General notes regarding interface construction
Warning
Any hardware you connect to your Parallel Port is done at your own risk. Neither myself, not the
original author of the interface, accepts any responsibility for any damage that may occur. This
goes doubly if you construct the interface yourself.
Please visit the original webpage for an interface before constructing it - there may be specific warnings
or instructions there.
Pull-up resistors
Not all Parallel Ports are created equal. Some will function fine with any form of pull-up resistors on
the input lines while others will not function without it. In general the newer ECP Parallel Ports function
without the pull-up resistors.
The diagrams are the work of several different authors - and if they included pull-up resistors then it is
included here as well.
All interfaces, except PCAE and IanHarries, should function fine without any of the resistors. NEVER leave
out the diodes!
Pinout for additional fire buttons
There are no universal standard for any additional fire buttons beyond the first button. The diagrams
here use pin 9 of the joystick connector for the second fire button.
What pins you use for fire buttons are up to you. One possibility is to use a DB15 connector for joysticks
and wire the additional fire buttons to pins 10-15.