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Interrupts
Three interrupts lines are provided to the system. The interrupt level (9, 10, or 11) is selected by
placing the appropriate switch on switch bank one to the on position. Interrupt levels 9, 10, and 11
are shared interrupts. An interrupt register (read address n237, where n is the first digit of address
range) is provided to store pending port interrupts. Interrupt register bit assignment as shown in
Figure 8.
Hex Address n237
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
1
1
0
1
0
Figure 8.
Interrupt Register Read Format
The reset or enable for interrupt level 9 is hex address 02F2.
The reset or enable for interrupt level 1 0 is hex address 06F2.
The reset or enable for interrupt level 11 is hex address 06F3.
8
5080 Peripheral Adapter
Bit 2
Bit 1
Bit 0
Port 3
Port 2
Port 1
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