11/3/71 SYS INTR (II)





11/3/71                                             SYS INTR (II)





NAME            intr  --  set interrupt handling



SYNOPSIS        sys     intr; arg       / intr = 27.



DESCRIPTION     When arg is 0, interrupts (ASCII DELETE) are ig-

                nored.  When arg is 1, interrupts cause their

                normal result, that is, force an exit.  When arg

                is a location within the program, control is

                transferred to that location when an interrupt

                occurs.



                After an interrupt is caught, it is possible to

                resume execution by means of an rti instruction;

                however, great care must be exercised, since all

                I/O is terminated abruptly upon an interrupt.  In

                particular, reads of the typewriter tend to re-

                turn with 0 characters read, thus simulating an

                end of file.



FILES           --



SEE ALSO        quit



DIAGNOSTICS     --



BUGS            It should be easier to resume after an interupt,

                but I don't know how to make it work.



OWNER           ken, dmr
squoze.net
