ik man page on Ultrix

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ik(4)				  Unsupported				 ik(4)

       ik - Ikonas frame buffer, graphics device interface

       device ik0 at uba? csr 0172460 vector ikintr

       The  program  provides  an interface to an Ikonas frame buffer graphics
       device.	Each minor device is a different frame buffer interface board.
       When  the device is opened, its interface registers are mapped, by vir‐
       tual memory, into the user processes address space.   This  allows  the
       user  process  very  high  bandwidth to the frame buffer with no system
       call overhead.

       Bytes written or read from the device are DMA'd from or to  the	inter‐
       face.   The  frame buffer XY address, its addressing mode, etc. must be
       set up by the user process before calling write or read.

       Other communication with the driver is by ioctls.  The IK_GETADDR ioctl
       returns	the virtual address where the user process can find the inter‐
       face registers.	The IK_WAITINT ioctl suspends the user	process	 until
       the  ikonas  device  has	 interrupted  (for  whatever reason — the user
       process has to set the interrupt enables).

       An invalid access (for example, longword) to a mapped interface	regis‐
       ter can cause the system to crash with a machine check.

				      VAX				 ik(4)

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