cmos.lst

中断列表(4) 712K

CMOS 20h - AMI WinBIOS - First Hard Disk user defined: Landing Zone, Low Byte
----------R20--------------------------------
CMOS 20h - PHOENIX - First user defined hard disk (type 48) Cylinders LSB
----------R20--------------------------------
CMOS 20h - AWARD - 2nd Hard Disk user defined (type 48): Number of Heads
----------R20--------------------------------
CMOS 20h - Quadtel HT 12 BIOS - FIRST USER DEFINED DRIVE
SeeAlso: CMOS 26h"Quadtel"

Bitfields for Quadtel landing zone/write-precompensation:
Bit(s)	Description	(Table C0026)
 7-4	landing zone MSB
 3-0	write precom. cyl. MSB
----------R21--------------------------------
CMOS 21h - MCA - Programmable Option Select configuration byte 2
----------R21--------------------------------
CMOS 21h - AMI - First Hard Disk user defined: Landing Zone, Low Byte
----------R21--------------------------------
CMOS 21h - AMI WinBIOS - First Hard Disk user defined: Landing Zone, High Byte
----------R21--------------------------------
CMOS 21h - AMSTRAD - MOUSE X SCALING FACTOR
Note:	default: 0Ah
----------R21--------------------------------
CMOS 21h - PHOENIX - First user defined hard disk (type 48) Cylinders MSB
----------R21--------------------------------
CMOS 21h - AWARD - 2nd Hard Disk user defined (type 48): Write Precomp Low Byte
----------R21--------------------------------
CMOS 21h - Quadtel HT 12 BIOS - first user def. drive: landing zone low byte
----------R22--------------------------------
CMOS 22h - MCA - Programmable Option Select configuration byte 3
----------R22--------------------------------
CMOS 22h - AMI - First Hard Disk user defined: Landing Zone, High Byte
----------R22--------------------------------
CMOS 22h - AMI WinBIOS - First Hard Disk user defined: # of Sectors per track
----------R22--------------------------------
CMOS 22h - AMSTRAD - MOUSE Y SCALING FACTOR
Note:	default: 0Ah
----------R22--------------------------------
CMOS 22h - PHOENIX - First user defined hard disk (type 48)	 of Heads
----------R22--------------------------------
CMOS 22h - AWARD - 2nd Hard Disk user defined (type 48): Write Precomp High Byte
----------R22--------------------------------
CMOS 22h - Quadtel HT 12 BIOS - first user def. drive: sectors per track
----------R23--------------------------------
CMOS 23h - MCA - Programmable Option Select configuration byte 4
----------R23--------------------------------
CMOS 23h - AMI - First Hard Disk user defined: # of Sectors per track
----------R23--------------------------------
CMOS 23h - AMI WinBIOS - Second Hard Disk user defined: # Cylinders, Low Byte
----------R23--------------------------------
CMOS 23h - AMSTRAD - INITIAL VDU MODE AND DRIVE COUNT
Note:	default: 20h

Bitfields for Amstrad initial VDU mode/drive count:
Bit(s)	Description	(Table C0027)
 7	enables extended serial flow control (NB this is buggy)
 6	set if two floppy drives installed
 5-4	(from Amstrad 1640 tech ref)
	00    Internal video adapter
	01    CGA card added; 40 x 25 mode
	10    CGA card added; 80 x 25 mode
	11    mono card added; 80 x 25 mode
----------R23--------------------------------
CMOS 23h - PHOENIX - First user defined hard disk (type 48) Write Precomp. LSB
----------R23--------------------------------
CMOS 23h - AWARD - 2nd Hard Disk user defined (type 48): Landing Zone Low Byte
----------R23--------------------------------
CMOS 23h - Quadtel HT 12 BIOS - second user def. drive: # of cylinders low byte
----------R24--------------------------------
CMOS 24h - MCA - Programmable Option Select configuration byte 5
----------R24--------------------------------
CMOS 24h - AMI - Second Hard Disk user defined: # Cylinders, Low Byte
----------R24--------------------------------
CMOS 24h - AMI WinBIOS - Second Hard Disk user defined: # Cylinders, High Byte
----------R24--------------------------------
CMOS 24h - AMSTRAD - INITIAL VDU CHARACTER ATTRIBUTE
Note: default: 7h
----------R24--------------------------------
CMOS 24h - PHOENIX - First user defined hard disk (type 48) Write Precomp. MSB
----------R24--------------------------------
CMOS 24h - AWARD - 2nd Hard Disk user defined (type 48): Landing Zone High Byte
----------R24--------------------------------
CMOS 24h - Quadtel HT 12 BIOS - SECOND USER DEFINED DRIVE
SeeAlso: CMOS 1Eh"Quadtel",#C0024
----------R25--------------------------------
CMOS 25h - AMI - Second Hard Disk user defined: # of Cylinders, High Byte
----------R25--------------------------------
CMOS 25h - AMI WinBIOS - Second Hard Disk user defined: Number of Heads
----------R25--------------------------------
CMOS 25h - AMSTRAD - size of RAM disk in 2K blocks
Note:	default: 0  - only used by the RAMDISK software supplied.
----------R25--------------------------------
CMOS 25h - PHOENIX - First user defined hard disk (type 48) Parking zone LSB
----------R25--------------------------------
CMOS 25h - AWARD - 2nd Hard Disk user defined (type 48): Sectors per Track
----------R25--------------------------------
CMOS 25h - Quadtel HT 12 BIOS - second user def. drive: WPC-low
Desc:	Write Precompensation Cylinder, low byte
----------R26--------------------------------
CMOS 26h - AMI - Second Hard Disk user defined: Number of Heads
----------R26--------------------------------
CMOS 26h - AMI WinBIOS - Second Hard Disk user defined: WPC-low
Desc:	Write Precompensation Cylinder, Low Byte
----------R26--------------------------------
CMOS 26h - AMSTRAD - INITIAL SYSTEM UART SETUP BYTE
Note:	default: E3h - format as for Int 14h fn 0
----------R26--------------------------------
CMOS 26h - PHOENIX - First user defined hard disk (type 48) Parking zone MSB
----------R26--------------------------------
CMOS 26h - AWARD - 1st Hard Disk user defined (type 49): # Cylinders, Low Byte
----------R26--------------------------------
CMOS 26h - Quadtel HT 12 BIOS - SECOND USER DEFINED DRIVE
SeeAlso: CMOS 20h"Quadtel",#C0026
----------R27--------------------------------
CMOS 27h - AMI - Second Hard Disk user defined: WPC-low
Desc:	Write Precompensation Cylinder, Low Byte
----------R27--------------------------------
CMOS 27h - AMI WinBIOS - Second Hard Disk user defined: WPC-high
Desc:	Write Precompensation Cylinder, High Byte
----------R27--------------------------------
CMOS 27h - AMSTRAD - INITIAL EXTERNAL UART SETUP BYTE
Note:	default: E3h - format as for Int 14h fn 0
----------R27--------------------------------
CMOS 27h - PHOENIX - First user defined hard disk (type 48) Sectors per track
----------R27--------------------------------
CMOS 27h - AWARD - 1st Hard Disk user defined (type 49): # Cylinders, High Byte
----------R27--------------------------------
CMOS 27h - Quadtel HT 12 BIOS - SECOND USER DEF. DRIVE: landing zone low byte
----------R28--------------------------------
CMOS 28h - AMI - Second Hard Disk user defined: WPC-high
Desc:	Write Precompensation Cylinder, High Byte
----------R28--------------------------------
CMOS 28h - AMI WinBIOS - Second Hard Disk user defined: Landing Zone, Low Byte
----------R28--------------------------------
CMOS 28h - HP Vectra - checksum over bytes 29h-2Dh
----------R28--------------------------------
CMOS 28h - AWARD - 1st Hard Disk user defined (type 49): Number of Heads
----------R28--------------------------------
CMOS 28h - Quadtel HT 12 BIOS - second user def. drive: sectors per track
----------R283F------------------------------
CMOS 28h-3Fh - AMSTRAD - user applications default: zeroes
----------R29--------------------------------
CMOS 29h - AMI - Second Hard Disk user defined: Control Byte
Note:	80h if # of heads is equal or greater than 8
----------R29--------------------------------
CMOS 29h - AMI WinBIOS - Second Hard Disk user defined: Landing Zone, High Byte
----------R29--------------------------------
CMOS 29h - PHOENIX - LSB word to Intel 82335 CC0 compare register
----------R29--------------------------------
CMOS 29h - AWARD - 1st Hard Disk user defined (type 49): Write Precomp Low Byte
----------R29--------------------------------
CMOS 29h - HP Vectra - OFFICIALLY RESERVED "CMOS_HPCONFIG"

Bitfields for HP Vectra CMOS_HPCONFIG:
Bit(s)	Description	(Table C0028)
 7	include byte 2Ch in checksum (default = 0)
 6	select second ROM video adapter as primary (default = 0)
 5-1	reserved
 0	manufacturing test enabled
----------R2A--------------------------------
CMOS 2Ah - AMI - Second Hard Disk user defined: Landing Zone, Low Byte
----------R2A--------------------------------
CMOS 2Ah - AMI WinBIOS - Second Hard Disk user defined: # of Sectors per track
----------R2A--------------------------------
CMOS 2Ah - HP Vectra - OFFICIALLY RESERVED
----------R2A--------------------------------
CMOS 2Ah - PHOENIX - MSB word to Intel 82335 CC0 compare register
----------R2A--------------------------------
CMOS 2Ah - AWARD - 1st Hard Disk user defined (type 49): Write Precomp High
----------R2B--------------------------------
CMOS 2Bh - AMI - Second Hard Disk user defined: Landing Zone, High Byte
----------R2B--------------------------------
CMOS 2Bh - AMI WinBIOS - IDE and shadowing control

Bitfields for AMI WinBIOS IDE/shadowing control:
Bit(s)	Description	(Table C0029)
 7	LBA mode enabled
 6	IDE block mode enabled
 5	32-bit transfer enabled
 4	unused
 3	shadowing of DC00h enabled
 2	shadowing of D800h enabled
 1	shadowing of D400h enabled
 0	shadowing of D000h enabled
SeeAlso: #C0030
----------R2B--------------------------------
CMOS 2Bh - HP Vectra - OFFICIALLY RESERVED
----------R2B--------------------------------
CMOS 2Bh - PHOENIX - LSB word to Intel 82335 CC1 compare register
----------R2B--------------------------------
CMOS 2Bh - AWARD - 1st Hard Disk user defined (type 49): Landing Zone  Low Byte
----------R2C--------------------------------
CMOS 2Ch - AMI - Second Hard Disk user defined: # of Sectors per track
----------R2C--------------------------------
CMOS 2Ch - AMI WinBIOS - CACHE CONTROL

Bitfields for AMI WinBIOS cache control:
Bit(s)	Description	(Table C0030)
 7	external RAM cache enabled
 6	internal RAM cache enabled
 5	shadowing of E000h enabled
 4	shadowing of CC00h enabled
 3	shadowing of C800h enabled
 2	shadowing of C400h (video ROM) enabled
 1	shadowing of C000h (video ROM) enabled
 0	shadowing of system BIOS (F000h, 64K) enabled
SeeAlso: #C0029
----------R2C--------------------------------
CMOS 2Ch - HP Vectra - OFFICIALLY RESERVED
----------R2C--------------------------------
CMOS 2Ch - COMPAQ - NumLock CONTROL

Bitfields for Compaq NumLock control:
Bit(s)	Description	(Table C0031)
 6	0 - numlock OFF on boot, 1 - numlock ON at boot
----------R2C--------------------------------
CMOS 2Ch - PHOENIX - MSB word to Intel 82335 CC1 compare register
----------R2C--------------------------------
CMOS 2Ch - AWARD - 1st Hard Disk user defined (type 49): Landing Zone High Byte
----------R2D--------------------------------
CMOS 2Dh - AMI Hi-Flex BIOS - CONFIGURATION OPTIONS 

Bitfields for AMI Hi-Flex BIOS configuration options:
Bit(s)	Description	(Table C0032)
 7	Weitek Installed
 6	Floppy Drive Seek - turn off for fast boot
 5	Boot Order
	0 - Drive C:, then A:
	1 - Drive A:, then C:
 4	Boot Speed (0 - Low; 1 - High)
 3	External Cache Enable (1 = On)
 2	Internal Cache Enable (1 = On)
 1	Use Fast Gate A20 after boot (1 = On)
 0	Turbo Switch (1 = On)
----------R2D--------------------------------
CMOS 2Dh - AMI WinBIOS - flags

Bitfields for AMI WinBIOS flags:
Bit(s)	Description	(Table C0033)
 7	Weitek Installed
 6	bootsector virus protection enabled
 5	mouse enabled
 4	password checking (0 setup, 1 always)
 3	parity error check enabled
 2-1	boot order (00 = C:A:, 01 = A:C:)
 0	turbo switch enabled
----------R2D--------------------------------
CMOS 2Dh - HP Vectra - OFFICIALLY RESERVED
----------R2D--------------------------------
CMOS 2Dh - PHOENIX - ???
Note:	checks for values AAh or CCh
----------R2D--------------------------------
CMOS 2Dh - AWARD - 1st Hard Disk user defined (type 49): Sectors per Track
----------R2E--------------------------------
CMOS 2Eh - IBM - Standard CMOS Checksum, High Byte
----------R2F--------------------------------
CMOS 2Fh - IBM - Standard CMOS Checksum, Low Byte

 2Eh and 2Fh are as defined by the original IBM PC/AT specification and
 represent a byte-wise additive sum of the values in locations 10h-2Dh only,
 00h-0Fh and 30h-33h are not included. This definition is used by most
 clone manufacturers including AMI, Compaq, Tandon, NEC, and Zenith. The 
 IBM PS/2 line does not follow this standard with the range 19h-31h being 
 undefined.  On the original HP Vectra, this checksum only covers locations
 10h to 20h, with a separate checksum for bytes 29h-2Ch (see offset 28h).

----------R30--------------------------------
CMOS 30h - IBM - EXTENDED MEMORY IN KB (low byte)
SeeAlso: CMOS 17h"IBM",CMOS 31h
----------R31--------------------------------
CMOS 31h - IBM - EXTENDED MEMORY IN KB (high byte) 
 (this appears to mirror the value in bytes 17h-18h.) 
SeeAlso: CMOS 18h"IBM",CMOS 30h
----------R32--------------------------------
CMOS 32h - IBM - CENTURY BYTE (BCD value for the century - currently 19h)
SeeAlso: CMOS 7Fh
----------R32--------------------------------
CMOS 32h - IBM PS2 - CONFIGURATION CRC LOW BYTE
Desc:	CRC for range 10h-31h
SeeAlso: CMOS 33h"PS/2"
----------R33--------------------------------
CMOS 33h - IBM - INFORMATION FLAG

Bitfields for IBM information flag:
Bit(s)	Description	(Table C0034)
 7	128K ??? believe this indicates the presence of the special 128k
	  memory expansion board for the AT to boost the "stock" 512k
	  to 640k - all machines surveyed have this bit set)
 6-0	???
----------R33--------------------------------
CMOS 33h - IBM PS/2 - CONFIGURATION CRC HIGH BYTE (see entry for 32h)
SeeAlso: CMOS 32h"PS/2"
----------R33--------------------------------
CMOS 33h - PHOENIX - Bit 4 (000x 0000) bit 4 from Intel CPU register CR0
----------R33--------------------------------
CMOS 33h - AMI WinBIOS - INFORMATION FLAGS

Bitfields for AMI WinBIOS information flags:
Bit(s)	Description	(Table C0035)
 7	IBM-defined top 128K present
 6-4	CPU internal clock frequency
	000-011 = 25, 33, 40, 50 MHz
	100 = 60/66 MHz
	101 = 75 MHz
	110 = 80 MHz
	111 = 90/100 MHz
 2-1	CPU internal clock multiplier
	00-11 = 1,2,3,4
 0	FlashROM programming enabled (Ctrl-Home pressed at power on)
	Note: this location is not included in any CMOS checksum fields
----------R33--------------------------------
CMOS 33h - Quadtel HT12 BIOS 03.05.03 - INFORMATION FLAGS

Bitfields for Quadtel HT12 information flags:
Bit(s)	Description	(Table C0036)
 7	640K RAM present
 6	extension type (=CPU's Machine Status Word)
 1	print welcome message
----------R34--------------------------------
CMOS 34h - AMI - SHADOWING & BOOT PASSWORD
SeeAlso: CMOS 35h"AMI"

Bitfields for AMI shadowing control 1:
Bit(s)	Description	(Table C0037)
 7-6	password selection
	00b Disable
	10b Reserved
	01b Set
	11b Boot
 5	C8000h Shadow ROM (Bit 1 = On) 
 4	CC000h Shadow ROM (Bit 1 = On)
 3	D0000h Shadow ROM (Bit 1 = On)
 2	D4000h Shadow ROM (Bit 1 = On)
 1	D8000h Shadow ROM (Bit 1 = On)
 0	DC000h Shadow ROM (Bit 1 = On)
SeeAlso: #C0038
----------R34--------------------------------
CMOS 34h - AMI - EXTENDED MEMORY >16M (low byte)
Note:	this and the following byte contain the total extended memory in 64K
	  blocks
SeeAlso: CMOS 35h"AMI"
----------R34--------------------------------