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This is the inside of a Mac IIci.  This chip is corroded.  I don't know what this chip is, or what it does.  Can someone enlighten me?

IIciChip.JPG

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That looks more like sticker residue or dirt to me, because the pins are all still shiny.  That's the CPU, so if it's bad, things really won't work.

 

I would try wiping that off with some rubbing alcohol on a paper towel.

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Thank you.  I had a talent for swapping out hard drives, so now it is my job to try to fix all of the computers when things go wrong.  As you can tell, I don't really know as much as I need to know to do this.  This IIci is acting a little odd.  I have a different one that is all clean and shiny that may get swapped out, but now I know something now that I didn't know before.

 

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Is the little chunk missing out of the top side normal?  I hate pulling the power supplies, so I really don't want to yank it out of the other so I can see the CPU.

closeup.jpg

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8 hours ago, Iamanamma said:

This IIci is acting a little odd

I stand to be corrected here, but if the CPU were noticeably damaged, I'd expect rather worse than 'acting a little odd'

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8 hours ago, cheesestraws said:

I stand to be corrected here, but if the CPU were noticeably damaged, I'd expect rather worse than 'acting a little odd'

Okay, you are much more experienced than I, so I believe you.  I am going to be checking for software issues.  It had a SCSI2SD installed in it, but I didn't do the install.  I am wondering if something semi important was missed when the OS and PAC software were installed.  I just saw that gunky chip when I had to pull the power supply to get at the floppy drive, and figured asking questions was not a bad idea.

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8 hours ago, Iamanamma said:

asking questions was not a bad idea

asking questions is almost never a bad idea, especially when you want to know about systems you're relying on :-).  I didn't mean to sound at all dismissive, so I hope I didn't — perhaps more I should have said "I would be surprised if 'acting a little odd' was a result of CPU damage, but I wouldn't absolutely rule it out'.

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8 hours ago, cheesestraws said:

asking questions is almost never a bad idea, especially when you want to know about systems you're relying on :-).  I didn't mean to sound at all dismissive, so I hope I didn't — perhaps more I should have said "I would be surprised if 'acting a little odd' was a result of CPU damage, but I wouldn't absolutely rule it out'.

No, you weren't sounding dismissive.  There have been times others have made me feel like an object of ridicule because of my vast lack of knowledge, but for the most part, people on these forums have been very kind.  I can't say that you guys don't go way over my head often, but there are always folks who are patient enough with me to simplify it enough that I can usually figure it out.  And when we do that, I learn.

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We’re a pretty friendly forum, no question is dumb. Capacitor change as suggested would be your first step towards figuring it out.

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When you say it's behaving weird, what exactly does that mean?  You get signs of life out of it but it behaves erratically?  If you even get a chime (either kind) out of it I'd think that eliminates the CPU as being the problem.

 

I have a IIci with what I believe to be a dead 68030, and that's because it does nothing at all after poweron -- no chime, nothing on the address lines, etc, even with a good system clock.

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12 hours ago, tattar8 said:

have a IIci with what I believe to be a dead 68030, and that's because it does nothing at all after poweron -- no chime, nothing on the address lines, etc, even with a good system clock.

Make sure you have the jumper on for the ROM select..  This is exactly what happens when that jumper is missing.

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On 7/9/2020 at 8:59 AM, PB145B said:

It looks to me like those caps have already been replaced and that is flux. :) 

Yes.  The capacitors have all been replaced.  We went through our inventory of all of our IIsi and IIci units and had the capacitors replaced.

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On 7/9/2020 at 9:16 AM, tattar8 said:

When you say it's behaving weird, what exactly does that mean?  You get signs of life out of it but it behaves erratically?  If you even get a chime (either kind) out of it I'd think that eliminates the CPU as being the problem.

It powers on and boots up normally, but it is not communicating correctly with the machine it is connected to by a pair of dongles.  It has a SCSI2SD replacing its HDD.  To be honest, my bet is that something in the PAC software isn't quite right because EVERYTHING else works correctly.  Also, when we replaced the IIci with a backup unit we have that contains a conventional HDD, the odd behavior disappears.  I have 2 of these machines that use a Mac IIsi as their brain, and those are both using SCSI2SD instead of HDD. SInce the IIsi units are running flawlessly, I am thinking there is something not quite right with the software on the IIci.  I just saw that gunky chip when I pulled the power supply so I could get at the dirty gunky floppy drive to put a clean one in.  I am SO not sticking my "hard to replace" floppies into a dirty drive.

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Someone once asked me how we are using these units, and my boss said it was okay to explain our set-up.  We run three machines that use very old Macs to tell them what to do.  Here are a couple of pictures:

IMG-4068.JPG

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The IIsi or the IIci lives in side one of these operator consoles.  The environment is very hot in the summer, and very dirty all year 'round.  It's a metal fabricating shop.imageproxy.php?img=&key=fcb9af74e9143c1bimageproxy.php?img=&key=fcb9af74e9143c1bimageproxy.php?img=&key=fcb9af74e9143c1b

IMG-4073.JPG

IMG-4070.JPG

Edited by Iamanamma
Added pictures and details

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Wow, I'm amazed some older macs are still doing duty in CNC shops! So cool to see!  Now I understand the comments about dongles and PAC software. 

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To work correctly, the clamps must open and close, the stops need to engage or disengage, the turret must spin to the correct location, and the sheet has to reference correctly.

IMG-4069.JPG

IMG-4074.JPG

IMG-4072.JPG

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8 hours ago, Iamanamma said:

Someone once asked me how we are using these units, and my boss said it was okay to explain our set-up.

This is really interesting.  Thankyou for sharing the pictures with us.  I think your use case is one of the most interesting of anyone on these forums.

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8 hours ago, Iamanamma said:

Someone once asked me how we are using these units, and my boss said it was okay to explain our set-up.  We run three machines that use very old Macs to tell them what to do.  Here are a couple of picturesimageproxy.php?img=&key=fcb9af74e9143c1bimageproxy.php?img=&key=fcb9af74e9143c1bimageproxy.php?img=&key=fcb9af74e9143c1bimageproxy.php?img=&key=fcb9af74e9143c1b:

IMG-4068.JPG

That’s the biggest can opener I’ve ever seen!!

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