Re: Talking of 1-2-3 @Deryk
I only used the term ASCII because I believe that that it was more immediately understandable than "serial" or "asynchronous". I am well aware that there were many terminals that were normally used as asynchronous serial terminals that had form-filling capability. But I would suggest that outside of some proprietary applications that mandated particular terminal types, almost all ASCII terminals were used as asynchronous serial devices, so much so that the terms are almost synonymous. These devices rarely used the form-filling functions, even if they had them.
By the early '80s, which is when Lotus123 came to the fore, terminals were normally IBM 3270 or 5250 compatible, and did indeed use EBCDIC, or serial terminals that nearly all used ASCII, such as Lear Siegler ADM3A, Wyse50/60, DEC VT100, Beehive etc. There were dozens of manufacturers, all of whom gave up as cheap PCs could also be terminals with the correct software.