DFI 486-OCV Plus User Manual page 17

486-OCV Plus
Jumper JP18
VL-Bus Ready Signal Select
If a VESA VL-Bus add-on board is installed in either
one of the VL-Bus slots and the 486-OCV Plus system
board is using a 486-50DX CPU, we recommend that
you set Jumper JP18 to "Delay 1 PCLK". Your system
board might not work properly if Jumper JP18 is set to
"No Delay".
1 2 3 1 2 3
1-2 On: Delay 1 PCLK 2-3 On:
(Default)
No Delay
Jumper JP34
VL-Bus Address Select
If the 486-OCV Plus system board is using a 40MHz or
50MHz 486DX CPU, VESA VL-Bus add-on boards
may not work when Jumper JP34 is set to "No Delay".
In this case, we recommend that you set Jumper JP34
pins 1-2 and 3-4 to On, "Delay 1 PCLK".
Set JP34 pins 2-3 to On if your system board is using a
386-25/33/40MHz or 486-25/33MHz CPU. If it is not
set to these recommended settings, your system might
hang.
1 2 3 4 1 2 3 4
1-2, 3-4 On: 2-3 On: No Delay
Delay 1 PCLK (Default)
Installation Overview u 2-10