Date   : Mon, 10 May 2004 20:47:44 +0100
From   : Sprow <info@...>
Subject: Re: 65c02

In article <Marcel-1.53-0510183044-313xSBG@...>,
   Johan Heuseveldt <johan@...> wrote:

[OSbyte 235]

> > > It should be &FF if speech presence is recognised or 0 otherwise.
> > 
> > Hmmm, I really was expecting this to be 0 and basically it to be a dead
> > chipset, end of story.
> > 
> > But it is &FF.
>
> OK, Speech presence IS detected by the MOS.
> I don't know what is involved here, but recognising is processor only
> I think, but I'm far from sure. 

It just samples the VSPRDY line during startup, and deduces that if it is
high then no speech processor is present. If it is present some more
advanced poking goes on.

> > I suppose the phrase ROM itself could be dead.
>
> The next thing to do then, is to read from the speech PHROM.
>
> Use OSBYTE &9E (157) in a BASIC proggie

Download 'RDPHROM' from my website, much quicker,
Sprow.