In addition to it being a RS-232 port, the 2x8 header is a parallel port.
Garrett Meiers
 Founder, 
BitHistory.org &
  President, ConsulNIX, LLC
  
www.BitHistory.org
  www.linkedin.com/in/theunixguy
On Tue, Nov 5, 2013 at 12:01 PM, Steven Hirsch <snhirsch at gmail.com> wrote:
  On Tue, 5 Nov 2013, Win Heagy wrote:
  Here is the full pic of the card.
 It's a TI-99 serial I/O board.  Designed to plug into the external
 expansion box.
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