USB type-B connectors are the big ugly square ones. Easy to find cables for, but they sure ain't very pretty. So they still have value. Get them here at Solarbotics!
The DS75176 is equivalent to the SN75176
Begone, hard-to-program USB devices! At the hands of my FT232RL chip, you will behave like a serial comm port!
he ST232 is a 2 driver, 2 receiver device following EIA/TIA-232 and V.28 communication standard.
The DTE RS-232 module is a tight and tidy way to convert RS-232 (computer-level) signals down to a microcontroller level signal strengths. DCE means it's configured as a "Data Communications Equipment" (with 9 holes).