-16- MBM-530NS User’s Manual
1.4 Interrupt Controller
The equivalent of two 8259 Programmable Interrupt Controllers (P IC) are
included on the MBM-530NS board. They accept requests from peripherals,
resolve priorities on pending interrupts in service, issue interrupt requests to
the CPU, and provide vectors which are used as acceptance indices by the
CPU to determine which interrupt service routine to execute. These two
controllers are cascaded with the second controller representing IRQ8 to
IRQ15, which is rerouted through IRQ2 on the first controller.
The following is the system information of interrupts levels:
IRQ8
: Real time clock
IRQ9
: Serial port 4
IRQ10
: LAN adapter
IRQ11
: Serial port 3
IRQ12
: Reserved for PS/2 mouse
IRQ13
: Math. coprocessor
IRQ14
: Hard disk adapter
IRQ15
: Reserved for Serial port 5
In
Interrupt Level
NMI
CTRL1
IRQ 0
IRQ 1
IRQ
2
IRQ 3
IRQ 4
IRQ 5
IRQ 6
IRQ 7
CTRL2
Parity check
Description
Serial port 2
Serial port 1
Parallel port 2
Floppy disk adapter
Parallel port 1
System timer interrupt from timer 8254
Keyboard output buffer full
Rerouting to IRQ8 to IRQ15
Summary of Contents for MBM-530NS
Page 1: ...MBM 530NS User s Manual...
Page 4: ...4 MBM 530NS User s Manual...
Page 8: ......
Page 12: ......
Page 58: ......
Page 91: ...Web site www formosa21 com MBM 530NS User s Manual 91 when user tries to enter Setup utility...
Page 96: ......