Results 1 to 3 of 3

Thread: Genesis EXT Port is a Controller Port?

  1. #1
    Pear (Level 6) Custom rank graphic
    alec006's Avatar
    Join Date
    Jul 2005
    Location
    DFW
    Posts
    1,270
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default Genesis EXT Port is a Controller Port?

    I never noticed this till I started studding the schematics of the model 1 Megadrive/Genesis which is found here: http://emudocs.org/Genesis/mega1.png . It seems the EXT port found on the back of the early systems has the same pinout as the controller ports in the front. All of them connect to the same chip (315-5309 IC5). The only difference is pin 7 (Select) & pin 9 (Start) don't have resistors on their circuits like the controller ports do. Just wondering,would the Genesis see it as maybe a second,third or forth player or something else completely?
    "...leave love bleeding, in my hands, in my hands again..."

  2. #2
    Strawberry (Level 2) Compute's Avatar
    Join Date
    Feb 2009
    Location
    Appleton, WI
    Posts
    463
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts
    PSN
    compute1984

    Default

    I believe the EXT port was for connecting stuff like the mega modem or computer keyboard type stuff. Something like that. It makes sense to me that it might interface the same as the controllers, since the controller port is rather versatile. Look at Zero Tolerance 2player link-up mode. That interfaces through the player 2 controller port on two systems.
    See my latest arcade repair at the Holodeck 2 Arcade Repair Blog: http://holodeck2arcade.blogspot.com

  3. #3
    Arcade Card Compatible Custom rank graphic
    todesengel's Avatar
    Join Date
    Jul 2008
    Location
    River Ridge, LA
    Posts
    1,205
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Default

    The EXT port was for the Mega Modem. Would have been nice to see other things released that could have used it.

Similar Threads

  1. Sega Genesis Controller port issues (or so it seems)
    By Genesaturn in forum Technical and Restoration Society
    Replies: 1
    Last Post: 03-17-2012, 03:43 PM
  2. Atari 5200 2 port, controller port dead
    By rdangela in forum Technical and Restoration Society
    Replies: 0
    Last Post: 06-26-2011, 12:06 AM
  3. Busted Genesis Controller Port
    By Porksta in forum Technical and Restoration Society
    Replies: 2
    Last Post: 05-29-2006, 01:04 PM
  4. Genesis 3 controller port problem
    By AB Positive in forum Technical and Restoration Society
    Replies: 6
    Last Post: 10-05-2003, 08:10 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •