Update: Someone pointed out to me that there is a Collector's forum for this type of model. I've cross-posted at http://forums.macrumors.com/showthread.php?p=20425702 - Mods: could you please delete this thread if appropriate - thanks! Hi there, I recently got a Quadra 900, and I'm having fun upgrading it to see how far it can go. The machine came out in 1991, and was an absolute monster in it's time. I've ordered the following upgrades: 256 MB of ram (16x 16MB SIMM) - that's right, 256 MB in a 1991 machine! Apple Display Card 24AC - should get me 24bit colour @ 1152x870 3.6v lithium battery - should stop it from thinking it's 1954 I even got it on the internet thanks to a AAUI-15 to 10BaseT converter. It downloads at ~70 KB/s max (any idea what can make it faster?) I'm now turning my attention to the internal SCSI drives - it has two 160 MB drives. What I'd like to do is put the largest Apple branded SCSI drive the machine will take - I just have no idea what that would be despite much searching. I'd expect there are two important aspects here - what is compatible hardware-wise, and what is compatible OS-wise. I'm not sure what the difference is between Mac OS 7.6.1 and Mac OS 8.1 in terms of max partition size. So does anyone have an idea of how big an Apple SCSI drive this monster can take? Thanks! -- P.S. I'm looking for a PPC upgrade card and an internal CD-ROM drive + Bezel if anyone has one. P.S.S. I am thinking the best monitor to get for it would be the Macintosh 21" Color Display since it came out at the same time. Opinions?