NEC MC2200, Руководство пользователя

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Configuring Your System 3-19
Table 3-10. System Board Jumper Configurations
Jumper Description Option Setting Factory
Default Your
Settin
g
Reserved
J7A Required on factory default. 2-3 2-3 2-3
FLASH
Code
J6A FLASH
reprogramming
power protection BIOS not write protected; FLASH update
BIOS write protected; no FLASH update 1-2
2-3 1-2
Reserved
J5A Required on factory default. 1-2 1-2 1-2
CPU
Speed
J4A Used with jumpers
at J1A, J2A, J3A,
J5B and J5B to set
CPU speed Refer to Table 3-11 to set CPU speed. Bus:CP
Freq = 1:4 or 2:9 = pins 1-2; Bus:CP Freq =
1:2, 1:3, 2:5 or 2:7 = pins 2-3 Dependent on speed of
installed CPU.
CPU
Speed
J3A Used with jumpers
at J1A, J2A, J4A,
J5B and J5B to set
CPU speed Refer to Table 3-11 to set CPU speed. Bus:CP
Freq = 1:3 or 2:7 = pins 1-2; Bus:CP Freq =
1:2, 1:4, 2:5 or 2:9 = pins 2-3 Dependent on speed of
installed CPU.
CPU
Speed
J2A Used with jumpers
at J1A, J3A, J4A,
J5B and J5B to set
CPU speed Refer to Table 3-11 to set CPU speed.
Bus:CP Freq = 1:2, 1:3, 1:4, 2:5, 2:7 or 2:9 =
pins 2-3 Dependent on speed of
installed CPU.
CPU
Speed
J1A Used with jumpers
at J2A, J3A, J4A,
J5B and J5B to set
CPU speed Refer to Table 3-11 to set CPU speed.
Bus:CP Freq = 2:5 2:7, or 2:9 = pins 1-2;
Bus:CP Freq = 1:2, 1:3 or 1:4 = pins 2-3 Dependent on speed of
installed CPU.
Reserved
J7B Required on factory default. 1-2 1-2 1-2
Reserved
J6B Required on factory default. 1-2 1-2 1-2
CPU
Speed
J5B Used with jumpers
at J1A, J2A, J3A
and J4A to set
CPU speed Refer to Table 3-11 to set CPU speed.
Bus Freq = 60 MHZ = pins 1-2;
Bus Freq = 66 MHZ = pins 2-3 Dependent on speed of
installed CPU.
Model
Type
J4B Used with jumpers
at J25, J26, J27,
J29, J51, J52, J53
and J54 to set
server model type Required on factory default. 2-3 2-3 2-3
Reserved
J3B Required on factory default. 1-2 1-2 1-2
Password
Clear
J2B Password
protection Password protection enabled
Password cleared; protection off 1-2
2-3 1-2
CMOS
Clear
J1B Real-time clock
CMOS protection RTC CMOS protection enabled
RTC CMOS cleared to factory defaults 1-2
2-3 1-2
Reserved
J21 All nine jumpers
must be in Required on factory default. IN IN IN