Brian, thanks for the input.

As Dave has already mentioned, the 6 pins were for the SSD card shown in his link.

I gather that using I2C type memory chips I could use the same CLK and DTA lines that hook up to the DS1307 RTC chip, and just give the memory chip a different address, so that would save me a couple of pins?

Given that all I really want to store is date, time, temp1, temp2, temp3, temp4 probably every two minutes what would be the ideal memory chip to get to hold a minimum of 7 days worth of data (if longer so much the better). I was also thinking of a rolling data process, so that when full it would simply delete the oldest data to make space for the most current set, ie so it retails the past 7 days (or what every it amount to) worth. Any suggestions of code to do this would be welcome.