TYAN TEMPEST II Manual page 14

3.4 Installing a Second Pentium
The mainboard can operate with either one or two Pentium proces-
sors installed. In the Single Processor mode, with a Pentium P54C installed
in the lower socket, the mainboard will operate like a normal single Pentium
system. To use the Dual Processor mode you have to install a Pentium
P54C or P54CM. The mainboard default setup is for the Single Processor
operation. To install a second processor do the followings.
1.Set J41 to the Dual Processor setting
2.Make sure the second Pentium has the same an internal clock
speed as the the first CPU which has a multiple external clock
speed factor of 1.5.
Internal Clock
75MHz
90MHz
100MHz
120MHz
133MHz
150MHz
166MHz
In the table above, the 50, 60 and 66 MHz figures are oscillator speeds that
establish the external clock speed. The PCI Bus clock speed is fixed at one
half of the external clock speed.
J41: Single/Dual CPU Selector
1
Single Processor mode
P54C in "A" or "B" socket
S1462-001-01
External Clock
50MHz(PCI Bus 25MHz)
60MHz(PCI Bus 30MHz)
66MHz(PCI Bus 33MHz)
60MHz(PCI Bus 30MHz)
66MHz(PCI Bus 33MHz)
60MHz(PCI Bus 30MHz)
66MHz(PCI Bus 33MHz)
1
Dual Processor mode
P54C in "A" socket
P54C or P54CM in "B" socket
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