[z-machine] Legal sound volumes

[David Kinder]

Mike Greger wrote:
> The z-spec says sound effects can be played at volumes 1-8 or 255 meaning
> "loudest possible".
> 
> Does that mean 8 and 255 are the same thing?

It's most likely that 8 and 255 will be interpreted in the same way, but 
the specification doesn't really insist on it: from the wording, using 
255 should be at least as loud as 8, but I suppose it could be louder too.

> Also, what happens if some other value is encountered, e.g. volume 93.should
> this generate an error, be converted to a volume between 1 and 8, or
> something else?

Since the specification doesn't say, it is, by definition, unspecified, 
so the interpreter can do what it likes: a warning message or an error 
would not be unreasonable.

David