🚀 go-pugleaf

This is a request for help. We have encountered the following problem we
are not able to solve: We use 50 MHz 486 EISA computer with SCO UNIX V
Release 3.2 Ver 4.1. The hard disk (SCSI-2) is connected through EISA
adapter Adaptec AHA-1742A. 
 
Everything worked fine until we tried to connect streamer unit (QIC 
streamer Wangtek 5150 ES). Unfortunately, this attempt was not succesful. 
We can move the tape (via 'tape' command) and even write backup (cpio,
tar). But, any attempt to *READ* the tape hangs the SCSI adapter. After
short movement of the tape the diagnostic LED on the adapter lights on 
and remains so and any device connected to the SCSI adapter becomes 
unavailable until the computer is reset.
 
We made several experiments, using also simplier ISA SCSI adapter
Adaptec 1542B, which we had available. We can summarize the results
as follows:
 
1. Adaptec 1742 hangs in both enhanced and standard (1542-emulating)
   mode.
 
2. If we replace 1742 by Adaptec 1542, everything works fine. (I guess
   this proves that the problem is not in the SW, because the drivers are
   exactly same as with 1742 in standard mode).
 
3. If we use both adapters, the HD connected to 1542 and the tape to 1742,
   an attempt to read the tape blocks the task which tried it, but the
   rest of the UNIX system continues to run without problem. The blocked
   task cannot be terminated.
 
4. We thought there might be a problem between SCSI-1 (tape) and SCSI-2
   (HD and Adaptec 1742). We tried to connect insted of the tape another
   HD (SCSI-1), but this worked without problems.
 
5. Having two similar machines we tried to swap Adaptec 1742 adapters
   and Wangtek streamers. The problem occured with any of the adapters
   and streamers - it is not simply one bad piece of hardware.
 
Please, if you have any ideas or suggestions how to solve this problem,
post them to this group or directly to my e-mail address.
 
Thanx, V. Lieberzeit
 
 
P.S. BTW, we had also problems with EISA configuration program from 
AMI. When saving the configuration of Adaptec-1742 slot, the program 
hangs. It does so even when run in "remote" mode on other computer, 
saving the configuration only to file (which IMHO means, that the problem
is in the SW). According to our experiments the problem is in the overlay
file supplied by the Adaptec (ADP0000.OVR). Have any of you experienced 
this problem ?
 
 
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Vladimir Lieberzeit                      Internet: lieberzeit@cs.felk.cvut.cs
Department of Computers                  Bitnet: LIEBER@CSEARN
Czech University of Technology, Prague   Tel: +42 (2) 68 34 400
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