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 Supervision/16 state machine takes approximately 0.5 microseconds to get ready for the next read. Theoreti-
cally, 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
Check Out this Related Man Page
PIIXPCIB(4) BSD Kernel Interfaces Manual PIIXPCIB(4)NAME
piixpcib -- Intel PIIX4 PCI-ISA bridge with SpeedStep
SYNOPSIS
piixpcib* at pci? dev ? function ?
isa* at piixpcib?
DESCRIPTION
The piixpcib driver provides support for the Intel PIIX and compatible PCI-ISA Bridges with Intel's first generation SpeedStep.
Frequency scaling is supported on Pentium III with two voltage modes, used by SpeedStep as power states low and high. The driver will switch
into low power state by reducing voltage and frequency of the CPU. The factor depends on the processor itself, but will always reduce power
consumption about 1/2.
The user can manually control the CPU frequency with the sysctl(8) program using the following node:
machdep.speedstep_state = [0/1]
SEE ALSO est(4), isa(4), pci(4), apmd(8), sysctl(8)HISTORY
The piixpcib driver first appeared in FreeBSD 5.5 and then in NetBSD 4.0.
AUTHORS
The current piixpcib driver was written by Bruno Ducrot. It was ported to NetBSD by Jared D. McNeill <jmcneill@NetBSD.org>.
BSD March 1, 2011 BSD
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