> I know I've asked this before (but haven't had an answer yet :(
> but what's the difference between the 1771, 1791, 1793, 1795, 1797,
> 2793, 2797 and the hard-to-get-hold-of 1772?
> 
Perhaps you should check out:
http://www.beavshouse.demon.co.uk/dial/index2.htm

Not tried them myself, but they seem more than eager to sell many other
rare chips, can't hurt to ask them their price!

C9,
Numbly.

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