hauerwas@hvrunix.UUCP (03/02/87)
The following is a message from the Vax System Manager here at Haverford. I'm posting it to the groups I think might know how to deal with it. Please respond through E-Mail to either "hauerwas!hvrunix" or "A_HAUERWAS @ HVRFORD.BITNET" Thanks in advance. * * * I am trying to write a driver for the COM port on an AT&T 6300+ with the OS Merge operating system. I am able to address the chip ports and can send single characters out on the line (a line monitor has verified this). However, I am unable to receive interrupts. The chip is posting the interrupts but somehow they are getting masked out. I am running on interrupt 4 (the default driver has been removed). When I read the 8259 (PIC) enable register I get a value of 13 which means that only interrupts 0, 2, and 3 are enabled. I enable interrupt 4 and read the register which gives a value of 29 (as it should). However, on the very next instruction I read the register again and the value has returned to 13. Any ideas? Bob Kostes Systems Manager Haverford College Posted by: -- Adam J. Hauerwas (Wonko the Sane) Assistant Vax System Manager A_Hauerwas @ Hvrford.Bitnet Haverford College hauerwas!hvrunix Haverford, PA 19041-1392