With the addition of a Microchip PIC 24F microcontroller, communications ports, and a plethora of input, output, monitoring, and status signals, the Xitron HP PCA card is a logical choice for OEMs to integrate their own printing solutions around the HP “Bar in a Box” offering.
Please see the PDF attached for the documentation.
See also here: https://www.xitron.com/xitron-pca-interface-for-hp and here: https://www.xitron.com/navigator-dfe-for-hp