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		  Undocumented Settings for Diamond TV
		  ====================================

			     by Ralf Brown
			      Version 1.0
			   February 16, 1997


Diamond's DTV.EXE program (and associated DLLs) for the Diamond
Stealth64 Video 2xx1-series video cards has some interesting features
which may be enabled by adding appropriate settings in \WINDOWS\DTV.INI
and \WINDOWS\DMMTV.INI.  All of the features described here are based
on a Stealth64 Video 2201TV card with an ITT3220 tuner; your mileage
may vary if your card has a Philips SAA7111 tuner or one of the other
configurations which appears to be supported by DMMTV.DLL.


In DTV.INI section [Debug]:

	SkipDisplayFreq=1
	SkipRestoreFreq=1
		By default, the DTV program switches the screen refresh
		rate down to 72 Hz if it is higher than that at
		startup, then restores the prior rate on exit.  This
		causes an annoying rolling, and the disappearance and
		redrawing of all windows on the screen.  Setting both
		of the above values to 1 turns of the change in refresh
		rate, which had no adverse effect on my system at
		1024x768 @ 75 Hz.

	DebugMenu=1
		This setting enables some additional menu entries:
		three items on the Capture menu and one on the Help
		menu (which is an odd place to put an item that gives
		you direct access to the tuner's registers...).
		[Side note: The "I2C" entry on the Help menu refers to
		the I2C bus invented by Philips for consumer
		electronics such as TVs and VCRs; it is the ancestor of
		the ACCESS.bus which forms the physical layer of the
		Universal Serial Bus.]

	ForcePreview=?
		This setting is not yet understood.  A value of 1
		caused a completely black TV window.


In DTV.INI section [Settings]:

	TipDelayMS=nnn
		Set the time before Tool Tips for a button pop up to
		"nnn" milliseconds
	AutoMS=nnn
		Set the pause for locking onto each channel during the
		channel auto-programming to "nnn" milliseconds


In DTV.INI section [OnScreen]

	ShowInputSize=1
		Display the size of the image coming from the
		tuner/digitizer in the upper left-hand corner, just
		below the on-screen size (if enabled).  I was quite
		surprised to find that the digitized image for a
		320x240 on-screen window was only 88 pixels wide in
		HiColor mode -- no wonder the picture looked fuzzy!
		In 256-color mode, the digitizer is sending 250x248
		pixels for a 320x240 on-screen window, and a full
		644x248 for a 1024x708 on-screen window (compared to
		only 276x248 in HiColor mode).


In DMMTV.INI section [DMMTV]:

	TunerType=N
		TunerType=1 is the ITT3220 in my board, TunerType=0
		appears to be the Philips SAA7111

	5252Reg0=nnn
		Apparently intended to configure the closed-captioning
		decoder, but does not have any visible effect on my
		system, since DTV.EXE seems to merely read the CC data
		and display the decoded text itself.
		From Philips data sheets, the SAA5252 register 0
		contains the following bit fields:
			bit 7	read CC from second field, not first
			bit 6	video output is negative-going, not positive
			bit 5	horizontal sync pulse has positive polarity
			bit 4	vertical sync pulse has positive polarity
			bits 3-0: offset from start of horizontal sync pulse

	5252Reg1=nnn
		Apparently intended to configure the closed-captioning
		decoder, but does not have any visible effect on my
		system.
		From Philips data sheets, the SAA5252 register 1
		contains the following bit fields:
			bit 7	clear page memory
			bit 6	user channel selection (0=Ch2, 1=Ch1)
			bit 5	check lines 19-23, not just line 21
			bit 4	disable CC decoding and acquisition
			bits 3-2 enhanced caption mode
				00 shadowed character, video background
				01 shadowed character, mesh background
				10 normal character, video background
				11 normal character, mesh background
			bits 1-0 enhanced display mode
				00 video only
				01 text only
				10 normal caption mode
				11 enhanced caption mode

In DMMTV.INI section [ODS]:

	Debug=1
		Enable debugging messages; this probably requires the
		Windows debug kernel, as it has no apparent effect on
		my system.

In DMMTV.INI section [TunerFrequencies]:

	NumEntries=nn
		Specify the number of EntryNN= items in this section
	EntryN= mode standard channel frequency band
		(N="1" to value specified in NumEntries) Override the
		built-in tuning table for a particular channel in a
		particular TV standard/TV mode (broadcast/cable)
		combination.  On my system, attempting to override an
		unused channel caused a GPF in DMMTV.DLL, followed by
		crashes in STLTHCAP.DRV and Explorer.


In SYSTEM.INI section [STLTHCAP.DRV]:

	Hue=
	Saturation=
	Brightness=
	Contrast=
	VideoStandard=nn
	     0 = NTSC
	     1 = PAL
	VideoCable=nn
	     0	  composite1 ?
	     1	  composite2 ?
	     2	  S-Video ?
	Size40=nn
	     maximum size which can be captured; default = 8 is 320x240;
	     max = 16 is 640x480, min = 1 is 40x30
	VideoFormat=nn
	     0
	     1
	     2
	     3
	     4


Additional settings are also found in RFMK2V.INI, I2CDEBUG.INI,
K2V_DIG.INI, K2V_HWC.INI, and K2V_SWC.INI.


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