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8100/80AV Unstable
- Thread starter Qrani
- Start date
Phipli
Well-known member
Hum, that shouldn't be on either.
3lectr1cPPC
Well-known member
Thank you very much for the photo and values! I'll add them to my website for the next update.
capa150
Active member
Is the ram the correct RAM type for this mac?
My blue and white G3 was crashing too frequently and randomly. Every 1-4 hours maybe. I did two things that fixed the problem but I don't know which actually solved the problem, ha ha. The first: I bought an official MacOS install CD off ebay. Earlier I had been using a version of MacOS I downloaded from the internet. The second thing is I replaced the four PC133 RAM sticks with a single proper brand new PC100 RAM stick from OWC ($8 new!).
My blue and white G3 was crashing too frequently and randomly. Every 1-4 hours maybe. I did two things that fixed the problem but I don't know which actually solved the problem, ha ha. The first: I bought an official MacOS install CD off ebay. Earlier I had been using a version of MacOS I downloaded from the internet. The second thing is I replaced the four PC133 RAM sticks with a single proper brand new PC100 RAM stick from OWC ($8 new!).
capa150
Active member
I uploaded the CDROm image of the CD I purchased btw:
And here's the 8.6 update https://download.info.apple.com/App...m/Mac_OS_8.6_Update/Mac_OS_8.6_Update.smi.bin
MacOS 8.5 / 8.5.1 for Power Macintosh G3 (1998) [PROVENANCE TO BE VERIFIED] - Macintosh Repository
An ISO file of the official Blue and White Power Macintosh G3 8.5 / 8.5.1 MacOS installer CDROM. This CDROM has a green label titled...
www.macintoshrepository.org
And here's the 8.6 update https://download.info.apple.com/App...m/Mac_OS_8.6_Update/Mac_OS_8.6_Update.smi.bin
LaPorta
Well-known member
This might sound crazy, and is pure conjecture on my part...but there's the possibility that there could be a power supply related issue. My 8100 had crazy issues: freezing after working for five minutes for no reason, not wanting to recognize RAM, all sorts of weirdness. Could never track down the issue. On a lark, I got a new PSU....and it worked fine. I put a scope on the output of the PSU vs the new PSU....the original had some very fine, low oscillations - basically, the power coming out of it was "dirty." This somehow cause all the havoc that I was having.
Not saying this is your problem, but I know the Delta PSUs in there are temperamental at best to begin with. Maybe look into that too if you can't figure it out.
Not saying this is your problem, but I know the Delta PSUs in there are temperamental at best to begin with. Maybe look into that too if you can't figure it out.
3lectr1cPPC
Well-known member
Seems like a good opportunity for an ATX conversion.
Phipli
Well-known member
PC133 works in a PC100 computer, so that specifically wasn't the issue, although perhaps something else wasn't right with the RAM, who knows.
The 133 is basically just the rated speed of the RAM. The B&W requires a minimum of PC100. The beige G3 requires PC66, but I have PC133 in most of mine.
Qrani
Active member
When I first got the machine I couldn't get it to properly start up, so I tried the power supply from my PowerMac 7500, and it started up that one time, so I thought it was an issue with the PSU. I was gonna do an ATX conversion, got around to measuring the voltages, working on making a connector, etc. But then I tried to use the 7500's PSU again later and it didn't start. Turns out both give perfectly fine voltages, and it was probably an issue with the motherboard. I've been meaning to try it out with the 7500's PSU again, because while I know the 8100's has the correct voltages, that doesn't mean it necessarily is working, especially when being used on the computer.
Unknown_K
Well-known member
Some machines are picky about chip density which changed going from pc66 to pc100 and pc133 and even within the same spec as time went on.
Phipli
Well-known member
Yes, the trick is to get 256MB SIMMs with 16 chips.
I saw in your original post, you have the AV version. Are you testing with the AV card installed? An empty PDS slot could cause problems.
On your CDROM drive, is it possible you have all three SCSI ID jumpers installed? It's been a long time but I think I only saw that repeated device when two devices had the same ID. Since you only have two devices and the motherboard ID is fixed at 7, the CDROM would have to be set to 7 to cause a conflict. All three ID jumpers gives 7.
Maybe a little farfetched...
Qrani
Active member
Yes the AV card is installed. I need it so I can use a monitor as I don't have one for the HDI-45 port, or an adapter. The CD-ROM drive is set to either a SCSI ID of 1 or 2. I believe the CD-ROM drive only actually has jumpers labeled 0, 1, and 2, so I don't think I could set it to an ID of 7 if I wanted to. And what does the 0 jumper do? No clue. But regardless it works perfectly fine when connected to the other SCSI bus, which the only other device on would be the computer itself, so it's not an issue with jumpers
The jumpers represent different powers of 2 and they're additive. Hence, 0 => 2^0 =1; 1 => 2^1 = 2; 2 => 2^2 = 4.
For example, jumpers on 0 and 2 gives you 1 + 4 = 5, so SCSI ID 5.
Jumpers on 0, 1 and 2 would give you 1 + 2 + 4 = 7.
Some devices actually label the jumpers 1, 2, and 4, instead of 0, 1, and 2, which is a little easier to understand.
