Chapter 2 – Installation
2-4
Register 219h – LED/BIOS Port
Table Chapter 2 -3 describes the LEDs and signals that register 219 controls.
Table Chapter 2 -3. LED/BIOS Port
Bit
LED/Signal
Result
R/W
0
FAULT
1 = Fault LED off
0 = Fault LED on
R/W
1
PASS
1 = PASS LED on
0 = PASS LED off
R/W
2
FLASHWR
1 = Flash write enabled/A18 enable
R/W
3
FLB-A18
Flash BIOS Address A18; when FLASHWR = 0
reads switch position 6
R
4
Reserved
0
R/W
5
BIOS_C8
1 = Enable C8000h-CFFFFh on-board BIOS
R/W
6
BIOS_D0
1 = Enable D0000h - D7FFFh on-board BIOS
R/W
7
BIOS_D8
1 = Enable D8000h - DFFFFh on-board BIOS
R/W
Register 218h – TEMP/Abort Port
This register controls the temperature sensor and the abort toggle switch. It also allows
you to read the CMOS clear switch and VGA enable.
Table Chapter 2 -4. Temp/Abort Port
Bit
Signal
Result
R/W
0
TS_RESET
0 = Reset temperature sensor interface
R/W
1
TS_WRITE
Write data bit must be high when reading
temperature sensor
R/W
2
TS_DQ
Temperature sensor read data bit
R
3
TS_CLK
A low to high will clock in or clock out bit
R/W
4
ABORT_STS
1 = Abort toggle switch caused interrupt
R
5
ABORT_CLR
1 = Enable abort
0 = Clear and disable abort
R/W
6
VGA_EN
1 = On-board VGA controller enabled
R
7
CLRCMOS
1 = CMOS okay
0 = Clear CMOS
R
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