Apple PowerBook File Assistant Manual de usuario descargar pdf (Pagina 13)

Extensions

http://www.AmbrosiaSW.com/DEF/PP/ext.html Friday, September 5, 1997

Quadra AV Monitors Extension: same as above, only for Quadra AV- and Centris AV-series computers, so it includes the AV video display

options.

QuickDraw GX: enables the QuickDraw GX printing system. Note that if this extension is installed, you must have GX-compatible printer

drivers. Non-GX drivers will not even show up in the Chooser.

Record Button: provides support for the "record" button on the Apple Adjustable Keyboard. Now incorporated into the AV and PowerMac

series' ROMs.

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).

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 language. This extension is only required when using

a script that incorporates them.

SCSI Manager 4.3 / SCSI Manager 4.3.1: the new SCSI Manager (4.3.x) system added several new features (such as SCSI 2 compliance,

concurrent asynchronous I/O, and disconnect and reconnect) to the Mac's SCSI architecture. There is a lot of conflicting information out

there about these extensions. Even Apple's own Tech Info Library gives contradictory explanations. The following is the best summary I

can offer (and it is admittedly confusing): Version 4.3 is part of the ROMs on all Power Macintosh and Quadra AV computers, and is

installed as a separate extension by the System 7.5 CD, even on these machines which already have it in ROM. It is incorporated into the

System under System 7.5.3 and later. So anyone running System 7.5.3 or later should not have any version of this extension installed. The

new (4.3/4.3.1) SCSI system is supposedly supported on all PowerPC and 68040 Macs, except for the 630 series and 68040 PowerBooks

(including Duos). If your computer doesn't require this extension, you should probably delete it. (In yet another source of confusion, one

Apple article claims that having the extension installed when not needed can cause serious problems, while another said that it would not do

any harm. This is clearly a situation where too many people at Apple are trying to explain something that none of them knows enough

about!) The remaining info is only for people not running System 7.5.3 or later: Non-QuadraAV 68040 Macintosh computers require the

SCSI Manager 4.3 extension under System 7.5, or the SCSI Manager extension under System 7.5.1. The SCSI Manager 4.3.1 extension

from System 7.5 Update 1.0 contains software fixes needed only on 68040-based Macintosh computers and the PowerPC Upgrade Card.

Even though Apple claims that the new SCSI system is not supported on 630-series and PowerBooks, they also say that version 4.3.1 of

the extension is needed on 630 machines, the PowerBook 150, and the Quadra AV models to fix possible data corruption problems. It is

also supposedly used on those computers to fix a potential crash problem with some (unspecified) external hard drives.

SerialDMA 2.0.2 [17.5/?]: first, a note on the DMA chip: a computer's processor supervises the transfer of data between memory and

connected devices. This takes time away from other processor functions. PowerMacs and the AV Macs have what are called direct memory

access (DMA) chips, which handle some or all of this data transfer processing. 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

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Apple PowerBook File Assistant Manual de usuario Pagina 13