There are two types of chips that are used for the phone, they are basically the same accept that one is a through hole PIC [D.I.L] and the other is a Surface mount type [S.O.I.C].
They are both 12c508 pic devices, the surface mount type is smaller and easier to fit into
the phone.
Click on the link below for more information on the 12c508 pic device, the document is in PDF format so you need acrobat reader to display it.

 Pic 12C508  File size = 532k
 
 

If you can or want to programme your own chips then here is the Hex file in zip format.
 C12 Hex .
If you are new to PIC programming and want to get started then I advise you to buy
an easy programmer and software, I recommend you try quasar electronics and take a look
at their P16PRO40 Programmer and the software that comes with it.
Also you could try  Max King for more programmers. Blank chips can be obtained from
max king, Maplin or R.S.
 

I will soon be able to supply anyone with chips, when I can I will you know via this page.


 
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