Memory

RAM 8 MB standard (one 8 MB SIMM), expandable to 128 MB 72-pin SIMMs Requires CAS-before-RAS 60 ns access time 1 MB Standard, expandable to 2 MB (80 ns or faster 256K VRAM SIMMs) Maximum pixel depths for 1 MB 2 MB VRAM 12-inch color (51 2 x 384) - 1 6 1 6 bits per pixel 12-inch monochrome (640 x 480) - 16 16 bits per pixel 13-inch color (640 x 480) - 8 16 bits per pixel 15-inch portrait (640 x 870) - 4 8 bits per pixel 16-inch color (832 x 624) - 8 1 6 bits per pixel 19-inch color (1024 x 768)...

Processor

Motorola 68040 microprocessor 40 MHz Built-in paged memory management unit (PMMU), floating-point unit (FPU), and 8K memory cache 32-bit registers 32-bit address data bus A Peripheral Subsystem Controller (PSC) provides direct memory access (DMA) between the 68040 buses and peripheral devices. AT& T DSP3210 32-bit floating-point digital signal processor Supports real-time tasks such as speech recognition, audio compression, and analog modem signal processing.

Logic Board

Caution Review the ESD precautions in Bulletins Safety. Warning If handled or discarded improperly, the lithium battery in the Quadra 840AV could explode. Review battery handling and disposal instructions in Bulletins Safety. Note Whenever you have a unit that fails to power up, you should follow this procedure to reset the logic board before replacing any modules. 2 Using a small flat-blade screwdriver, pry open the latch at the end of the battery holder and lift off the cover. 3 Grasp the...

Floppy Drive

Caution Review the ESD precautions in Bulletins Safety. 1 Press down the retaining clip securing the floppy drive and slide the floppy drive forward about 2 inches. 2 Disconnect the floppy drive cable from the floppy drive. 3 Remove the floppy drive from the chassis. Replacement Note Install dust shields on 1.4 MB drives in the Quadra 840AV. All 1.4 MB replacement drives ship with the dust shield already installed.

IO Interfaces

Serial Two RS-232 RS-422 ports (modem port is an Apple high Modem port mini DIN-9 connector (also supports mini DIN-8 connector) 0.920 mbit sec. if external clock source is provided (modem interface only) Asynchronous and synchronous communications supported up to 9600 baud GeoPort (Modem High-performance serial port Port) Supports connection to analog, PBX, ISDN, facsimile (fax), and data telephone lines Provides full-duplex telephone I O at up to 14.4 Kbps Supports AppleTalk and V.22,...

Power Macintosh Upgrade

The Power Macintosh 8500 Upgrade Kit can be used to upgrade a Quadra 800, Quadra 840, or a Power Macintosh 8100. The kit includes everything except The peripherals (such as the hard drive, floppy drive, and CD-ROM drive), which must be transferred from the original unit you are upgrading A processor card, which must be purchased separately. Refer to the appropriate Take Apart chapter (that is, the Take Apart chapter in the Quadra 800, Quadra 840AV, or Power Macintosh 8100 manual) for...

Battery Replacement

Before you begin, remove the following Caution Review the ESD precautions in Bulletins Safety. Awarning If handled or discarded improperly, the battery could explode. Review battery handling and disposal instructions in Bulletins Safety. Using a small flat-blade screwdriver, pry open the latch at the end of the battery holder and lift off the cover. 2 Grasp the battery and remove it from the holder. 3 Return the battery to Apple for proper disposal. For battery packaging and labeling...

CDROM Upgrade

Caution Review the ESD precautions in Bulletins Safety. 1 Remove the upper blank bezel from the top cover. 2 Install the slotted CD-ROM drive bezel in the top cover. 3 Attach the CD-ROM carrier to the CD-ROM drive with four Phillips screws. 4 Verify that the two jumper connectors are installed as shown. Important These jumpers configure the SCSI device address of the CD-ROM drive. The CD-ROM drive will have a SCSI device ID of 2. Verify that no other SCSI device installed in the computer...