DN5@PSUVM.BITNET (11/22/89)
Hi,
Is it possible for a single Mac II to run both Mac OS and AUX? Not at the
same time, but be able to choose between the two operating systems at
startup time?
If this is possible, what would I need to add to my Mac II to do this. It
has (at the moment): 5 Meg RAM, 40 Meg hard disk, B&W monitor. I assume that
I'll need an external hard disk of at least 80 Megs.
D. Jay Newman
dn5@psuvm.psu.edudwb@sticks.apple.com (David W. Berry) (11/22/89)
In article <89325.135151DN5@PSUVM.BITNET> DN5@PSUVM.BITNET writes: >Hi, > >Is it possible for a single Mac II to run both Mac OS and AUX? Not at the >same time, but be able to choose between the two operating systems at >startup time? Yup, sure is. A/UX is booted by a Macintosh application called sash. If you make sash the startup application, and enable sash's autoboot feature, your machine will boot the Macintosh OS, load and execute sash, and then load and execute A/UX, thus trashing the Macintosh OS. This autoboot process can be interrupted while sash is running. If you don't set sash as the startup application, it can be started at your convenience. > >If this is possible, what would I need to add to my Mac II to do this. It >has (at the moment): 5 Meg RAM, 40 Meg hard disk, B&W monitor. I assume that >I'll need an external hard disk of at least 80 Megs. A PMMU and an drive > 80 meg on which to install A/UX. Opinions: MINE, ALL MINE! (greedy evil chuckle) David W. Berry (A/UX Toolbox Engineer) dwb@apple.com 973-5168@408.MaBell AppleLink: berry1
lemke@radius.UUCP (Steve Lemke) (11/22/89)
In article <89325.135151DN5@PSUVM.BITNET> dn5@psuvm.psu.edu writes: } }Is it possible for a single Mac II to run both Mac OS and AUX? Not at the }same time, but be able to choose between the two operating systems at }startup time? } } D. Jay Newman } dn5@psuvm.psu.edu Yes, I do this at home - I have a 140mb internal drive with Mac OS on it, and I have an 80mb external with A/UX. I have a normal SCSI cable going from the Mac to the external drive, and an external terminator on it as well. The reason I mention this is to tell you a slick way to switch back and forth with minimal hassle. Turn both drives on, and boot from the internal. This should happen by default. Then pull down the control panel, and set the startup to the A/UX drive. From here on out, when you want to boot A/UX, turn the A/UX drive on before turning on the Mac, or if the Mac is already on then turn on the A/UX drive and do a restart. If you want to boot MacOS, just leave the A/UX (external) drive off while you boot. The Mac will look for the external drive but since it's not on it will boot the internal drive anyway. If you're running A/UX and want to go back to MacOS, do your "sync;sync;sync;shutdown", and when you get back to single user mode, do "sync;sync;sync;reboot". The drive will run for about 30 seconds, after which the machine will chime and restart. Turn the drive off right when the Mac chimes the startup chime. With practice, you can learn to identify when the drive stops and is about to reboot, and it can be shut off just before the chime. I've been doing this for almost a year now without any problems. -- ----- Steve Lemke, Engineering Quality Assurance, Radius Inc., San Jose ----- ----- Reply to: radius!lemke@apple.com (Coming soon: radius.com ...) ----- ----- AppleLink: Radius.QA; GEnie: S.Lemke; Compu$erve: 73627,570 -----