What you need Ed is a two wire serial EEPROM.
Works like a tape recorder. You send it data and it stores
it sequentially. Perfect for data logging. When you read
it back it sends it back sequentially perfect for RS232
transfer to the PC. 8 pin mini dip.

One megabit should be plenty. BCD four bits per number.
256K numbers. Three numbers per data point.
85,333 data points. 20 three number parameters is a data set.
(Parameters =: temp, press, RPM, pulse width, etc., etc., etc..)

4266 complete 20 parameter data sets. At one data set sample per 
10 seconds that is 426 samples. 
Or 71 minutes or 1 hour 11 minutes of data. 
If my arithmetic is correct.   


http://www.atmel.com/atmel/products/prod6.htm

Paul Lamar
 
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