Adam,
Have you been able to find a solution yet? You should be able to use a 8-bit RTC in this area. You will likely need to hook address line A0 of the device to A1 of the Card Engine/Processor, and so on.
When doing this, you'll need to watch your software as your addressing will be a bit different because you no longer have A0, but instead are starting with A1.
So, instead, your addressing would map this way:
Device -> Software Address
0x00 -> 0x00
0x01 -> 0x02
0x02 -> 0x04
0x03 -> 0x06
... and so on
Thanks,
-Mike A.
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