American Megatrends MAN-758 manual Chipset Setup, Continued, MegaRUM PCI Motherboard User’s Guide

Chipset Setup, Continued

PCI VGA USWC/Video Frame Buffer Set this option to Enabled to enable the USWC memory attribute and improve video performance when a PCI video adapter is installed. However, VGA card drivers may not behave correctly when this option is set to Enabled. This option is only available if the PCI VGA card supports pre- fetchable video frame buffers.

The settings are Disabled or Enabled. The Optimal and Fail-Safe defaults are Disabled.

Optional ROM The MegaRUM motherboard has an empty option ROM socket. You can install a 32 KB ROM in this socket. The starting memory address of this ROM can be either C000h (only if this computer does not have a VGA controller), C800h, D000h, or D800h. The following three Chipset Setup options configure the option ROM only if you have installed a ROM chip in the option ROM socket.

Optional ROM Decode This option specifies the starting address of an adapter ROM to be decoded. The settings are C000h, C800h, D000h, D800h, or Disabled. The Optimal and Fail-Safe defaults are Disabled.

Optional ROM Shadow Before Init Set this option to Enabled to permit the contents of the option ROM to be copied to RAM before being initialized by AMIBIOS during Power On Self Test. This option does not appear if the Optional ROM Decode option is set to Disabled. The settings are Disabled or Enabled. The Optimal and Fail-Safe default settings are Disabled.

Optional ROM Cacheable Set this option to Enabled to allow the contents of the option ROM to be read from or written to cache memory. This option does not appear if the Optional ROM Shadow Before Init option is set to Disabled. The settings are Enabled or Disabled. The Optimal and Fail-Safe default settings are Disabled.

Cont’d

58MegaRUM PCI Motherboard User’s Guide