Prompt Line Lengths
We start with everyone's favourite input prompt, the BBC BASIC >. Here we can see that six lines of input in mode 7 are allowed before the VDU 7 bleeps begin and further input is disallowed.
The total line length here is 238 characters, although I am not clear why that would be. A line of a BASIC program must be no more than 255 characters so that the line length can be stored in a single byte, but this 238 maximum leaves plenty of space for the BASIC line storage overheads.
