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Setup and Operation 2-19
n
PCI Burst
n
Banks 0 and 1 SIMM Detected
Base Memory Size
The Base Memory Size field controls the mapping of addresses between “512 KB” and
“640 KB.” The two choices are described as follows.
n
512 KB
−
directs address mapping between 512 KB and 640 KB to the ISA bus.
n
640 KB (default)
−
directs address mapping between 512 KB and 640 KB to the
system DRAM. Unless using an ISA expansion board that requires access to this
address range, this field should not be changed.
ISA LFB Size
The ISA Video Linear Frame Buffer (LFB) Size provides a mechanism for creating a hole in
the system memory map. Address accesses made to this hole will be directed to the ISA bus
instead of main memory.
This “Disabled” setting should not be changed unless you are using an ISA board which has
memory greater than 64K, needs to be accessed by the CPU, and you are not using the Plug
and Play run-time utilities. The following choices are available.
n
Disabled (default)
n
1 MB
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 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 are 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
Summary of Contents for POWERMATE P - SERVICE MANUAL 1995
Page 37: ...1 22 Technical Information ...
Page 169: ...Index 5 ...