Chapter 2 Installation
33
External speaker (JP13)
Pin
Function
5
Vcc
4
Speaker output
3
Buzzer in
2
Speaker output
1
NC
Reset switch (JP14)
You can connect an external switch to easily reset your computer.
This switch restarts your computer as if you had turned off the
power then turned it back on. The following table shows the pin
assignments for the JP14.
Reset switch (JP14)
Pin
Function
1
Ground
2
Reset
Turbo LED (JP15)
You can connect a LED indicator across JP15 to indicate when the
CPU is in Turbo mode. Marks on the circuit board indicate LED
polarity (the pin on the left is positive).
Turbo LED (JP15)
Pin
Function
1
Turbo
2
Ground
Turbo switch (JP17)
You can connect a switch across the pins of JP17 to change the
CPU speed between Turbo and non-Turbo mode. When you leave
the pins open, the CPU card operates at full speed. When you close
the pins, the card operates at slow speed for compatibility with
older software.
Turbo switch (JP17)
Pin
Function
Low speed
High Speed
1
- Deturbo
2
Pull low
Содержание SBC-400
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