窶｢ PM Graphics Accelerator (v1.0.5): provides video acceleration for PCI Macs using an ATI video card. Causes a problem with windows in WordPerfect. The solution is to try loading the extension in different orders until the problem goes away.
窶｢ Hardware System Update 1.0: part of System 7.1 Update 1.0. Provided numerous system-level improvements. This file was not designed for use on Performa models.
窶｢ Hardware System Update 2.0: part of System 7.1 Update 2.0: Provided system-level improvements to increase overall system reliability. This file was not designed for use on Performa models.
窶｢ Hardware System Update 2.0.1: part of System 7.1 Update 3.0: Provided system-level improvements to increase system reliability and performance. For all Macs running System 7.1 except for AV systems, which already have these enhancements built into their ROM.
窶｢ InLine Filter: Helps AppleScript and PlainTalk Speech Recognition work together. Allows Worldscript users to type scripts "in-line" instead of to a separate text bar. Crashes WordPerfect 3.1, but Novell has released a patch.
窶｢ Installer Cleanup: you will most likely see this extension immediately after installing new Apple software. The Apple software installer often places this temporary extension in your system folder to make sure that the installation process was successful and that everything was installed in the proper place. It loads during the restart immediately following installation, and should then disappear on its own. However, some startup managers will not allow the Installer Cleanup extension to do its thing. You should make sure that if you install Apple software and the Installer Cleanup extension is "installed," that you allow it to load at the very next startup. It should disappear. On the other hand, sometimes it doesn't disappear no matter what you do. If you still have this extension after several restarts, or if you just find it sitting there, and everything seems to be working fine, you should be able to trash it.
窶｢ Internal Modem Sound: on 5200, 5300, 6200, and 6300 series Macs, this file fixed a problem with internal Global Village modems where no modem sound was heard. It is now a part of the Audio Volume Extension (see above).
窶｢ Intelligent Battery Update: updates the battery manager on 500-series computers (actually updates the batteries themselves). The 500-series batteries have a microprocessor built into the battery to monitor the battery's "vital signs." Sometimes the data inside this microprocessor becomes corrupt and causes the System software to receive incorrect information about the battery's status (power remaining, etc.). This extension, along with the Intelligent Battery Recondition application, updates the information in the battery's microprocessor. NOTE: the application only works on the battery in the right-hand battery bay. If you have two or more batteries, you will have to use the application once for each battery by placing each one in the right-hand bay.
窶｢ IR Talk: only used by the 500 and above series PowerBooks with an InfraRed port. Allows AppleTalk connections through the IR port using the AppleTalk/Network control panels.
窶｢ LC Monitors Extension: adds functionality to the Monitors control panel for LC series Macs.
窶｢ Letterhead: part of the QuickDraw GX package, this extension enables the "Letterhead" paper type option in the "Page Setup..." window of compatible applications.
窶｢ Macintosh Drag & Drop: see Drag&Drop Extension above.
窶｢ MacTCP Token Ring Extension: allows you to use the TCP/IP protocol over a Token Ring network.
窶｢ MODE32: under System 7, gives the Mac II, IIx, IIcx, or SE/30 the ability to run in 32-bit addressing mode. All other Macs either have 32-bit addressing capability built into the ROM, run in 32-bit addressing mode all the time (AV models, PB 500s, and all PowerMacs), or are incapable of running in 32-bit addressing mode (running System 6 or have a 68000 processor). With 32-bit addressing "on," your Mac can take advantage of more than 8MB of RAM. Under System 7.5, a new version of MODE32 was released. You MUST use MODE32 7.5 if you are running System 7.5.
窶｢ Mount IDE Drive: allows Macs with IDE hard drives to mount these drives when the Mac is booted from another disk or device.
窶｢ N-Up Printing: part of the QuickDraw GX package, this extension allows you to print more than one page on a single sheet of paper by dividing the page into smaller sections and reducing the printing size. Up to 16 pages can be printed on a single 8.5x11 sheet.
窶｢ 窶｢窶｢窶｢Network Extension (v7.5.5) [NA]: allows you to choose what type of network your Mac is attached to using the AppleTalk or Network control panels. Also allows you to activate Personal File Sharing from the Finder.
窶｢ Network Launch Fix (v1.0.2): on 68040 Macs, fixed a bug when launching applications over a network. Incorporated into system 7.5 and later.
窶｢ PC Card Extension (v2.0): allows newer PowerBooks to use expansion cards that adhere to the PC Standard.
窶｢ PC Card Modem Extension (v2.0.3): allows newer PowerBooks to use modem expansion cards that adhere to the PC Standard
窶｢ PC Clipboard Translator: on Macs with a DOS Compatibility Card, allows cross-platform Clipboard capability (for example, to "copy" text on the PC side, then "paste" it on the Mac side).
窶｢ PowerBook Monitors Extension: provides added functionality for external monitors connected to a PowerBook. Contains the monitor information strings that show the resolution and scan rate for the attached monitor, as well as the PowerBook video card information string. Also provides the option of adjusting the gamma setting on color PowerBooks.
窶｢ PowerCD Extension: driver for the Apple PowerCD portable external CD-ROM drive.
窶｢ PM PowerPC Monitors Extension (v7.5): needed for use of the AV14, AV15 and AV17 monitors; superseded by Display Enabler 2.0 and later. Also needed by PM 6100AV/ 7100AV/ 8100AV models to enable video-out (such as to an RGB monitor) in the Monitors control panel.
窶｢ Printer Descriptions [NA]: this folder in the extensions folder contains printer descriptions for almost every Apple printer. It's mainly a waste of space; trash all the descriptions but the ones you use, or might use in the future (how many of us are using an ImageWriter II or a StyleWriter I?)
窶｢ Printer Share (v1.1.3): Allows your Mac to be used as a print server (i.e. another computer on the network can send a document to your computer and then your computer sends it to the printer; this frees up the processor on their computer--not useful for most people). Also allows you to share non-networkable printers (such as the Stylewriters) over a network.
窶｢ Print Monitor (v7.1.2): if you are not using Desktop Printing, this application (it's not really an extension) allows you to monitor and control your print jobs.
窶｢ Processor Info Extension: on 5200, 5300 and 6200 series Macs, fixes a bug where the computer would report the incorrect bus and processor speeds.
窶｢ ProDOS File System: allowed pre-7.5 Macs to recognize ProDOS/Apple IIe disks. Incorporated into PC Exchange 2.0.2 and later, and is incompatible with System 7.5.x.
窶｢ Quadra Monitors Extension: allows the Monitors control panel on Quadra- and Centris-series computers to reflect the capabilities of the built-in video. Provides information on the resolution and scan rate for an attached monitor. If you remove this extension, the monitor will work fine; however, the extra "options" such as gamma control will be inoperable.
窶｢ Quadra AV Monitors Extension: same as above, only for Quadra AV- and Centris AV-series computers, so it includes the AV video display options.
窶｢ QuickDraw 3D 1.0.3: This extension makes the system capaple of reading 3d models and rendering them, as well as cutting and pasting them between documents. So basically, it adds to the Macs graphics ability. It is useful if you want to browse VRML web sites, and is used and intalled by certain 3d graphics packages (such as Strata Studio Blitz 1.75) because it makes them run faster by working directly with the sytem.
窶｢ QuickTime (v2.5) [48/384]: PowerMac native. Provides built-in multimedia support for your Macintosh. Provides CD quality MIDI sound support. Provides support for importation of various graphics formats. Provides support for AutoPlay of appropriately formatted CDs. Certain CD-ROM and multimedia applications will attempt to install an older version of QuickTime, or will even attempt to install the older version along with the newer one already present. Make sure that you have not replaced 2.5 with an older version.
窶｢ QuickTime Musical Instruments (v2.5) [<.5/0]: provides support for MIDI sound files under QuickTime 2.5. Versions prior to 2.5 were actually "components." However, with the release of QuickTime 2.5, this file was, for whatever reason, "changed" to a standard extension.
窶｢ PM QuickTime PowerPlug (v2.5) [0/384-uses the memory allocated to QuickTime]: provides native code support for QuickTime when used in combination with QuickTime 2.0 or later. Dramatically improves compression performance on PowerMacs. The shared library QuickTimeLib is a part of this extension. On a PowerMac, some applications, such as Graphic Converter, will display an error such as "Can't find QuickTimeLib" if QuickTime PowerPlug is not installed.
窶｢ QuickTime PowerPC: apparently the precursor to QuickTime PowerPlug, provides PPC-native support for QuickTime. Will not work with QT PowerPlug; in fact, it will prevent QT PowerPlug from being loaded at startup.
窶｢ Record Button: provides support for the "record" button on the Apple Adjustable Keyboard. Now incorporated into the AV and PowerMac series' ROMS.
窶｢ Scanner: driver used by all "Apple-compatible" scanners (basically, all Apple scanners and any third-party scanners which were designed to use the Apple driver).
窶｢ Scripting Additions: enhances the language of the AppleScript system by adding special features such as the time of day, day of the week, or date. When installed, AppleScript behaves as if these additions are part of the standard langage. This extension is only required when using a script that incorporates them.
窶｢ SCSI Manager 4.3.1: 4.3 is part of system 7.5 and is built into the ROMS of PowerMacs and AV Macs; this update is only needed by the following machines to fix possible data corruption problems: Performa 630 series, PowerBook 150, Quadra 630, LC 630, Quadra 660AV, Quadra 840AV. It also fixes a potential crash problem with some (unspecified, unfortunately) external hard drives. However, if you are not using one of the above computers, delete this file to avoid serious problems.
窶｢ 窶｢窶｢窶｢SerialDMA 2.0.2 [17.5/?]: SerialDMA 2.0 was originally a rewrite of the serial drivers that shipped with the first AV Macs (the Centris 660AV and Quadra 840AV) and were later carried over to Apple's first line of Power Macs and their derivative models. Version 2.0.2 of SerialDMA patches some remaining bugs and adds support for Apple's newer PCI Power Macs. In addition to offering greater reliability, better performance, higher baud rates, and a number of bug fixes, version 2.0.2 should offer significant performance improvements on 68040-based AV Macintoshes, as well as fix printing problems with StyleWriters on the Power Mac 7200, 7500, 8500, and 9500. Also provides support for speeds of up to 230,400 baud. Pre-7.5.3, SerialDMA had known problems on PCI Macs with the Serial Port Arbitrator extension that's included with AppleTalk Remote Access (ARA) and with the Port Juggler extension. However, under System 7.5.3, Serial DMA is incorporated into the System or System Update 7.5.2, and these incompatabilities are reportedly resolved.
窶｢ Shared Code: this is actually a folder which is located in the "Extensions" folder. It contains the OLE code files (OLE Reg Dll, OLE Server Dll, Ole Client Dl) used by the "Shared Code Manager" of the Microsoft OLE system.
窶｢ Shared Code Manager: Provides Microsoft's object linking and embedding (OLE) system. This isn't necessary for MS applications to run, but OLE will not function without it. To use this extension, you must also have the "Shared Code" folder in your "Extensions" folder (see above).
窶｢ Shared Library Manager (v2.0) [NA]: supports loading, unloading, and sharing of object-oriented code. Provides support for Open Transport. Both this extension and the "Shared Library Manager PPC" extension are needed for OT to function properly on a PowerMac. 680x0 users only need this one.
窶｢ PM 窶｢窶｢窶｢Shared Library Manager PPC (v2.0) [NA]: supports loading, unloading, and sharing of native object-oriented code. Provides native support for Open Transport. Both this extension and the "Shared Library Manager" are needed for OT to function properly on a PowerMac, but 680x0 users do not need this one.
窶｢ Slow SCSI Extension: addresses a potential conflict between PowerBook 5300 series computers and slow SCSI devices (such as single-speed CD-ROM drives, Zip drives, and other PowerBooks in SCSI disk mode). Not all PowerBooks will experience this problem and even PowerBooks that do will not necessarily experience it on a consistent basis (even with different units of the same make and model). NOTE: You should only install this extension if you are experiencing constant freezes or crashes when transfering files with a particular slow SCSI device, since installing this extension will impact performance with ALL SCSI devices by 10 to 50 percent! You can use a startup manager to disable the extension when not needed.
窶｢ Sound Input Amplification: adds the "microphone amplification" option to the Sound control panel. Some microphones, such as the Apple PlainTalk microphone, produce a "line-level" signal which does not need amplification to be properly received by your computer's sound hardware. However, other microphones produce a "mic-level" signal which needs to be amplified. If you are using a microphone which produces a mic-level signal, you will need to turn microphone amplification ON.
窶｢ 窶｢窶｢窶｢Sound Manager 3.2.1 [0/96]: PowerMac native. Sound Manager 3.2 was incorporated into the System in System 7.5.3. Version 3.2 included asynchronous sound playback and better Power Mac performance. Version 3.2.1, which is a separate extension and is part of the QuickTime 2.5 package, supposedly provides even better low-memory performance and better multi-channel sound via a new sound clock component. However, it includes no new "features." If you disable version 3.2.1, the version (3.2) included in the System will be used instead. If you are not using System 7.5.3, you should install v3.2.1 to benefit from the added functionality of the 3.2.x Sound Managers (however, on a Quadra with a PowerPC card and System Software 7.5.1, you may need to update your System Software to 7.5.3 to use Sound Manager 3.2.x). Note that the QuickTime 2.5 installer will only "Easy Install" v3.2.1 if an older version is present, so be sure that you have your older Sound Manager extension present before you install, or else do a "custom" install.
窶｢ 窶｢窶｢窶｢Startup Tuner [NA]: part of the System 7.5.3 revision, fixes a problem with the Startup Disk control panel where the Mac may not startup from the selected disk. Supposedly only useful on the models for which the Revision is recommended (see Chapter 2)
窶｢ Text Preview: when using ClarisWork 4.0, and other compatible applications, shows previews of TEXT files in the preview window of the "open" dialog box.
窶｢ Thread Manager (v2.0.1): allows applications which use threads to perform multi-threading. Incorporated into the system starting with 7.5
窶｢ TokenTalk Phase 2 (v2.5.7): driver used by the Apple Token Ring card.
窶｢ TokenTalk Prep (v2.5.2): provides support for TokenTalk Phase II
窶｢ TrueType: needed by System 6.0.7 and all subsequent versions of System 6 to print TrueType fonts, as well as to display them on screen.
窶｢ Video Out Default (PAL) (v11.2): used by the Apple Video Player. On the standard U.S. System, the default video-out for the Apple Video Player is NTSC. Outside of the U.S., the standard video format is PAL; this extension changes the Apple Video Player default to PAL.
窶｢ 窶｢窶｢窶｢Video Startup (v1.4) [22/0]: provides support for the Apple Video Player; needed to use the AVP. NOTE: If you are going to install System 7.5 Update 2.0, first check the version number of both Video Startup and the Apple Video Player. During the installation, you may get a message that says something like "a newer version is already installed." However, chances are it really isn't, and you do need to install. If you did already have 1.4 installed, leave it. If you have a version prior to 1.4, ignore the installer's warning and install the "older" version. This is a bug in the 7.5 Update 2.0 installer. You should end up with v1.4. If not, you should go back and do a custom install of only the Apple Video Player software.
窶｢ ~AudioVision: part of the AudioVision 14" monitor software package. Only needed on pre-7.5 systems.
