Crystal Vision
Card edge operation
25
DEC102SUser ManualV1.0 05/11/03
Setting decoder modes
There are four decoder modes, selected by a combination of four-lever switch, Adjust
control and on-board jumpers:
•
10 bit composite – uses a line-based comb decoder, which mixes to simple
decoder when the comb would produce artefacts
•
8 bit composite – robust simple decoder suitable for use with poorly timed
sources such as VHS recorders
•
10-bit YC – Y/C (S-video) mode selected for well-timed inputs
•
8-bit YC – Y/C (S-video) robust mode suitable for use with poorly timed sources
such as VHS recorders
If switch lever 1 is left in the UP position 10-bit or 8-bit mode is selected automatically. If
switch lever 1 is left in the DOWN position the choice can be made using an on-board
jumper link, J5.
Link
Position
Function
J5
Board centre
Manually select 10 or 8-bit operation when piano switch 1 is DOWN
Link to the rear – forces 8-bit operation
Link to the front – forces 10-bit operation
The decoder modes and the required lever, jumper and ADJ control settings are
summarised below:
Desired setting
Mode lever and jumper settings
Composite, 10 bit
Lever 3 UP and Lever 1 UP (or Lever 1 DOWN with J5 in 10-bit
position – away from edge connector)
Composite, 8 bit
Lever 3 UP and Lever 1 UP (or Lever 1 DOWN with J5 in 8-bit
position – towards edge connector)
Y/C, 10 bit
Lever 3 DOWN and Lever 1 UP (or Lever 1 DOWN with J5 in
10-bit position – away from edge connector)
Y/C, 8 bit
Lever 3 DOWN and Lever 1 UP (or Lever 1 DOWN with J5 in 8-
bit position – towards edge connector)
Notes:
Decoder modes are not shown on the display but will be adaptive Comb in 10 Bit mode
and Simple in 8-bit mode.
The location of jumper links is shown in the module configuration section of the
Installation chapter.
