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