On Dec 17, 2006, at 3:08 PM, Pete Edwards wrote: 4.0.5 is not what has since become known as a "unified release". Each release of 4.0.5 supports only a specific collection of hardware. If you are taking a disk installed on one machine and trying to boot it in another, you have a very different problem. IRIX install media contains collections of software optimized specifically for both processor (according to IP number) and graphics options. The correct collection for a given machine is selected automatically during installation, such that any given installed copy of IRIX supports only the exact hardware (or substantially similar hardware) it was installed on. Upgrade from an R3000 (IP12) to R4000 (IP20) Indigo, you have to re- install IRIX, but not if you upgrade from R4000 to R4400 (both IP20). Upgrade from entry graphics, you have to re-install, but not if you upgrade from anything else. The foregoing is true no matter what release of IRIX you are looking at. It doesn't stop being true even if you use a "unified release" like 5.3 or 6.5. Yes, many of the 4.0.5 releases were available on CD. Not many machines had CD-ROM drives when 4.0.5 was current, though, so most media was shipped on QIC; that's what SGI owners had in 1993, for the most part. ok bear