> > I guess that would work-the only problem is that the 6 gig drive I put in >> has no OS on it. I have a SCSI CD drive. How would the SCSI CD drive work? >> There would be no drivers available for it. >> John >> >I've been able to start up a dead mac from a 3rd party SCSI CD-rom drive >before. I have a feeling that once the Mac is desperate to start-up, i.e., >no HD, no apple brand CD-ROM, no floppy etc, then it will take just about >ANY kind of system disk to run. I say that, because it only started up from >it when the HD had no system folder on it. Once that was installed, it >refused to start off the cd anymore. > >Hope this helps, > >-- >John
Hmm. See Dan K's thread of a couple weeks ago about CD-ROMs for details. Any SCSI CD (assuming no termination or SCSI-ID conflicts) is bootable with a bootable CD-ROM inserted. Put the CD in the tray, boot the Mac holding Apple-Option-Shift-Delete, and presto. CD-ROMs without specific firmware on the drive will not be recognizable by the standard Mac OS CD/DVD Driver extension. Inserting a disk into such a drive attached to a booted Mac will have no results. A 3rd party driver or hacked Apple driver is required. However, all CD-ROMs are bootable devices IF they have a valid bootable CD inserted and you force the computer to boot off a SCSI device. The Apple-Option-Shift-Delete command at boot tells the Mac to scan the SCSI bus for the first bootable volume it sees. It will start at ID 0 and work to ID 6. If you have two boot volumes (say on ID 0 and ID 3), you can specify which to start from by holding Apple-Option-Shift-Delete-<SCSI_ID_#>. ID 3 would be Apple-Option-Shift-Delete-3. If you have more than one bootable partition on the device, it will start from the first recognized partition with a boot sector. The Mac's ROM tells it to look for a bootable device in the following manner: Check the PRAM for the boot device and try booting from it. If that fails, then... Look on floppy 1 Look on floppy 2 (if available) Look on SCSI bus 0, ID 0, partition 0 Look on SCSI bus 0, ID 0, partition 1 ... Look on SCSI bus 0, ID 1 ... Look on SCSI bus 0, ID 6 Look on SCSI bus 1, ID 0 ... (etc) Look on IDE channel 0, device 0 Look on IDE channel 0, device 1 (on Macs with master/slave support) Look on IDE channel 1, device 0... ... Look on USB/FireWire (not sure how the boot sequence works here - only supported on late model macs) If no boot device is found, flash the floppy and question mark on the screen. There is also some other procedure for net booting, but that's also only on late model macs. I'm also not sure where RAM disk booting fits in this picture, but I'd guess they are only bootable if you specify it in the PRAM (using the Startup Disk control panel or something). Peace, Drew -- Author of ClassicStumbler email: <[EMAIL PROTECTED]> web: <http://homepage.mac.com/alk/> Want to know if your neighbor has Wi-Fi? Find out with ClassicStumbler! <http://homepage.mac.com/alk/classicstumbler.html> -- PowerBooks is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> PowerBooks list info: <http://lowendmac.com/lists/powerbooks.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/powerbooks%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
