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| SE/30 not booting from hard drive |
Posted by: xfcrowman on 2020-07-07 03:41:09
I have been working on a Mac SE/30 restoration and it is exhibiting a strange problem where it can't boot from a SCSI hard drive. To start, I replaced all the electrolytic capacitors and cleaned the board with alcohol to get rid of any remaining electrolyte. After the re-cap the SE/30 boots from the floppy drive and it the SCSI drive also shows up and can be used.
However, if I try booting from the drive it hangs on the "Welcome to Macintosh" screen. Activity sounds continue from the SCSI drive continue even though it doesn't complete the boot process. I have also tried using a SCSi2SD with the same result.
From here I am guessing that I may have one or more bad traces from the cap leakage, or possibly a bad SCSI cable? Has anyone else resolved a similar issue?
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Posted by: Crutch on 2020-07-07 04:29:15
It feels very unlikely to me that you are having a hardware problem (bad traces or bad cable) and the SCSI drive would show up and work perfectly if you start from a floppy. It sounds much more likely there is something on your hard drive causing an incompatibility.
Have you tried booting with extensions off?
Have you tried installing a fresh OS on the HD (try 6.0.8, nice and small and compatible) and booting from that?
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Posted by: xfcrowman on 2020-07-07 06:02:35
Normally I would suspect the hard drive as well, but in this case I can get it to boot from my Mac SE. The same is also true of the SCSI2SD - it works just fine in my Mac Performa and Mac SE but not the SE/30. This is why I suspect there is something still wrong with the logic board
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Posted by: Crutch on 2020-07-07 07:19:35
Does your SE/30 have a stock ROM?
What system version are you running?
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Posted by: techknight on 2020-07-08 01:32:57
Check the connections to your SCC IC for breaks. Try system 6
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Posted by: Bolle on 2020-07-08 03:13:14
Also if the data and/or clock traces between Via and RTC/PRAM are broken you won’t be able to boot from HDD.
I am not totally sure though if it starts to boot and then hangs or if it wouldn’t boot at all. It’s been some time ago when I had a board on my bench where this was the problem.
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Posted by: Crutch on 2020-07-08 03:30:21
.... but you could access it post-boot??
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Posted by: Bolle on 2020-07-08 05:20:00
Yes.
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Posted by: ttb on 2020-07-10 11:35:03
I ran into this same issue with my first SE/30. It happened 100% of the time with a modded ROM trying to boot 7.5.5. System 6 was fine. Putting the original ROM back in it would boot 7.5.5 okay most of the time. It still sometimes hangs in the welcome to Mac screen which I attribute to some intermittent vias at the SCSI chip as techknight mentioned. I still haven’t resolved that completely, though.
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Posted by: Crutch on 2020-07-10 12:08:16
Did you do the required ResEdit hack to the system file to run 7.5.5 with a modded ROM on an SE/30? If not it will hang at Welcome to Macintosh 100% of the time, but System 6 will run fine. This is why I asked OP what System version and ROM he was running.
https://www.bigmessowires.com/mac-se30-with-upgraded-rom/
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Posted by: ttb on 2020-07-11 00:24:43
Nope, but you’re totally right, I now remember I realized that after the fact 🙂 Hopefully that helps the OP.
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Posted by: techknight on 2020-07-12 23:11:02
Oh, I didnt know you had to do such a thing.
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