Title: | AMIGA NOTES |
Notice: | Join us in the *NEW* conference - HYDRA::AMIGA_V2 |
Moderator: | HYDRA::MOORE |
Created: | Sat Apr 26 1986 |
Last Modified: | Wed Feb 05 1992 |
Last Successful Update: | Fri Jun 06 1997 |
Number of topics: | 5378 |
Total number of notes: | 38326 |
Help!!! I'm having a strange problem that I hope someone can help me with. I have an A1000 on which I have been running a 1 Meg Starboard2 for about a year. About three months ago I added a C Ltd SCSI 1000 host/controller board with an ST-412 and Q504 disks connected through an Adaptec 4000 controller. For about three months, this system ran perfectly without any problems. Recently, I began to get the following GURU: 00000004.00200ED2 The system boots up perfectly, runs for awhile, then crashes with the above number. I have found that I can *always* get the machine to crash if I run AZComm or VT100 and log in somewhere. The machine will always crash (again, with the same number) after about a screenful's worth of data. I experimented with different versions of Kickstart/Workbench (1.2, 1.3), not loading the SCSI driver software, loading programs from floppy, etc. All gave the same results. Finally, I discovered that if I leave *only* the Starboard2 or *only* the SCSI host/controller attached to the Amiga, the system will run fine! It is only when I have both simultaneously connected that the machine consistently crashes. So I have the following questions: - it seems obvious that my problem has to do with the expansion bus, but it isn't obvious to me if it is caused by overloading the data/ address lines or the power supply; how do I tell? - what is it about using the serial port (via VT100 or AZComm) that causes my crash to occur so "reliably"? - why did the system run perfectly for months, then begin to fail consistently Many thanks for any help anyone can offer!
T.R | Title | User | Personal Name | Date | Lines |
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1808.1 | P/S? | RAVEN1::EVERHART | Mon Oct 24 1988 12:55 | 20 | |
Maybe this will help: Error #4 is an illegal instruction error. This is possibly caused by a failing power supply that is unable to refresh the memory properly. (Someone correct me if I'm wrong) Your power supply may be just powerful enough to handle both boards without anything extra going on, but the serial port requires power too. That could be just enough to do it. Since this worked previously, it is puzzling, but keep in mind that power supplies age too. If you've ever looked inside a computer after a year or two of use, You'll notice that some of the chips have started to melt. It is possible that the tolerances on the parts in you power supply have changed. My suggestion is that you take You hardware to a friend who also has a 1000, but has not used such extra devices, and see if you can get it to run on his. You may end up buying an external power supply, but PLEASE, don't take my word for it. Test it first. - Chris P.S. These are only guesses. I hope they help. | |||||
1808.2 | YES! | VTHRAX::KIP | G.M. Landingham 293-5297 | Mon Oct 24 1988 21:38 | 5 |
Dug out Volume 3, Number 3 of Amazing Computing and found Perry's Kivolowitz's article about grounding the daughterboard PALs. Did this...problem is solved! Thanks for the help. |