2-3
Jumper Settings
Jumper Settings
Table 2-1: Jumper settings to select the speed of the CPU.
Jumper
CPU Speed
W4
W5
W8
75MHz External / 50MHz Internal
closed
closed
1-2
90MHz External / 60MHz Internal (default)
open
closed
2-3
100MHz External / 66MHz Internal
closed
open
2-3
120MHz External / 60MHz Internal
open
closed
2-3
133MHz External / 66MHz Internal
closed
open
2-3
150MHz External / 60MHz Internal
open
closed
2-3
167MHz External / 66MHz Internal
closed
open
2-3
Table 2-1: CPU Speed Selection
Table 2-2: Jumper settings to set the CPU/BUS speed ratio.
Jumper
Speed Ratio
W2
W10
2/3 (1.5X) Clock (75/90/100MHz) (default)
open
open
1/2 (2.0X) Clock (120MHz/133MHz)
closed
open
2/5 (2.5X) Clock (150MHz/167MHz)
closed
closed
Table 2-2: CPU Bus Speed Selection
Table 2-3: Jumper settings to set the CPU VRE setting.
Table 2-3: CPU VRE Selection
6
6
Jumper
Function
Settings
W14
VR (75/90MHz) (default)
VRE (100/120/133/150/166)
Open
Close
