[geeks] sbox SBus expansion box?

[alex j avriette]

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2033116397

brian told me the cable for the above box was impossible to find.
however, i see it here:

http://www.auroratech.com/support/partnumbers.html

92-00220-00	6-foot Cable for SBox	

this seems like a neat toy. i've googled for it, and found parts and a
couple old sunmanagers posts... what exactly does this box do?