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%
@(#)rb.4 5.1 (Berkeley) 06/29/90
The Renaissance can be configured at either the ``internal'' address (frame buffer address 0x200000, control register space address 0x560000) or at an external select code less than 32. At the internal address it will be the ``preferred'' console device (see cons (4)). The hardware installation manual describes the procedure for setting these values.
A user process communicates to the device initially by means of ioctl (2) calls. For the HP-UX ioctl calls supported, refer to HP-UX manuals. The BSD calls supported 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 98720, the number of planes should be 4. The number of colors would therefore be 15, excluding black. If one 98722A frame buffer board is installed, there will still be 4 planes, with the 4 planes on the colormap board becoming overlay planes. With each additional 98722 frame buffer board 4 planes will be added up to a maximum of 32 planes total.
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 structure describing the 98720 is defined in <hpdev/grf_rbreg.h>.
For extensive code examples using the Renaissance, see the X device dependent source.
/dev/crt98720, /dev/ocrt98720 HP-UX starbase special files
/dev/MAKEDEV.hpux script for creating HP-UX special files
15 [ENODEV] no such device.
15 [EBUSY] Another process has the device open.
15 [EINVAL] Invalid ioctl specification.
HP-UX CE.utilities must be used.