Re: 251715-01 - CAS0...CAS3 signals

From: Spiro Trikaliotis <*ml-cbmhackers_at_trikaliotis.net*> Date: Thu, 8 Dec 2011 17:56:26 +0100 Message-ID: <20111208165626.GD340@trikaliotis.net> · ml-cbmhackers_at_trikaliotis.net

* On Thu, Dec 08, 2011 at 05:20:33PM +0100 Konrad B wrote:

>    As we are trying to resolve some C= IC's mysteries recently, here is
>    another one: 251715-01 gate array from the C64 has some unused pins -
>    !CAS0...!CAS3.
[...]
>    Any idea what those extra CAS (???) signals were supposed to do ? ;)

Out of the blue: Extra memory?

By using different CAS signals, you can perfectly add additional RAM
banks. So, I would think this might be the intended usage of these
signals.

How they are selected is another thing, however.

Regards,
Spiro.

-- 
Spiro R. Trikaliotis                              http://opencbm.sf.net/
http://www.trikaliotis.net/                      http://vice-emu.sf.net/

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