B&R Industries Provit 5000, Руководство пользователя, Страница: 290 / 400

Provit 5000 User’s Manual 289
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Software • BIOS for System Unit with Socket 370
OS Select For DRAM > 64MB
If more than 64 MB DRAM is installed on your IPC, then you must select between
the operating system "OS2" and "Non-OS2".
Shadowing
Shadow settings are only valid for ISA cards. Shadowing means that software
which is found on a ROM chip of an ISA card (Firmware) in RAM, can be copied.
The data can be read from there with the faster system bus.
This results in improved performance of Firmware programs (e.g. BIOS, Video
BIOS etc.). However the size of high memory in RAM (640kB - 1MB) is reduced
(e.g. reduction in the high memory range available for loading device drivers).
Video BIOS Shadow and C8000-CBFFF Shadow
These options have no function, as the 42 KB size VGA BIOS is copied
(shadowed) into every section of RAM .
Note: The last 8 KB of the memory area C8000 to CBFFF are
available.
Memory Area D0000 - DFFFF
These areas can be occupied by Firmware on other expansion cards. If an
expansion peripheral in your system contains ROM based firmware, you need to
know the address range the ROM occupies to shadow it into the correct area of
RAM.