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

     tc — HP98544 98550 ``Topcat'' and ``Catseye'' device interface

     This driver is for the HP98544, 98545 and 98547 ``Topcat'' and HP98548,
     98549, and 98550 ``Catseye'' display cards.  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 require‐
     ments.  The Topcat and Catseye are nearly identical in common usage and
     only the Topcat will be referred to from now on.

     The Topcat display cards are not user configurable.  If one is present on
     a system, it will always have a frame buffer address of 0x200000 and a
     control register address of 0x560000.  These are the HP series 300 ITE
     (Internal Terminal Emulator) defaults.  The device can also be used as a
     graphics output device.

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

     GRFIOCGINFO  Get Graphics Info

		  Get info about device, setting the entries in the grfinfo
		  structure, as defined in ⟨hpdev/grfioctl.h⟩.	For the 98544
		  or 98549, the number of planes should be 1, as they are
		  monochrome devices.  The number of planes for a 98545 is 4,
		  translating to 15 colors, excluding black.  The 98547 and
		  98548 cards have 6 planes, yielding 63 colors and black.
		  The 98550 has 8 planes, yielding 255 colors and black.  The
		  displayed frame buffer size for the 98549 and 98550 is 2048
		  x 1024, for the others it is 1024 x 768.

     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
		  buffer 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 acces‐
		  sible.  The frame buffer structure describing Topcat/Catseye
		  devices is defined in ⟨hpdev/grf_tcreg.h⟩.

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

     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 directory.

     struct tcboxfb *tc;
     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;
     tc = (tcboxfb *) Addr;			     /* Control Registers   */
     frame_buffer = (u_char *) Addr + gi.gd_regsize; /* Frame buffer memory */

     /dev/grf?		BSD special file
     /dev/crt98550	HP-UX starbase special files
     /dev/MAKEDEV.hpux	script for creating HP-UX special files

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

     [ENODEV]  no such device.

     [EBUSY]   Another process has the device open.

     [EINVAL]  Invalid ioctl specification.

     ioctl(2), grf(4)

BSD				 June 9, 1993				   BSD

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