Re: Advanced &

["Michael J. Mahon" <mjmahon@aol.com>]

Lyrical Nanoha wrote:
> ATM, I am unable to find much info on using the ampersand vector, I'm 
> trying to figure out how to do stuff like &STORE "FOO",8192,8191, mainly 
> I'm working on some RDOS-like routines for kicks, but instead of, like 
> PDOS, working with ProDOS - working using the standard DOS 3.3 
> methodology.  I'm going to be loading DOS 3.3 onto the language card.
>
> Can anyone provide any info on this? *_*;

I have a pretty general call-like ampersand handler as part of NadaNet.
It is table-driven, and provides for a value to be returned to a
variable supplied as a parameter.  It might be useful to study.

The basic ampersand functionality is pretty trivial:  When "&" is
encountered, the routine pointed at by the ampersand vector is
called.

The tricky part is understanding enough about the Applesoft
interpreter to parse parameters, evaluate expressions, and
return values.  I found Call-A.P.P.L.E.'s "All About Applesoft"
quite useful, but also referred frequently to a commented
disassembly of Applesoft produced by Sourcerer (part of the
Merlin 8 package).

-michael

Music synthesis for 8-bit Apple II's!
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