Titan File #1, card reader detection and FRAM-71

[cruff]

Thanks to Joe for posting the updated Titan Files, it was fun to read them.

In Titan File #1, there is a comment about how to detect if the card reader is present by issuing a PEEK$("2C014",1) and checking for a non-zero result.
If a FRAM-71 is installed, the PEEK$("2C014",1) may also return non-zero depending on the current contents of the FRAM-71 configuration registers. This may confuse a program looking for card reader presence. Of course, FRAM-71 users are unlikely to be running anything looking to use a card reader anyway. :-)