Hi there.
This is my first post on this board, but I've already used the information in threads here to narrow down my problem.
I recently picked up an SE/30 from a local shop, super cheap ($25).
It boots from floppy just fine.
It will boot from its hard disk into System 7.5.X and load all of the extensions, but immediately hangs at the desktop when loading the Finder, and the hard disk doesn't show up on the desktop.
It will throw various errors when it hangs, sometimes a bus error, sometimes error 10.
The hard drive also does not mount when booting from floppy.
It won't show up for Apple HD SC, but it will show up for Disk First Aid's first menu... but no luck after that.
Using a sketch from this forum, I checked the continuity between pins on the SCSI chip, and their corresponding pins on other chips and connectors.
Everything came out OK except for the DRQ pin (third from the cut corner on the chip - see attached sketch, I indicated the pin in red). I get nothing between that pin and the corresponding pins on the Glue Logic Chip UI8 or on UK11.
I started to run the traces backwards from the UI8 and UK11 pins.
They both have a connection to a particular point on the board (see board image - point indicated in red).
The image is not my logic board, but the layout is the same.
I show no continuity between this point and the DRQ pin.
I can't really follow the trace properly from this point back towards the SCSI chip, as it goes underneath the logic board power connector.
I'm wondering if putting in a bridge from the DRQ pin to this connection point will get me SCSI back.
I don't want to make a connection that will cause any further damage, though.
Any advice?
This is my first post on this board, but I've already used the information in threads here to narrow down my problem.
I recently picked up an SE/30 from a local shop, super cheap ($25).
It boots from floppy just fine.
It will boot from its hard disk into System 7.5.X and load all of the extensions, but immediately hangs at the desktop when loading the Finder, and the hard disk doesn't show up on the desktop.
It will throw various errors when it hangs, sometimes a bus error, sometimes error 10.
The hard drive also does not mount when booting from floppy.
It won't show up for Apple HD SC, but it will show up for Disk First Aid's first menu... but no luck after that.
Using a sketch from this forum, I checked the continuity between pins on the SCSI chip, and their corresponding pins on other chips and connectors.
Everything came out OK except for the DRQ pin (third from the cut corner on the chip - see attached sketch, I indicated the pin in red). I get nothing between that pin and the corresponding pins on the Glue Logic Chip UI8 or on UK11.
I started to run the traces backwards from the UI8 and UK11 pins.
They both have a connection to a particular point on the board (see board image - point indicated in red).
The image is not my logic board, but the layout is the same.
I show no continuity between this point and the DRQ pin.
I can't really follow the trace properly from this point back towards the SCSI chip, as it goes underneath the logic board power connector.
I'm wondering if putting in a bridge from the DRQ pin to this connection point will get me SCSI back.
I don't want to make a connection that will cause any further damage, though.
Any advice?
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