Interrupts; Maskable Interrupts; User Interface To The Interrupt System - Commodore Amiga Hardware Reference Manual

Interrupts
This system :supports the full range of 68000 processor interrupts. The various kinds of
interrupts generated by the hardware are brought into the peripherals chip and are
translated into six of the seven available interrupts of the 68000.
NO NMAS KABLE INTERRUPT
Interrupt level 7 is the nonmaskable interrupt and is not generated anywhere in the
current system. The raw interrupt lines of the 68000, IPL2 through IPLO, are brought
out to the expansion connector and can be used to generate this level 7 interrupt for
. debugging purposes.
MAS KABLE INTERRUPTS
Interrupt levels 1 through 6 are generated. Control registers within the peripherals chip
allow you to mask certain of these sources and prevent them from generating a 68000
interrupt.
USER INTERFACE TO THE INTERRUPT SYSTEM
The system software has been designed to correctly handle all system hardware inter-
rupts at levels 1 through 6. A separate set of input lines, designated INT2* and INT6*
1
have been routed to the expansion connector for use by external hardware for interrupts.
These are known as the external low- and external high-level interrupts.
These interrupt lines are connected to the peripherals chip and create interrupt levels 2
and 6, respectively. It is recommended that you take advantage of the interrupt
handlers built into the operating system by using these external interrupt lines rather
than generating interrupts directly on the processor interrupt lines.
1
A
*
indicates an active low signal.
System Control Hardware 207