Chapter 4: BIOS
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transmission speed may be required for long and busy lines. The options are 9600, 19200,
57600, and 115200 (bits per second).
Flow Control
Use this item to set the ow control for Console Redirection to prevent data loss caused by
buffer overow. Send a "Stop" signal to stop sending data when the receiving buffer is full.
Send a "Start" signal to start sending data when the receiving buffer is empty. The options
are None, Hardware RTS/CTS, and Software Xon/Xoff.
Data Bits
Use this feature to set the data transmission size for Console Redirection. The options are
7 (Bits) and 8 (Bits).
Parity
A parity bit can be sent along with regular data bits to detect data transmission errors. Select
Even if the parity bit is set to 0, and the number of 1's in data bits is even. Select Odd if the
parity bit is set to 0, and the number of 1's in data bits is odd. Select None if you do not want
to send a parity bit with your data bits in transmission. Select Mark to add a mark as a parity
bit to be sent along with the data bits. Select Space to add a Space as a parity bit to be sent
with your data bits. The options are None, Even, Odd, Mark and Space.
Stop Bits
A stop bit indicates the end of a serial data packet. Select 1 Stop Bit for standard serial data
communication. Select 2 Stop Bits if slower devices are used. The options are 1 and 2.
ACPI Settings
High Precision Event Timer
Select Enabled to activate the High Performance Event Timer (HPET) that produces periodic
interrupts at a much higher frequency than a Real-time Clock (RTC) does in synchronizing
multimedia streams, providing smooth playback and reducing the dependency on other
timestamp calculation devices, such as an x86 RDTSC Instruction embedded in the CPU.
The High Performance Event Timer is used to replace the 8254 Programmable Interval Timer.
The options are Enabled and Disabled.
WHEA Support
This feature Enables the Windows Hardware Error Architecture (WHEA) support for the
Windows 2008 (or a later version) operating system. The options are Enabled and Disabled.
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