IBM 770 manual Information Word, Real Mode Entry Point, Bit or 32-Bit Protected, SMAPI BIOS B-5

Information Word

This area identifies the following BIOS service level:

Information Word

Bit ð : Real/V86 mode interface support

Bit 1 : 16-bit protected mode support

Bit 2 : 32-bit protected mode support

Bit 3-15 : Reserved

Real Mode Entry Point

The entry point is specified in segment, offset format. Clients using Real/V86 mode can use this area for the far-call value.

16-Bit or 32-Bit Protected	Mode	Entry	Point
The code base code address specifies the physical
address for		this BIOS, and the client must prepare the
selector	for	this	BIOS. The length should be 64 KB.

SMAPI BIOS B-5