NEC POWERMATE PRO2180 - SERVICE 1996, Руководство по обслуживанию

Страница: 75 / 195

Setup and Operation 2-35
ISA LFB Base Address
This field cannot be entered; it is an information field only. If the ISA LFB field is
“Disabled,” this field does not appear..
The ISA Video LFB Base Address field displays “15 MB” (the starting address of the ISA
memory hole) if “1 MB” is chosen as the ISA LFB Size parameter.
Video Palette Snoop
The Video Palette Snoop field enables card “snoop” (also called RAMDAC shadowing)
write cycles to the ISA video card’s palette registers. This field can be either “Enabled” or
“Disabled.” The default is “Disabled.”
This should only be set to “Enabled” if all of the following conditions occur.
n
An ISA card connects to a PCI Graphics card via the VESA connector
n
The ISA card connects to a color monitor
n
The card uses the RAMDAC on the PCI card
n
The palette snooping feature is broken on the PCI card
Latency Timer (PCI Clocks)
The Latency Timer (PCI CLOCK) field controls the length of time an agent on the PCI bus
can hold the bus when another agent has requested the bus. Value choices range between 0
and 256. The default value is 66.
In general this should not be changed. If there are latency sensitive cards in the system (such
as audio cards and/or network cards with small buffers) the parameter can be set to a lower
value to reduce latency.
If there are no latency sensitive cards in the system, but I/O intensive applications are being
run, the parameter can be increased to slightly improve performance.
Memory Error Detection
Memory Error Detection sets the type of error detection or correction. This field will
appear when either ECC or parity SIMMs are detected. Parity and ECC (36-bit) SIMMs
may be configured to run as either one. The default is “Disabled.” The following choices are
available.
n
Disabled (default)
n
Parity
n
ECC