for 'black-compatible cable', because it is compatible with TI's black cable. The BCC works with TI's
GraphLink software; other cable designs require custom third-party software. The BCC is built with
inexpensive, non-critical, readily available parts. I have built both BCC versions, and they work quite
well. The BCC works only with IBM-compatible personal computers, not with the Apple Macintosh.
You should not attempt to build the BCC unless you have some electronics experience. The BCC is
extremely simple, and no users have reported any damage to either the calculator or the PC from a
properly constructed BCC. Still, there is always the risk of damage, particularly if the cable is
incorrectly assembled. Neither Frank nor I accept any responsiblity for any damage that may result.
Almost all of the information for this tip is taken from Frank's excellent web site:
http://www.students.uiuc.edu/~fmhess/bccs/bccsl.html
and is reproduced here with his permission. You can email Frank at fmhess@uiuc.edu
The original BCC
Frank designed two versions of the BCC cable, the 'original' and the 'deluxe'. The original cable works
well, but the deluxe cable draws less current and will probably work better with PCs which do not
implement true RS-232 signal voltage levels. The deluxe cable adds two transistors to the design, and
changes the resistance values. The balance of this section describes the original cable, and the
following section describes the deluxe cable.
5 - 3
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