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NetBSD 6.1.5 - man page for isv (netbsd section 4)

ISV(4)				   BSD Kernel Interfaces Manual 			   ISV(4)

NAME
     isv -- IDEC Supervision/16 image capture board

SYNOPSIS
     isv0 at isa? port 0x2f0
     isv0 at isa? port 0x2e0
     isv0 at isa? port 0x3f0
     isv0 at isa? port 0x3e0

DESCRIPTION
     isv is a driver for the IDEC Supervision/16, an image capture board that plugs into a 16-bit
     ISA bus.  The IDEC Supervision/16 digitizes an NTSC television signal, storing a 512 x
     480-pixel, 8-bit grayscale image in its 256kB dynamic RAM array every 1/30th of a second.
     The host reads frames from the DRAM using 122881 16-bit I/O reads.  Reading frames from the
     Supervision/16 is quite slow: after the host reads a 16-bit word from the DRAM, the Supervi-
     sion/16 state machine takes approximately 0.5 microseconds to get ready for the next read.
     Theoretically, a frame rate of approximately 10 frames per second is possible.  isv achieves
     a frame rate of approximately 6 frames per second.

SEE ALSO
     Programming the Supervision/16 Image Capture Board, IDEC, circa 1991.

HISTORY
     The isv device first appeared in NetBSD 5.0.

AUTHORS
     The isv driver was written by David Young <dyoung@NetBSD.org>.

BUGS
     Synchronizing with the hardware and reading frames from it is very CPU-intensive.

     isv will not detect the capture board if it is not attached to an active video source.  To
     force NetBSD to detect the capture board at any time, re-scan the ISA bus using, e.g.,
     drvctl -r isa0.

BSD					  April 1, 2008 				      BSD


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