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.
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.