Path: utzoo!attcan!utgpu!watmath!att!dptg!rutgers!njin!princeton!udel!udccvax1!friday From: friday@vax1.acs.udel.EDU (Thomas A Mcdonald) Newsgroups: comp.sys.apple Subject: Interrupts Message-ID: <4130@udccvax1.acs.udel.EDU> Date: 9 Aug 89 03:49:21 GMT Reply-To: friday@vax1.acs.udel.EDU (Thomas A Mcdonald) Distribution: na Organization: University of Delaware Lines: 18 I am having trouble with handling serial port interrupts on my Apple IIgs. Every time I enable the serial port interrupts, the system freezes when the interrupt occurs. I patched in to the IRQ.SERIAL vector (using the Misc. tool set), but it seems as if the interrupt handler isn't passing control to the serial port handling routine. I even set up a dummy routine that would write a value to specific memory location if a SCC interupt occured, but it never reached my routine (I know the routine works because I set it up in IRQ.FLUSH vector and it worked fine). Any ideas? Tom (I even patched into IRQ.APTALK to make sure the Appletalk routine wasn't trying to handle it).