Irix 6 specific files -- thanks Sjoerd!
diff --git a/Lib/plat-irix6/SV.py b/Lib/plat-irix6/SV.py
new file mode 100644
index 0000000..08fb917
--- /dev/null
+++ b/Lib/plat-irix6/SV.py
@@ -0,0 +1,120 @@
+NTSC_XMAX = 640
+NTSC_YMAX = 480
+PAL_XMAX = 768
+PAL_YMAX = 576
+BLANKING_BUFFER_SIZE = 2
+
+MAX_SOURCES = 2
+
+# mode parameter for Bind calls
+IN_OFF = 0 # No Video
+IN_OVER = 1 # Video over graphics
+IN_UNDER = 2 # Video under graphics
+IN_REPLACE = 3 # Video replaces entire win
+
+# mode parameters for LoadMap calls. Specifies buffer, always 256 entries
+INPUT_COLORMAP = 0 # tuples of 8-bit RGB
+CHROMA_KEY_MAP = 1 # tuples of 8-bit RGB
+COLOR_SPACE_MAP = 2 # tuples of 8-bit RGB
+GAMMA_MAP = 3 # tuples of 24-bit red values
+
+# mode parameters for UseExclusive calls
+INPUT = 0
+OUTPUT = 1
+IN_OUT = 2
+
+# Format constants for the capture routines
+RGB8_FRAMES = 0 # noninterleaved 8 bit 3:2:3 RBG fields
+RGB32_FRAMES = 1 # 32-bit 8:8:8 RGB frames
+YUV411_FRAMES = 2 # interleaved, 8:2:2 YUV format
+YUV411_FRAMES_AND_BLANKING_BUFFER = 3
+
+#
+# sv.SetParam is passed variable length argument lists,
+# consisting of <name, value> pairs. The following
+# constants identify argument names.
+#
+_NAME_BASE = 1000
+SOURCE = (_NAME_BASE + 0)
+SOURCE1 = 0
+SOURCE2 = 1
+SOURCE3 = 2
+COLOR = (_NAME_BASE + 1)
+DEFAULT_COLOR = 0
+USER_COLOR = 1
+MONO = 2
+OUTPUTMODE = (_NAME_BASE + 2)
+LIVE_OUTPUT = 0
+STILL24_OUT = 1
+FREEZE = (_NAME_BASE + 3)
+DITHER = (_NAME_BASE + 4)
+OUTPUT_FILTER = (_NAME_BASE + 5)
+HUE = (_NAME_BASE + 6)
+GENLOCK = (_NAME_BASE + 7)
+GENLOCK_OFF = 0
+GENLOCK_ON = 1
+GENLOCK_HOUSE = 2
+BROADCAST = (_NAME_BASE + 8)
+NTSC = 0
+PAL = 1
+VIDEO_MODE = (_NAME_BASE + 9)
+COMP = 0
+SVIDEO = 1
+INPUT_BYPASS = (_NAME_BASE + 10)
+FIELDDROP = (_NAME_BASE + 11)
+SLAVE = (_NAME_BASE + 12)
+APERTURE_FACTOR = (_NAME_BASE + 13)
+AFACTOR_0 = 0
+AFACTOR_QTR = 1
+AFACTOR_HLF = 2
+AFACTOR_ONE = 3
+CORING = (_NAME_BASE + 14)
+COR_OFF = 0
+COR_1LSB = 1
+COR_2LSB = 2
+COR_3LSB = 3
+APERTURE_BANDPASS = (_NAME_BASE + 15)
+ABAND_F0 = 0
+ABAND_F1 = 1
+ABAND_F2 = 2
+ABAND_F3 = 3
+PREFILTER = (_NAME_BASE + 16)
+CHROMA_TRAP = (_NAME_BASE + 17)
+CK_THRESHOLD = (_NAME_BASE + 18)
+PAL_SENSITIVITY = (_NAME_BASE + 19)
+GAIN_CONTROL = (_NAME_BASE + 20)
+GAIN_SLOW = 0
+GAIN_MEDIUM = 1
+GAIN_FAST = 2
+GAIN_FROZEN = 3
+AUTO_CKILL = (_NAME_BASE + 21)
+VTR_MODE = (_NAME_BASE + 22)
+VTR_INPUT = 0
+CAMERA_INPUT = 1
+LUMA_DELAY = (_NAME_BASE + 23)
+VNOISE = (_NAME_BASE + 24)
+VNOISE_NORMAL = 0
+VNOISE_SEARCH = 1
+VNOISE_AUTO = 2
+VNOISE_BYPASS = 3
+CHCV_PAL = (_NAME_BASE + 25)
+CHCV_NTSC = (_NAME_BASE + 26)
+CCIR_LEVELS = (_NAME_BASE + 27)
+STD_CHROMA = (_NAME_BASE + 28)
+DENC_VTBYPASS = (_NAME_BASE + 29)
+FAST_TIMECONSTANT = (_NAME_BASE + 30)
+GENLOCK_DELAY = (_NAME_BASE + 31)
+PHASE_SYNC = (_NAME_BASE + 32)
+VIDEO_OUTPUT = (_NAME_BASE + 33)
+CHROMA_PHASEOUT = (_NAME_BASE + 34)
+CHROMA_CENTER = (_NAME_BASE + 35)
+YUV_TO_RGB_INVERT = (_NAME_BASE + 36)
+SOURCE1_BROADCAST = (_NAME_BASE + 37)
+SOURCE1_MODE = (_NAME_BASE + 38)
+SOURCE2_BROADCAST = (_NAME_BASE + 39)
+SOURCE2_MODE = (_NAME_BASE + 40)
+SOURCE3_BROADCAST = (_NAME_BASE + 41)
+SOURCE3_MODE = (_NAME_BASE + 42)
+SIGNAL_STD = (_NAME_BASE + 43)
+NOSIGNAL = 2
+SIGNAL_COLOR = (_NAME_BASE + 44)