Welcome to LQ Charles
I too saw teletypes in use (but never used them) and worked with an IBM that was a series of boxes (some taller than a man), around the room -- one for processor, memory and channel controllers; a string of disk storage boxes with removable disk packs (and a rack of offline disk packs); a communications box ("front end processor") for serial lines; a rack of "terminal controllers" for the screens and the small printers. When I left that job we had a huge 16 MB (yes,
MB) of memory and 60 GB of storage to meet the needs of ~100 concurrent users, made possible by supplementing the memory with a "Solid State Storage Device" (looked like disk storage to the system) for cache. So SSDs are not new!
Best
Charles too