| 1. | The lowest vectors are service routines to handle various types of trap.
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| 2. | One feature of the 8051 core is the inclusion of a interrupt service routine.
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| 3. | These pins generate interrupts to the controller, which then executes an interrupt service routine.
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| 4. | Each and every entry of the IVT is the address of an interrupt service routine.
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| 5. | SRB's represent requests to execute a system service routine.
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| 6. | With the new PC, the processor jumped to the service routine for the interrupting device.
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| 7. | The value of the stack pointer can be checked at the start of the interrupt service routine.
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| 8. | The copy will therefore continue from where it left off when the interrupt service routine returns control.
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| 9. | TRSDOS then fetched from a table the absolute address of the needed service routine and branched to it.
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| 10. | John Everett wrote the disk handler, file system, TTY ( teletypewriter ) handler and 680-I service routine for TSS-8.
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