(non?)HP Basic

[J. David Bryan]

On 5 Mar 2008 at 17:20, Tim Riker wrote:

> I do recall that the leading "." was a feature our admin (Frank Stover
> as I recall) added to the system by request. 

HP BASICs of the 2114 era restricted filenames to letters and digits, so 
neither the period nor the ampersand in ".D&D" would have been legal 
without local modifications to the interpreter.

I had a quick squint at the contributed library catalog (e.g., "HP 2100 
Program Catalog" at hpmuseum.net), and it seems as though all of the 
contributed BASICs (including MSU BASIC) were modelled on the language of 
the HP 20392 single-user product.  None mention an ON...THEN statement.

With the ON...THEN statement and the different FILES syntax, I'm pretty 
sure that this is either a non-HP BASIC, or it's a contributed library 
BASIC that was locally modified.

                                      -- Dave