Ampro Little Board 700, Reference Manual

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Chapter 3 Hardware
56 Reference Manual LittleBoard 700
Miscellaneous
Real Time Clock (RTC)
The LittleBoard 700 contains a Real Time Clock (RTC). The CMOS RAM is backed up with a Lithium
Battery. If the battery is not present, the BIOS has a battery-free boot option to complete the boot
process.
Temperature Monitoring
The MAX1617 (thermal sensor) performs the temperature monitoring function. This device has an input
connection from the thermal diode in the Intel Celeron or Pentium III CPU. The SMBus is connected to
a dedicated thermal alert pin in the MAX1617 and the other devices on the SMBus, including the
VT82C686B.
NOTE The LittleBoard 700 requires a heatsink for both Celeron CPUs and heatsink
and fan for the Pentium III CPU.
Oops! Jumper (BIOS Recovery)
The Oops! jumper is provided in the event the BIOS settings you’ve selected prevent you from booting
the system. By using the Oops! jumper you can prevent the current BIOS settings in the EEPROM from
being loaded, forcing the use of the default settings. Connect the DTR pin to the RI pin on serial port 1
(COM 1) prior to boot up to prevent the present BIOS settings from loading. After booting with the
Oops! jumper in place, remove the Oops! jumper and go into BIOS Setup. Change the desired BIOS
settings, or select the default settings, and save changes before rebooting the system.
To convert the Serial A interface to an Oops! jumper, short together the DTR (7) and RI (8) pins on
Serial A (J11) header for Serial Port 1. As an alternate, short the equivalent pins, 4 and 9, on the Serial
Port 1 DB9 connector as shown in Figure 3-2.
Serial A Interface (J11)
for Serial Port 1
(or COM1 Port)
1
2
3
4
5
6
7
8
9
10 20
19
Top View
5 4 3 2 1
9 8 7 6
Standard DB9 Serial
Port Connector (Female)
Rear View
Or
Figure 3-2. Oops! Jumper Connection
Serial Console
The LB 700 supports the serial console (or console redirection) feature. This I/O function is provided by
an ANSI-compatible serial terminal, or the equivalent terminal emulation software running on another
system. This can be very useful when setting up the BIOS on a production line for systems that are not
connected to a keyboard and display.
Serial Console Setup
The serial console feature is implemented by connecting a modified serial cable (or “Hot Cable”)
between serial port 1 (J11) and the serial terminal, or the PC with communications software. The serial
terminal, or PC with communications software, must be set to the following values:
•
115k Baud
•
8 bits
•
One stop bit
•
No parity
•
No hardware handshake