All rights reserved.
This code is derived from software contributed to Berkeley by
the Systems Programming Group of the University of Utah Computer
Science Department.
%sccs.include.redist.man%
@(#)gb.4 5.1 (Berkeley) 06/29/90
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 structure, 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 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 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.
/dev/crt98700 HP-UX starbase special file
15 [ENODEV] no such device.
15 [EBUSY] Another process has the device open.
15 [EINVAL] Invalid ioctl specification.
HP-UX CE.utilities/Crtadjust programs must be used.