The interrupt service routine can then run specific display or graphics software to modify data in the video home computers and video game consoles that relied upon a central microprocessor to generate text or graphic displays.
32.
The first word of the interrupt vector contains the address of the interrupt service routine and the second word the value to be loaded into the PSW ( priority level ) on entry to the service routine.
33.
The first word of the interrupt vector contains the address of the interrupt service routine and the second word the value to be loaded into the PSW ( priority level ) on entry to the service routine.
34.
The stored address is called before or after the TSR has received the interrupt and has finished its processing, in effect forming a singly linked list of interrupt handlers, also called " interrupt service routines ", or ISRs.
35.
The OS jumps through VVBLKI ( $ 0222 hex / 546 dec ) to begin the OS VBI Service Routine, and the OS VBI Routine exits with a jump through VVBLKD ( $ 0224 hex / 548 dec ).
36.
For example, a function could be wrapped all around with a mutex ( which avoids problems in multithreading environments ), but if that function is used in an interrupt service routine, it could starve waiting for the first execution to release the mutex.
37.
For a device at BR6, the new PSW in its vector would typically specify 6 as the new processor priority, so the processor would honor more urgent requests ( BR7 ) during the service routine, but defer requests of the same or lower priority.
38.
While in principle an extremely short interrupt handler could be stored entirely inside the interrupt vector table, in practice the code at each and every entry is " JMP address " where the address is the address of the interrupt service routine ( ISR ) for that interrupt.
39.
Memory in page 0 is at a premium, since variables placed here can be addressed directly from any page . ( Moreover, address 0000 is where any interrupt service routine must start, and addresses 0010 0017 have the special property of auto-incrementing preceding any indirect reference through them .)
40.
This makes it much easier to write device drivers that involve complex state machines, such as those for memory sticks or USB . Interrupts are handled with an interrupt service routine, which may request an " immediate deferred function call " ( called as soon as the interrupts are processed ), or a " deferred function call ", which is queued to run on a kernel thread.
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