Hi guys
The manual states that the chip no is an 18 pin device and its chip no is HM7643-5 PROM no 659.

Does that help anyone? I assume these chips are very hard to get nowdays?

I have seen on the web a web site called strikes and spares that make a replacement called a miot adaptor.

http://www.strikesandspares.de/rubrik3.htm

I'd like to stay original but this may be an option.
Has anyone given this a go?

Cheers
Wally




Thanks again
Wally