Re: MacXL - Crash

>And, does it matter if the harddrive is in to do these early tests ?

No, you don't need a hard drive to see a readable display and see the progress of the self-test. You can also boot from a floppy disk without a hard drive.

However/caution:

1. Apparently, some Sun20 drives had a controller bug that causes data corruption when the drive is turned on while the data cable is disconnected. Therefore, if you disconnect the Sun20, disconnect both the power and the data cables.
2. An internal hard drive adds a significant load to the power supply: with the drive disconnected, the power supply voltage may rise high enough that the over-voltage protection crowbar engages, briefly turning off the power supply. One symptom is that the machine doesn't turn on for long, with some clicking noises coming from the power supply. The cure is to increase the load again, or adjust the power supply to suit the reduced load.

Since (2) isn't necessarily a problem, you can certainly try it without the hard drive.

HTH, James

James MacPhail                   "Think not of engineering as art,
uo957_at_email.domain.hidden                 but of art as engineering"
Sigma Seven Systems Ltd.
james_at_email.domain.hidden        <http://SigmaSevenSystems.com>

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