> What DSP are you using and what is the part price?

Both are now obsolete, and the price when they were alive was
around NZ$7. I considered getting in touch with Rochester (???), a
US company that takes the original manufacturer's masks and
makes new chips for you, but the time I think would be better
spent on developing a s/w alternative on a fast micro like PIC
or AVR. As the original parts were designed for DRAM (in those
days when power consuption was not the issue it is now and
micros were a glint in an engineer's eye) an obvious enhancement
is to design for the modern micro-power mega-SRAMs. Although
the circuit I use currently is a DSP/PIC hybrid and works very well, it
would be fairly easy to dispense with the DSP in a new design.
Having PCBs and DSPs to hand makes that unnecessary right now

> Did you have to
> write the DSP code, or is this a hardwired function of the chip?  Do
> you know of any contemporary chips that might be similar?

There is no coding, apart from a a couple of lines to send commands.
The DSP handles the rest. I would luuurve to find a replacement but
AFAICT there is nothing available in a single chip. Everything I've
looked at so far is at the "scruffy" end of the market (eg ISD) and is
good only for speech frequency bandwidth. For anything else the
sound is so treble-less I can't use them

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