## Physical Device Driver Reference

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### SCR_ALLOCLDTBGVAL (76h) - Options

Options Characteristics of Video RAM (VRAM) address space are customized with the Options parameter. The following values are valid:

0 Make segment readable code; no validation in background
1 Make segment writable data; no validation in background
2 Free selector
3 Make segment readable IOPL code
4 Make segment Read/Write IOPL data
5 Tag selectors Physical Video Buffer (PVB); make segment writable data with validation in background
Other Reserved