Brooktree Bt848/849 and Bt878/879 VXD Drivers v4.1.8.8
Modified by Rainbow Software to work with cards with 14MHz crystal
Released at 5th September 2000
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Please read CONEXANT.TXT file for the original release notes.

Installation:
  Unpack ZIP file to a directory on hard drive. Remove any previous installed
  drivers for your video capture card and enter directory where you unpacked
  these drivers when Windows prompts you for a driver.

Uninstallation:
  Remove card from Device Manager, then remove all (two or three) lines from
  SYSTEM.INI file from section [drivers32] saying something=btvvc32.drv.
  Finally, delete all driver files from WINDOWS\SYSTEM directory (look for
  files that are same as files in this package) and delete INF file from
  WINDOWS\INF directory called Rainbow SoftwareBT8X8_14.INF

Description:
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These drivers are intended for users of video capture cards based on Bt848A
chip with 14MHz crystal. They can be used also for Bt849, Bt878 and Bt879,
where they work just as standard Conexant drivers.
How do you know you have 14MHz crystal? Here are two methods.
 1. Look at the card, there should be main chip and a few other components.
    On one component, there is a number written saying xxx MHz. If it says
    something with 14, you have it.
 2. Any drivers you have tried (except original that came with the card) does
    not work properly. Picture is displayed 4 times in the preview window and
    it's black-and-white only.

I have merged Conexant's three INF files (video, audio and codec) to one file
called BT8X8_14.INF. Codecs are installed automatically with video capture.

Why these modified drivers?
I have an older PCI video capture card that was bought in a cheap pack with
CyberEye internet camera. The card is very simple. It has only Bt848A chip,
three or four capacitors and one crystal. The card has also one S-Video and
three cinch video inputs. The drivers that came with the card are burned on a
CD-R (!?) with no label. There is only a sticker with VideoLive Mail serial
number on the package. The CD contains drivers, DirectX 5 in 9 languages,
Internet Explorer 4.0 in 5 languages, NetMeeting 2.1 in 2 languages and
VideoLive Mail. There is even a file KEY.TXT with another VideoLive serial
number (!). The drivers are also VERY OLD - v2.2.223, dated from 11.8.1997 to
31.12.1997.
Because the drivers were old and bad, I want to download a newer ones. The
main problem was that the card is absoulutely no-name and I don't have the
original box anymore. So I downloaded a lot of drivers for cards with Bt848
chip. Some didn't work at all, but the ones that do have all the same problem.
The picture in capture window was shown four times and black-and-white only.
I did some experiments and found out that it's caused by the 14MHz crystal
on my card. Standard crystal according the documentation is 28MHz. I also
found that there is a RefFreq registry entry that specifies the crystal
installed. These drivers are basically standard Conexant drivers with the
new INF file that sets RefFreq to 14MHz. It may look simple, but it works
perfectly. These drivers are a lot better than original 2.2.233, especially
the performance is a lot higher.

System requirements:
--------------------
These drivers are VXD drivers. This means that they can be used with Windows
95, Windows 98, Windows 98SE and probably Windows ME. They CAN'T be used with
Windows NT or Windows 2000.

This modified drivers are intended for Bt848A based video capture cards with
14MHz crystal. They will work also for Bt849, Bt878 and Bt879 cards. They can
be used with Bt848 with standard crystal, you must change manually the driver
from "Bt848 Video Capture Device (14MHz crystal)" to "Bt848 Video Capture
Device".

Distribution:
-------------
You can use these drivers drivers according to Conexant's license. I have not
seen any Conexant's license, so the drivers are probably free to use with
products based on Bt848/849/878/879. I am not restricting the distribution
of these drivers in any way if they are unmodified.

Known bugs:
-----------
These bugs are Conexant's bugs, I can't do anything with them:
 - computer hangs when going to suspend mode with overlay video running
 - input names are incorrect (tuner, s-video, composite and digital camera)
   S-Video is S-Video and other represents three cinch inputs
 - one cinch video input can't be used because it's used for digital video
   camera in this version of drivers, but you have another two plus S-Video   

Version history:
----------------
5th September 2000:
 - initial release
   (and final too, if it's bug-free or there will be new Conexant drivers)

Visit the Rainbow Software Home Page for updates.
Send bug reports to: rnbw@geocities.com

Contact:
--------
 home page - http://rnbw.tsx.org
 e-mail    - rnbw@geocities.com