Compaq MSB900L user manual Digital-Logic Ag, MSB900/L Detailed Technical Manual

DIGITAL-LOGIC AG MSB900/L Detailed Technical Manual V1.0

CMOS Map continued...

Location	Description
0Eh	CMOS Location for Bad CMOS and Checksum Flags
	Bit 7	= Flag for CMOS Lost Power
		0		=	Power OK
		1		=	Lost Power
	Bit 6	= Flag for CMOS checksum bad
		0		=	Checksum is valid
		1		=	Checksum is bad
0Fh	Shutdown Code
10h	Diskette Drives
	Bits 7-4	= Diskette Drive A
		0000		=	Not installed
		0001		= Drive A = 360 kB
		0010		= Drive A = 1.2MB
		0011		= Drive A = 720 kB
		0100		= Drive A = 1.44MB
		0101		= Drive A = 2.88MB
	Bits 3-0	= Diskette Drive B
		0000		=	Not installed
		0001		= Drive B = 360 kB
		0010		= Drive B = 1.2MB
		0011		= Drive B = 720 kB
		0100		= Drive B = 1.44MB
		0101		= Drive B = 2.88MB
11h	Reserved
12h	Fixed (Hard) Drives
	Bits 7-4	= Hard Drive 0, AT Type
		0000		=	Not installed
		0001-1110		=	Types 1-14
		1111		= Extended drive types 16-44.
					See location 19h.
	Bits 3-0	= Hard Drive 1, AT Type
		0000		=	Not installed
		0001-1110		=	Types 1-14
		1111		= Extended drive types 16-44.
					See location 2Ah.
13h	Reserved
14h	Equipment
	Bits 7-6	= Number of Diskette Drives
		00	=		One diskette drive
		01	=		Two diskette drives
		10, 11 =			Reserved
	Bits 5-4	= Primary Display Type
		00	=		Adapter with option ROM
		01	=		CGA in 40 column mode
		10	=		CGA in 80 column mode
		11	=		Monochrome
	Bits 3-2	= Reserved
	Bit 1	= Math Coprocessor Presence
		0	=		Not installed
		1	=		Installed
	Bit 0	= Bootable Diskette Drive
		0	=		Not installed
		1	=		Installed

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