Publication No. HRMCR11 Rev. B.0
About This Manual 45
the operating system. The I/0 APIC handles interr
u
pts very differently than the
8259. Briefly
,
these differences are:
• 1\Iethocl of Interrupt Transmission. The I/0 APIC tran
s
mit
s
interrupts
through a three wire b
u
s
,
and interrupts are handled witho
u
t need for the
processor to run an interrupt acknowledge
cy
cle
.
• Intenupt P1iority. The priority of interrupts in the I/0 APIC is independent
of the i
n
terrup
t
number. For example
,
interrupt 10 way be given a higher
priority than interrupt 3
.
• 1\Iore Interrupts. The I/0 APIC in the Intel 63
00
ES
B
supports a total of 48
interrupts.
For a complete operation descriptions please refer to the 'Intel 6300ESB I/0
Controller Hub
'
data
s
h
eet
.
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