Chapter 16: CPU clock, system jumpers, user jumper, and BIOS
recovery
CPU clock
The system clock speed for the CPU is 33.3 MHz. Jumper block W3 sets the
multiplier. Table 16
−
1 shows the jumper settings for W3.
Table 16
−
1 CPU clock speed: W3
W3
−
CPU Clock Speed
Clock Speed
Jumpers
W3[2
−
4]
233 MHz
W3[1
−
2]*
300 MHz
*default (see figure 16
−
1)
Figure 16
−
1 W3 jumper pin locations
2060
W3
1 3
2 4
W2
1 3
2 4
W1
System jumpers
Various system function options are selected with jumper block W1.
The “S” jumper selects whether the card boots from user defined parameters
(defined in the Setup Programs chapter), or the BIOS defaults. Removing this
jumper allows the user to return to factory programmed defaults.
The “X” enables or disables the BIOS extension area. The default is enabled, which
uses the INT17 calls.
The “V” jumper enables or disables the on-card video, allowing an external video
card, or the serial console to be used.
The “U” jumper is user defined and can be used for program control.
The “R” jumper, when removed, allows the BIOS to be reinstalled from a remote
system over a serial console connection.
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Содержание 2060 PC/104
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