an AT&T model 7405 (with display panel) telephone was installed in my office. I was told at the outside that the phone was capable of many options, and to never unplug it as it may not work when I plugged it in again. Since I'm basically a curious sort a friend and my self recently disassembled it and found two rather large circuit boards populated nicely with lots of chips and a couple of EPROMS. I have a few questions: what "processing" does this phone do, what is stored in memory, how volatile is the memory, what is the phone capable of, and finally why shouldn't I unplug it? Any ideas?