giacobbe@pilot.njin.net (Jeff Giacobbe) (02/22/90)
The following question is (I think) both a hardware and software one. Here at the college (Montclair State) we offer on operating systems class that uses a DEC Micro Vax and four PDP/11's. The students write their code on the MicroVax, then upload it to the PDP/11's for execution, etc,etc,etc. This system works fine for single-process programs. HOWEVER, when trying to run code that uses concurrent processing, the system reports back that the PDP/11's clock(s) is disabled. We had DEC field-service out here the other day. He checked all the jumpers and connections on the PDP/11's and, as expected, everything looked in it's proper place. This led me to believe that it was a software problem; i.e. there was some missing code that would turn on the PDP/11's clock and provide the interrupts necessary to run the concurrent processes. The professors who have taught the class in the past tried out their older concurrent-process programs that USED TO work. Same thing: the dreaded 'clock disabled' message. So that's the situation, DEC field service says the hardware is configured correctly and that it must be the software, the professors say their programs worked before, so it must be a hardware problem! Any help and/or suggestions would be GREATLY appreciated. Thanks, Jeff Giacobbe giacobbe@apollo.montclair.edu OR giacobbe.pilot.njin.net