mmachlis@athena.mit.edu (Matthew A Machlis) (06/13/90)
Has anyone experienced a failure of the floating point coprocessor on an IRIS 3000-series? Ours suddenly stopped working, and now all programs compiled with the -Zf option do not work. It has been getting a little warm in the computer room because the air conditioner wasn't working correctly -- could this have something to do with it? Any info would be appreciated.
fsfacca@AVELON.LERC.NASA.GOV (Tony Facca) (06/13/90)
Subject: 3020 Floating Point Coprocessor Failure >Has anyone experienced a failure of the floating point coprocessor on an >IRIS 3000-series? Ours suddenly stopped working, and now all programs compiled >with the -Zf option do not work. It has been getting a little warm in the >computer room because the air conditioner wasn't working correctly -- could >this have something to do with it? Any info would be appreciated. > Well as a matter of fact, even as we "speak", I have the service guys sitting in the computer room swapping out our floating point board. It's the first one to go in a couple of years, and we just rolled the machine down the hall to a new room (which is about 20 degrees cooler). But, it's a simple board swap (at least it was when SGI had the service contract), now it's still a simple board swap, it just takes a lot longer for the service guys to believe me.. :-) Try this program (f77 -Zg fpu.f -o fpu). If the answers are wrong, get a new board. --------------------------------- fpu.f -------------------------------------- program fpu c *** test the floating point processor board c *** compile program: f77 -Zg fpu.f -o fpu c *** these functions invoke the floating point accellerator. If the c *** board is bad, the results will be incorrect, but the integers c *** will be correct. do 100 i = 1, 20 x = float (i) cosx = cos(x) sinx = sin(x) print *,'integer: ',i,' x= ',x,' cosx= ',cosx,' sinx= ',sinx 100 continue stop ' ** end test **' end ------------------------------------------------------------------------------- -- ..ahead, warp factor...two + * + * + * - - - - -------======<<<<<{{{{{{[[[[[[ TONY FACCA fsfacca@avelon.lerc.nasa.gov + + * * *