I picked up a Quadra 700 on eBay. Although it powered on out-of-the-box, it needed a bit of upgrading to be useful. I pulled together information from a number of external resources, and am writing it up here in the hope that it’ll save someone else a few hours of research.
Here’s what you need:
- More memory. Four sticks of 30-pin 16Mb SIMMs can be purchased at OWC (https://eshop.macsales.com/item/OWC/30PS16MB/)
- A SCSI drive. The SCSI2SD (http://www.codesrc.com/mediawiki/index.php/SCSI2SD) is a durable replacement for increasingly expensive and unreliable traditional SCSI drives.
- MacOS. 8.1 can be found at https://archive.org/details/MacOS_8_Version_8.1_691-1912-A_Apple_Computer_Inc._1998
- A VGA converter. The design at http://www.codesrc.com/mediawiki/index.php?title=Macintosh_VGA seems to work well, although one of my monitors needed DB-15 pin 3 to be connected to VGA pin 13 (instead of DB-15 pin 15)
- (optional) more VRAM. Expansion to two megabytes will enable 800x600x24. Six sticks of 68-pin 256k SIMMs can be found on eBay; I purchased https://www.ebay.com/itm/512KB-68-Pin-Apple-Centris-PowerMac-Quadra-LC-Video-80ns-VRAM-M1311LL-A-SIMM/371859364672
- (optional) A USB-to-ADB keyboard/mouse converter. The Wombat (http://www.bigmessowires.com/usb-wombat/) works fairly well.
- (optional) Feet for standing the case vertically. These are nearly always missing; 3D-printable models can be found at http://www.synack.net/~bbraun/mac3d/
- (optional) Feet for standing the case horizontally. This unit still had one, so I measured it with calipers and created a 3D model in OpenSCAD. The source and STL are at https://www.thingiverse.com/thing:3934858.
- (optional) An AAUI network transciever.
- (optional) A Raspberry Pi to act as an AppleTalk server.
(I’ll insert spinup guidelines here as time permits)