The Quadra 840av has no system memory on its motherboard and has four 72-pin SIMM sockets for memory expansion to 128 MB.
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.
Whether marked Quadra 630, LC 630, or Performa 63x, this model has 4 MB of RAM soldered to the motherboard and a single 72-pin SIMM socket for memory expansion up to 36 MB. (The DOS Compatible version and some 630s have a different motherboard with two SIMM slots and are covered on a separate page.)
In recent weeks we’ve done an in-depth look at Mac floppy disk formats, published a 5-part series on Palm, launched a Facebook group for Newton users, looked at memory upgrade options for long-discontinued Macs, talked about the Mac Color Classic, and looked at some of the more obscure Mac clones from the mid-1990s. Earlier this […]
The Color Classic has been lauded by many Mac faithful as what the original Macintosh should have been. The computer was made available to the general public on February 10, 1993, and was received well by reviewers.
Earlier today in the Apple Macintosh Enthusiasts Facebook group, Charles Lott asked if an OS X Mac with a USB floppy drive could write disks that a Mac running System 7 could use. The short answer is, it depends.
On August 2, 2016, Firefox 48.0 was released. It is scheduled to be replaced by Firefox 49.0 on September 13, 2016. At that point, Mac users using OS X 10.6 Snow Leopard, 10.7 Lion, and 10.8 Mountain Lion will be left behind by the current versions of Firefox. It will be a sad day, as […]
In an update to my article, Low End Wireless Hard Drive Review: The EMTEC P600, I have been able to discover some of the more intricate features of the wireless hard drive and how it can fit into a variety of “real world” usage cases. Here are some of the things of note after learning more about […]
Apple released the first Mac mini with a 64-bit CPU in August 2007, although the Mac OS that shipped with it was a 32-bit operating system, whether OS X 10.4 Tiger or 10.5 Leopard. It wasn’t until OS X 10.6 Snow Leopard arrived two years later – in August 2009 – that we had the […]
Pokemon Go officially requires iOS 8 and an iPhone 5/5c – but it does run on an iPhone 4s. I check it out.
Life was so much easier in the olden days of the Classic Mac OS. Every PostScript printer worked with Apple’s standard LaserWriter driver. That’s not true in the world of Mac OS X, where you need the correct CUPS printer definition to take advantage of all your printer’s features.
I think I’ve wanted to have a fisheye lens since I was in high school. A fisheye lens usually covers a 180° angle, although some are 150-170° and a couple very expensive Nikkors managed to cover 220°! To cover such a wide angle, these lenses introduced a curved distortion that is instantly recognizable.
We love old technology, especially old tech that worked well. That’s why we’re passionate about Mac – and big fans of Palm OS PDAs and smartphones. This page lists all of our content about the Palm OS and the hardware that ran it.
Palm had started as a software company that decided to make its own PDA because nobody else saw what Palm’s founders did. Palm dominated the PDA world and was one of the strongest players in the smartphone realm as well. So what went wrong?
Apple introduced the Mac mini in January 2005 as the smallest consumer computer on the planet. The original version ran a 1.25 GHz or 1.42 GHz G4 CPU on a 167 MHz bus and accepts a maximum 1 GB of system memory. It shipped with OS X 10.3 Panther and also supports 10.4 Tiger and […]
Downgrading from iOS 10 beta is easier than you think. I take you through how to complete the process and return to the latest official version.
Handspring had been founded by several members of Palm Computing in June 1998 and was the second Palm OS licensee to ship product – and probably the most successful (see Part 3). In 2003, Palm Inc. merged with Handspring in a mutual agreement by both companies. This marks a new chapter in the story of […]
Apple took a nice step forward when it introduced the first Aluminum iMacs (iMac7,1) in August 1997. The logic board uses the Santa Rosa chipset, and it has an 800 MHz data bus, up from 667 MHz on earlier Intel-based iMacs. The CPU sits in a socket (Socket P), so you can upgrade it!
The first three generations of Intel-based iMacs use the same Socket M to mount the CPU and have a 667 MHz system bus. The CPU is not soldered in place, allowing the Early 2006, Mid 2006, and Late 2006 iMacs to take the same CPU upgrades, bringing speeds as high as 2.33 GHz.
The first three generations of Intel-based Mac minis used the same Socket M to mount the CPU on a 667 MHz system bus. The CPU is not soldered in place, allowing the Early 2006, Late 2006, and Mid 2007 models to take the same CPU upgrades, bringing speeds as high as 2.33 GHz.
The Treo revolutionized the PDA market. Earlier attempts at wireless PDAs failed to make an impression on the market – the Motorola Marco and the Qualcomm pdQ were notable examples. They were much larger than their non-wireless counterparts, were expensive, and had only limited wireless functionality.
With the release of the first PalmPilots on March 10, 1996, Palm finally addressed issues it had been dealing with by making software for other people’s hardware since 1992 (see Part 1). For the first time, Palm had its own hardware and software, and the Palm brand became synonymous with PDA (Personal Digital Assistant).
This page lists some of the best software for the Classic Mac OS – System 6 through Mac OS 9.2.2 – in my admittedly biased opinion. Listings are alphabetical, and some programs have OS X versions as well as classic ones. Many links are to archived files in my Dropbox.
Palm Computing was largely the creation and vision of one man, Jeff Hawkins. Palm first brought tablet computing to consumers in the form of PDAs (but was beaten by Apple and its scions). The later – and more momentous – goal was to bring consumers to PDAs through simple and very fast user interfaces. This […]
I’ve just finished wading through 6+ years worth of press releases from Gartner Group, digging out quarterly PC sales results from Holiday Quarter 2008 through 2nd Quarter 2016. Why? Because the global PC market is in decline, and I wanted to see how Mac sales compared to Windows sales.
For nearly as long as I’ve published Low End Mac, we’ve had the “Road Apples” category for Macs that we felt didn’t live up to their potential (here’s an archive link to the 1998 Road Apples index). Sometimes it was because of hardware architecture. Sometimes it was because of unnecessary memory ceilings. And much of […]
I’ve been using a standup desk in my home office, and my recent job manufacturing high pressure air hoses required me to stand most of the day. A standing desk makes it easier to move around than sitting in a chair, but it can be hard on your body in other ways.