Posted By
SVS
on 2018-08-24
10:48:49
 |  Re: DEF FN() question
The "BB" stored is the first character after the "=" in the DEF FN statement. It can be a number, an alphabetical letter or even a token.
This was unknown even in the site' Plus/4 Encyclopedia, so that I've inserted the information.
Regarding the use of "x" data, maybe the BASIC engineer was considering to use a specific variable, but then it made the very flexible system we are. Remember that "our" BASIC is a reduced version of MS-BASIC... 
Anybody has other ideas about?
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