| ULPT(4) | Device Drivers Manual | ULPT(4) | 
ulpt —
ulpt* at uhub?
ulpt driver provides support for Universal Serial
  Bus (USB) printers that follow either the USB printer uni-directional or
  bi-directional protocol.
Additional bits OR-ed in the minor device number with the unit number select various features of the driver:
| Minor Bit | Function | 
| 0x40 | Do not initialize (reset) the device on the port. | 
Some printers cannot handle the reset on open; in case of problems try the ulpn device.
USB Device Class Definition for Printing Devices, USB Implementors Forum, http://www.usb.org/developers/devclass_docs/usbprint11.pdf, January 2000.
ulpt driver appeared in NetBSD
  1.4.
| May 16, 2009 | NetBSD 10.0 |