man@cs.brown.edu (Mark H. Nodine) (08/22/90)
Ever since I upgraded my Mac 512Ke+2Meg memory to System 6.0.5 (I'm using the XPRAM init, so that's not the problem), I've been having problems with occasional system hangs. I've traced the problem in MacsBug to the code in the SCSI manager that implements the opcode scInc (I don't know anything about SCSI). The code around where the hang occurs looks like MOVE.B D7,$20(A4) <--------- MOVEQ #-$01,D1 | MOVE.B #$01,$20(A4) | BTST #$06,$10(A3) | DBNE D1 | BNE.S *+$A ------------ | MOVE.B D7,$20(A4) | | MOVEQ #$03,D0 | | BRA.S *+$2C -------- | | MOVEQ #$30,D0 <----+--- | >>> DBF D0 | | BTST #$5,$10(A3) | | BNE.S *-$2C -------+------- | V During execution, A3=$580000 and A4=$580003. The ">>>" indicates where the PC usually is when I break into the debugger during a hang. The code seems to be called about every 2 seconds when there is nothing in the SCSI unit (it's a cartridge drive) and only during disk I/O when there is something there. Any idea what could be the cause of this hang? Do I have a faulty SCSI port? Or is there some incompatibility with System 6.0.5? --Mark
thisted@galton.uchicago.edu (Ronald A. Thisted) (08/22/90)
In article <47848@brunix.UUCP> man@cs.brown.edu (Mark H. Nodine) writes: >Ever since I upgraded my Mac 512Ke+2Meg memory to System 6.0.5 (I'm >using the XPRAM init, so that's not the problem), I've been having >problems with occasional system hangs. I've traced the problem in >MacsBug to the code in the SCSI manager that implements the opcode >scInc (I don't know anything about SCSI). > > [Description of code omitted] > >Any idea what could be the cause of this hang? Do I have a faulty >SCSI port? Or is there some incompatibility with System 6.0.5? > I have had a similar problem with a newly purchased IIci (running 6.0.5, of course). The IIci has an internal hard disk. I hooked up my old Jasmine DD100 to the SCSI port. Whenever the Jasmine is turned on, the IIci fails to boot (chimes, sad mac, x0F x01). When the Jasmine is off, booting is fine. After initial booting, the DD100 can be powered up, and sometimes can be mounted successfully. Sometimes, the machine hangs after the DD100 icon shows up on the desktop. Any clues would be appreciated. Ronald Thisted University of Chicago Ron Thisted Department of Statistics/The University of Chicago thisted@galton.uchicago.edu
boerned@mist.CS.ORST.EDU (Dan Boerner) (08/26/90)
To the original poster: A while back (18 months) I had a similar SCSI prob with my Mac 128->mac 512KE ->2 meg + Dove SCSI board. It came down to a bug in the SCSI adapter board from Dove. Dove was kind enough to send me a resister clip that fixed the prob. I'm assuming you've got a non-apple SCSI adapter, if it's a Dove one then give them a call. Hope this helps some. Dan Boerner Phd Student, Oregon State University boerend@mist.cs.orst.edu
urlichs@smurf.sub.org (Matthias Urlichs) (08/27/90)
In comp.sys.mac.system, article <1990Aug22.144829.10562@midway.uchicago.edu>,
thisted@galton.uchicago.edu (Ronald A. Thisted) writes:
<
< [...] I hooked up
< my old Jasmine DD100 to the SCSI port. Whenever the Jasmine is turned
< on, the IIci fails to boot (chimes, sad mac, x0F x01). When the
The formatter of that Jasmine does some very nonstandard things like directly
accessing the SCSI chip of your MacPlus, which happens not to work on a
IIci. ;-)
Either patch the Apple HD Setup program to work with your Jasmine, or go and
buy SilverLining. (I'd do the latter if I were you.)
--
Matthias Urlichs -- urlichs@smurf.sub.org -- urlichs@smurf.ira.uka.de
Humboldtstrasse 7 - 7500 Karlsruhe 1 - FRG -- +49+721+621127(Voice)/621227(PEP)pip@pro-freedom.cts.com (David Pipgras) (08/29/90)
In-Reply-To: message from urlichs@smurf.sub.org I also have to reccomend Silverlining Software! It is well worth the price! Dave UUCP: .. !crash!pro-freedom!pip ARPA: crash!pro-freedom!pip@nosc.mil INET: pip@pro-freedom.cts.com