Parallel Port Raspberry Pi Hat

This hat adds a DB25F Parallel Port to your Raspberry Pi.  This is useful for hobby grade CNC routers or mills to use the Raspberry Pi as the main controller.  The 5 axis CNC Breakout board is really inexpensive and available everywhere, and this hat is the simplest way to connect it to the Pi.  Note that full Parallel Port pin control is not included on this board.  It is designed to be used specifically with the 5 axis CNC Breakout board also sold on this site.  A parallel port will not be added to the Pi.  LinuxCNC will toggle the GPIO pins to drive the BOB board. Please use the sample HAL files for implementation.  If you need a full parallel port control for a different purpose, please contact us. Features Adds a DB25F Parallel Port to the Raspberry Pi When used with 5 Axis Breakout Board:  Stepper motor outputs to external drivers for axis X, Y, Z, A, and B (B axis DIR signal is shared with Relay Output, so only one can be used at a time) 0-10V analog (PWM) output to VFD 5 inpu