Depending on how much ram is in there, any of the 7.xx series should work,
and you will need the system enabler.
I don't remember if any of the flavors of 8 will work on it.
On 10/25/09 3:38 AM, "Alexis" <thrashbarg at kaput.homeunix.org> wrote:
Hi,
I've got a Mac Quadra 660AV which refuses to install any system software,
except System 7.1, which it refuses to boot from (apparently it needs a newer
version, but web pages about the Mac say it should work). I've tried System
7.1, 7.5 through 7.5.3, and Mac OS 7.6.
It happens right at the end of the install, when the system is being
finalised. I've replaced the battery, cleared the NVRAM, updated the disk
driver and set the date. I'm using the original hard drive.
Does anyone have any ideas?
Alexis.