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K Service Source
Macintosh Quadra 840AV
K Service Source
Specifications
Macintosh Quadra 840AV
Specifications Processor - 1
Processor
CPU Motorola 68040 microprocessor
40 MHz
Built-in paged memory management unit (PMMU), floating-point
unit (FPU), and 8K memory cache
Addressing 32-bit registers
32-bit address/data bus
Direct Memory A Peripheral Subsystem Controller (PSC) provides direct
Access (DMA) memory access (DMA) between the 68040 buses and
peripheral devices.
Specifications Processor - 2
Digital Signal AT&T DSP3210 32-bit floating-point digital signal processor
Processor (DSP) Supports real-time tasks such as speech recognition, audio
compression, and analog modem signal processing.
Specifications Memory - 3
Memory
RAM 8 MB standard (one 8 MB SIMM), expandable to 128 MB
72-pin SIMMs
Requires CAS-before-RAS
60 ns access time
ROM 2 MB soldered on logic board
PRAM 256 bytes of parameter memory
Specifications Memory - 4
VRAM 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 (512 x 384) - 16 / 16 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 / 16 bits per pixel
19-inch color (1024 x 768) - 4 / 8 bits per pixel
21-inch monochrome (1152 x 870) - 4 / 8 bits per pixel
21-inch color (1152 x 870) - 4 / 8 bits per pixel
VGA (640 x 480) - 8 / 16 bits per pixel
SVGA (800 x 600) - 8 / 16 bits per pixel
Clock/Calendar Apple custom chip with long-life lithium battery
Specifications Disk Storage - 5
Disk Storage
Floppy Drive Internal, 1.4 MB Apple SuperDrive
Hard Drive Internal, 3.5 in. hard drive (230, 500, 1000 MB) optional
CD-ROM Drive Internal, CD-300 mechanism optional
Specifications I/O Interfaces - 6
I/O Interfaces
Serial Two RS-232/RS-422 ports (modem port is an Apple high-
performance serial port)
Printer port: mini DIN-8 connector
Modem port: mini DIN-9 connector (also supports mini DIN-8
connector)
230.4 Kbaud maximum
0.920 mbit/sec. if external clock source is provided (modem
interface only)
Asynchronous and synchronous communications supported up to
9600 baud
Specifications I/O Interfaces - 7
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, V.22bis, V.29, and V.32 modem
protocols
Supports Apple HiPPort protocols
Video One monitor port; DB-15 connector
Supports Apple monitors (up to 16-bits), VGA monitors, and
NTSC and PAL video standards
S-Video Input & One S-video output port; one S-video input port; mini DIN-4
Output connectors
Supports input/output in NTSC, PAL, and SECAM formats
Specifications I/O Interfaces - 8
Composite Video One composite video output port; one composite video input port;
Input & Output RCA phono plug connectors
Supports input/output in NTSC, PAL, and SECAM formats
Ethernet One Ethernet port; AUI-15 connector
Floppy Disk Supports one internal 1.4 MB Apple SuperDrive
Supports industry-standard 765 or Apple group code recording
(GCR) formats
SCSI One SCSI port; DB-25 connector
Supports a maximum of eight devices (including the computer,
which is always device 7)
Transfers data at a maximum rate of 5 Mbps (synchronous)
Automatic termination of internal and external SCSI buses
Specifications I/O Interfaces - 9
NuBus Three slots; 96-pin Euro-DIN connectors
Supports standard-size cards, block transfers, burst-mode
transfers, a processor write buffer, power control service,
and NuBus `90 data transfers between cards at 20 MHz
One slot supports NuBus cards that contain a Digital Audio and
Video (DAV) connector
Expansion One 68040 processor-direct slot (PDS); 140-pin connector
Specifications I/O Interfaces - 10
Audio One 16-bit stereo output port; one 16-bit stereo input port; mini
phone-jack connectors
Sample rates up to 48 kHz (44.1 kHz standard rate)
Uses the digital signal processor (DSP) chip
Supports stereo audio from internal CD drive and Apple PlainTalk
microphone
Audio input port characteristics: 26K ohms impedance, 2 V rms
maximum, 22.5 dB gain
Audio output port characteristics: 37 ohms impedance, 0.9 V rms
maximum, attenuated