apple ][ Game Port Interface Board Utility v1.0
  • This program works with any simple device connected to the apple 16-pin game port socket.
    • game paddles
    • joy stick
    • game port interface board
  • It runs on all flavors of apple from ][ on up to IIgs; although, not tested on //c nor clones.
  • It reads INPUT values from:
    • PDL(0) ... PDL(3)
    • the puhbuttons {0...2}, and pushbutton 3 on the IIgs
  • It writes OUTPUT values to:
    • the four annunciator outputs
  • It was specifically written to work with the game port interface board, referencing its configuration of
    • 4 annunciator LED - one per annunciator output
    • 16 bar graph LED - 4 bits gives you 16 states
    • input relay coils - one for each pushbutton
    • output relay contacts 4x {Normally Closed Contact, Normally Open Contact}
    • thermistor - temperature sensor
    • photo resistor - ambient light detector
  • The utility disk includes the source code and a text file that lists PDL(3) vs Temperature values in °F & °C
    • again, specific to the game port interface board.
 

You can download the utility from the kfest website, or, from here:


Game Port Interface Board - kFest 2016 edition
This is the Game Port Interface Board that we demoed in 2014 and made available in 2016 at Kansas Fest as a special kFest edition. If there's demand, we'll build a few more, updated ones, that handle the shift-key mod better and have a more linear slider to PDL byte relationship. If you have an interest in purchasing one, you can email us at the address listed at the bottom of the FAQ. Please be patient with any delay in our reply.
 
They run about $200 because there's a lot of parts and pieces, we build them in batches of 10 (small quantities), each is assembled by hand. Yes, we're trying to find ways to bring the cost down - larger batches & a single PCB configuration rather than two PCBs. Here's a little more info about the boards:
  • Game Port Interface Board FAQs July 2016
 
Here's a link to a video by David Schmenk https://youtu.be/JbRQQ1itQrM using his GPIB with PLASMA.

Game Port Interface Board - kFest 2017 edition
This is our kFest 2017 edition Game Port Interface Board -- half the size & half the cost. We've retained the PDL(2) thermistor and the PDL(3) CdS cell, but, diched the sliders in order to make the board a lot less expensive; same IDC connector pin-outs (so both the 2016 & 2017 editions are compatible with our new-fangled 120vAC control box); and, shift-key mod friendly. If you have an interest in purchasing one, you can stop by and see us at the vendor fair [or any time, really]. We'll have a few on hand, and, we'll take orders for additional boards.
 
They run about $100 because there's still lots of parts and pieces, we build them in batches of about 10 (small quantities), and each is assembled by hand. Yes, we're still trying to find ways to bring the cost down further.