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GB(4)		      BSD/hp300 Kernel Interfaces Manual		 GB(4)

NAME
     gb — HP98700 ``Gatorbox'' device interface

DESCRIPTION
     This driver is for the HP98700 and 98710 graphics devices, also known as
     the Gatorbox.  The term ``Gator'' will often be used, and it is not to be
     confused with ``Gator'' used in reference to an HP 9837 or 200/237
     machine.  Also, the term Gatorbox is used for the 98700 alone, with the
     98701 frame buffer memory or with the 98710 accelerator installed.	 This
     driver merely checks for the existence of the device and does minimal set
     up, as it is expected the applications will initialize the device to
     their requirements.

     The 98700 can be used as the only graphics device on a system, in which
     case it will be used as the system console.  It can also be installed as
     a secondary display device.  For the first case, the HP 98287A M.A.D.
     interface card should be set to internal control space.  This will put
     the frame buffer at the DIO address 0x200000 and the control registers at
     0x560000.	At this address it will be the ``preferred'' console device
     (see cons(4)).  For use as a secondary device, the 98287A should be set
     to frame buffer address 0x300000, and to an external select code.

     It should be noted that this configuration will conflict with the 98547
     display card which has a 2 megabyte frame buffer starting at address
     0x200000.	The 98700 should only be installed as a secondary device in a
     machine with a 1 bit 98544 display card or 4 bit 98545 card.  The 98700H
     Installation Guide contains further configuration information.

     The ioctl(2) calls supported by the BSD system for the Gatorbox are:

     GRFIOCGINFO
	     Get Graphics Info

	     Get info about device, setting the entries in the grfinfo struc‐
	     ture, as defined in ⟨hpdev/grfioctl.h⟩.  For the standard 98700,
	     the number of planes should be 4.	The number of colors would
	     therefore be 15, excluding black.	With the 98701 option
	     installed there will be another 4 planes for a total of 8, giving
	     255 colors.

     GRFIOCON
	     Graphics On

	     Turn graphics on by enabling CRT output.  The screen will come
	     on, displaying whatever is in the frame buffer, using whatever
	     colormap is in place.

     GRFIOCOFF
	     Graphics Off

	     Turn graphics off by disabling output to the CRT.	The frame buf‐
	     fer contents are not affected.

     GRFIOCMAP
	     Map Device to user space

	     Map in control registers and framebuffer space. Once the device
	     file is mapped, the frame buffer structure is accessible.	The
	     frame buffer structure describing the 98700 is given in
	     ⟨hpdev/grf_gbreg.h⟩.

     GRFIOCUNMAP
	     Unmap Device

	     Unmap control registers and framebuffer space.

	     For further information about the use of ioctl see the man page.

EXAMPLE
     A small example of opening, mapping and using the device is given below.
     For more examples of the details on the behavior of the device, see the
     device dependent source files for the X Window System, in the
     /usr/src/new/X/libhp.fb directory.

	   struct gboxfb *gbox;
	   u_char *Addr, frame_buffer;
	   struct grfinfo gi;
	   int disp_fd;

	   disp_fd = open("/dev/grf0",1);

	   if (ioctl (disp_fd, GRFIOCGINFO, &gi) < 0) return -1;

	   (void) ioctl (disp_fd, GRFIOCON, 0);

	   Addr = (u_char *) 0;
	   if (ioctl (disp_fd, GRFIOCMAP, &Addr) < 0) {
	   (void) ioctl (disp_fd, GRFIOCOFF, 0);
	   return -1;
	   }
	   gbox = (gboxfb *) Addr;			   /* Control Registers	  */
	   frame_buffer = (u_char *) Addr + gi.gd_regsize; /* Frame buffer memory */

FILES
     /dev/grf?	    BSD special file
     /dev/crt98700  HP-UX starbase special file

DIAGNOSTICS
     None under BSD.  HP-UX The CE.utilities/Crtadjust programs must be used.

ERRORS
     [ENODEV]  no such device.

     [EBUSY]   Another process has the device open.

     [EINVAL]  Invalid ioctl specification.

SEE ALSO
     ioctl(2), grf(4)

BSD				 June 9, 1993				   BSD
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