## 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.
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