The Quadra 840av has no system memory on its motherboard and has four 72-pin SIMM sockets for memory expansion to 128 MB.
Category Archives: Low End Mac
- 'Book Value
- 10 Forward
- 75 Mac Advantages
- Adam's Apple
- Apple Archive
- Apple Before the Mac
- Apple Everywhere
- Apple History
- Apple, Tech, and Gaming
- Back & Forth
- Benchmarks
- Best Tools for the Job
- Building Bridges
- Classic Mac Nostalgia
- Classic Mac OS Software
- Classic Restorations
- Collection Spotlight
- Compleat Guides
- CustoMacs
- Developer Transition Kits
- Different Branches
- Digital Fossils
- Down but Not Out
- Early Mac Clones
- Edelweiss
- Embracing Obsolescence
- Empowered
- Hacking Your Mac
- iBasics
- iBasics Classic iBasics articles for the Classic Mac OS
- iMac Channel
- In My Palm
- Interviews
- iOS & iDevices Articles about iOS and iOS devices: iPhone, iPad, and iPod touch
- iOS Accessories
- iOS Apps
- iOS Hardware iOS devices and accessories.
- iTed Talks
- Kitchens Sync
- Leo and Mac
- Linux to Mac
- Low End Campfire Discussion Campfire style storytelling of Apple finds, exciting discoveries and more.
- Low End Mac FAQs
- Low End Mac Mailbag
- Low End Mac Round Table Low End Mac round table discussion.
- Low End Mac Tech Journal
- The Serker Files
- Mac "Extras"
- Mac Accessories
- Mac CPU Upgrades
- Mac Daniel
- Mac Fallout Shelter
- Mac Gaming
- Mac Happens
- Mac History
- Mac Lab Report
- Mac Life
- Mac Metamorphosis
- LinuxPPC Chronicles
- Mac Musings
- Mac OS X Software
- Mac Resources
- Mac Restorations
- Mac Scope
- Mac to Windows Articles about using Macs and Windows PCs together.
- Mac UK
- Mac USB & FireWire
- MacInSchool
- Macinthoughts
- MacPaint and Its Children
- Matt's Macs
- Maximize Your Mac Jason Schrader's tips on getting the most out of your Mac hardware.
- Bluetooth & Wifi Upgrades
- Memory Upgrade Options
- Menagerie of Macs
- Miscellaneous Ramblings
- Moore's Mailbag
- My First Mac
- My Turn
- Older G4 Macs in the Age of Leopard
- One More Thing
- Online Thrifter
- Orchard
- Overclocking Your Vintage Mac
- Plays Well with Others
- PPC Linux
- Printer Reviews
- Reality Check
- Recycled Computing
- Second Class Macs
- SETI on Mac
- Software FAQs
- Stop the Noiz - Frank Fox tries to cut through the static and get to the facts.
- Taking Back the Market - Tim Nash on how Apple can retake its markets.
- Tangerine Fusion
- Tech Spectrum
- Tech Stuff
- The 'Book Page
- The Efficient Mac User
- The Lite Side
- Bumper Snickers
- The Low End Designer
- The Mac Pack Rat The every day adventures of a Macintosh Pack Rat. Repairing and using lower end machines for productive daily work.
- The Mobile Mac
- The Odyssey
- The Power of Mac
- The Practical Mac
- The Productive Mac
- The Review Vault
- The Road Warrior
- The Rumor Mill
- The Value Equation
- Things Macintosh
- 10 Commandments of the Church of Macintosh
- Triassic Mac
- Unofficial SuperMac Support Site
- Using WordPress - Tips on using WordPress, particularly as deployed at Low End Mac.
- View from the Classroom
- Busman's Holiday
- Teacher Tools
- View From the MacCave
- Vintage Mac Living
- Vintage Mac Workhorses
- Welcome to Macintosh
- In House with Low End Mac
- Working with Vintage Macs
- Zis Mac - Alan Zisman on Macs, iOS, and other tech.
The Centris 660av and Quadra 660av are identical except for the name plate. They have 4 MB of RAM soldered to the motherboard and two 72-pin SIMM sockets for memory expansion.
Whether marked Quadra 630 DOS Compatible, LC 630 DOS Compatible, or Performa 631 or 640, these models have 4 MB of RAM soldered to the motherboard, two 72-pin SIMM sockets for memory expansion up to 52 MB, and usually a DOS Compatibility card as well.
This page provides information about modifying the motherboard in your Quadra, Performa, or LC 630 series computer. Such modifications are not authorized by Apple. Any modifications you perform on your Mac may damage it. Modifications are done at your own risk.
Apple broke the speed envelope with the Mac IIfx – the 40 MHz 68030 CPU on a 40 MHz data bus left everything else in the dust. Because it needed faster memory than any previous Mac, it used a special 64-pin dual-ported SIMM. It was the first Mac to ship with 4 MB of RAM.
The Mac IIci took the popular Mac IIcx design and replaced its 16 MHz logic board with a 25 MHz 68030-based design. New features included built-in video and a Level 2 (L2) cache socket. The IIci was the first Mac with “32-bit clean” ROMs.