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I upgraded my memory past 8 MB, but a bunch of memory seems to be missing or used by the OS. Where did it go?
It’s there, but you need to switch from 24-bit to 32-bit addressing in the Memory control panel.
The oldest Macs (68000-based) and Mac OS versions prior to System 7 only run in a 24-bit addressing mode. To maintain compatibility, and because the operating system didn’t support 32-bit addressing until System 7, later Macs defaulted to 24-bit addressing. Apple didn’t abandon 24-bit addressing as an option until the Centris 660av and Quadra 840av shipped in July 1993. Power Macs only operate in 32-bit mode. (Mac OS 7.6, which arrived in January 1997, was the first 32-bit only Mac OS.)
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System 7 was Apple’s first operating system to support 32-bit addressing. This broke through the 8 MB memory barrier on all Macs not based on the 68000 CPU. With 32-bit addressing enabled, many models can support 64-128 MB of memory – and a few as much as 256 MB.
Without enabling 32-bit addressing, the Mac OS only has access to 8 MB of memory. Anything beyond that is reported as used by the system.
One more problem is that some of the earlier Macs (Mac II, IIx, SE/30, IIcx) didn’t ship with 32-bit “clean” ROMs, meaning they couldn’t operate in 32-bit mode without some help. Connectix created a program, Mode32 (search the page for “mode32”), which let Macs with “dirty” ROMs operate in 32-bit mode. Apple licensed the software, allowing any Mac user who needs it to download a copy for free.
Another related problem comes with the LC II and Color Classic; they can only see 10 MB of RAM – even if you have 12 MB installed.
Maximum RAM for the Oldest Macs
Models that support up to 10 MB can access it in 24-bit mode (System 6 and 7). Macs that support more memory than that require 32-bit operation to access anything behind 8 MB.
- Mac Plus, SE, and Classic: 4 MB
- Mac Portable (backlit) and PowerBook 100: 8 MB
- Mac Portable: 9 MB
- Mac LC, LC II, Classic II, and Color Classic: 10 MB
Require Mode32 Beyond 8 MB
- Mac II: 20 MB normally, 4 MB and larger SIMMs must be PAL
- Mac IIx: 128 MB, 4 MB and larger SIMMs must be PAL
- Mac SE/30 and Mac IIcx: 128 MB using regular 30-pin SIMMs
Keywords: #24bitaddressing #32bitaddressing #mode32
Short link: http://goo.gl/2MHiiv
searchword: mode32
Apple began transitioning to 64-bit hardware and software technology for Mac over a decade ago, and all modern Macs now include powerful 64-bit processors that can run advanced 64-bit apps. These apps can access dramatically more memory, enable faster system performance, and take advantage of technologies that define today's Mac experience, such as Metal graphics acceleration.
Apple has been working with developers to transition their apps, and in 2018 Apple informed them that macOS Mojave would be the last version of macOS to run 32-bit apps.
Apple's transition to 64-bit technology is now complete. Starting with macOS Catalina, 32-bit apps are no longer compatible with macOS. If you have a 32-bit app, please check with the app developer for a 64-bit version.
Opening 32-bit apps
When you attempt to open a 32-bit app, you will see an alert that the app needs to be updated to work with this version of macOS, or that the app is not optimized for your Mac and needs to be updated.
macOS Catalina
macOS Mojave and macOS High Sierra
If you haven't upgraded to macOS Catalina, you can still open and use the app, but you should check with the app developer for a 64-bit version that also works with the latest macOS.
How to find 32-bit apps on your Mac
System Information can find 32-bit apps that are installed on your Mac:
- Choose Apple menu > About This Mac, then click the System Report button.
- Select Legacy Software in the sidebar. All legacy software is 32-bit.
- If you don't see Legacy Software in the sidebar, select Applications in the sidebar, then check the list of apps on the right. The column labeled ”64-Bit (Intel)” shows ”No” for apps that are 32-bit.
When upgrading to macOS Catalina, the installer shows a list of recently used apps that are 32-bit. You can review this list before choosing whether to cancel or continue the installation:
![Bit Bit](/uploads/1/1/9/5/119565929/438955468.png)
macOS Catalina also shows a prohibitory symbol over the icon of each 32-bit app in the Finder, letting you know that the app will not open.
Mac Os For 7 32 Bit 64
How to contact the app developer
The developer (or vendor) is the person or company that made the app. The easiest way to find contact information for an app's developer is to search the web for their name or the name of their app. Learn more about contacting third-party vendors.
To find the name of the developer:
- Select the app in the Finder.
- Choose File > Get Info from the menu bar.
- Look for copyright information in the Info window. For example, Apple is the developer of this app: