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-
- Hi everybody,
-
- If anyone is still plagued with the double-vbl problem on their Falcon/VGA, then
- here's a permanent cure for it:
-
- Look for the 3 black inductors just below the monitor port on the Falcon PCB. The
- two leftmost inductors are the horizontal & vertical sync lines. The third is the
- composite video signal. Remove the two on the left and replace them with a couple
- of 75ohm resistors.
-
- After making this modification, the double-vbl problem will disappear.
-
- The problem itself is simply (weak) echos on the vertical sync line bouncing
- between the monitor and Falcon, sometimes setting off an extra vertical blank. The
- load resistors eliminate the echos and allow the Falcon to stay in sync with the
- monitor.
-
- Doug.
-
-