PSB Speakers PSB-1688LF M1 - Manual (Page 58)

Chapter 4 Award BIOS Setup
PSB-1688LF USER
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S MANUAL Page: 4-11
OS SELECT FOR DRAM > 64MB:
Select the operating system that is running with greater than 64MB of RAM
on the system.
VIDEO BIOS SHADOW:
Determines whether video BIOS will be coped to RAM. However, it is
optional depending on chipset design. Video Shadow will increase the
video speed.