Burst Electronics BG-3 - Manual (Page 21)

The EEPROM Size is reminder of the maximum pixel count for the image you load into the
software. The maximum pixel count is 65,280.
The Video Mode allows for the OSD image to be loaded into either a NTSC (525 line) frame, or
a PAL (625 line) frame. PAL a nd NTSC test patterns are selected by use of a jumper that is
internally mounted within the BG-3/BG-7 hardware (JP2).
A large EXIT button has also been placed in this field that is used to exit the program.
Status Bar
This field is located across the bottom of the software interface. Within this field, data being
transmitted from both the software and hardware is displayed. There is also a small box on the
far right indicating the selected COM port and whether communication has been established.
There are three (3) colors associated with this box, Red meaning no communication between
software and hardware, Cyan meaning an attempt at communication is progressing, and Green
meaning that communication has been established.
NTSC / PAL Selection
Both a software change and a hardware change must be made to change the video standard
the BG-3/BG-7 outputs. In software, change the Video Mode to the appropriate standard you
wish to use. This is located on the main screen near the bottom right under the heading Video
Mode. In hardware, you must remove the top cover and replace the jumper to the video
standard you wish to use. This jumper is labeled JP2 and also has the labeling PAL-NTSC. It is
a 3 pin header with a jumper installed for NTSC (inside pin to center for NTSC, outside pin to
center for PAL). Once this jumper has been placed, all you need to do is cycle power to have
the change take affect (or create a momentary short between the RESET pins at JP5 if power
is still on).
Creating OSD Images
The BG-3/BG-7 uses a 24-bit full color bitmap (BMP) as the OSD image. The OSD image size
must not exceed 65,280 pixels. Also, the width of the OSD image must not exceed 720 pixels
and the height must not exceed 508 pixels. This does not mean that the maximum OSD image
size is 720x508. The Width of the OSD image must be divisible by 4, and the Height must be
divisible by 2. This does seem a little complex, but if you follow the following rules, you will be
able to create just about any OSD image you like.
Maximum color depth - 24-Bit
Maximum pixel count - 65,280
Maximum Width - 720 (must be evenly divisible by 4)
Maximum Height - 508 (must be evenly divisible by 2)
Default Transparency - RGB = 255 (Red = 255, Green = 255, Blue = 255)
An example maximum width OSD image of 720 would have a max height of 90. 720 is evenly
divisible by 4 and 90 is evenly divisible by 2, also 720 x 90 is 64,800 which is less than 65,280.
BG-3 and BG-7 Test Pattern Generator 21