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Macintosh Quadra 840AV and Macintosh Centris 660AV
July 29, 1993
Prepared by Noah Price, Hardware Design Team (noah@apple.com)
Contributions from Fernando Urbina, Software Team (nano@apple.com)
------------------------------------------------------------------------
Comparison of AV models
------------------------------------------------------------------------
Macintosh Macintosh
Centris 660AV Quadra 840AV
====================== ======================
Enclosure Same as Centris 610 Same as Quadra 800
Processors
----------
CPU Motorola MC68040RC Motorola MC68040RC
CPU Speed 25 MHz 40 MHz
Hardware Floating Point Included Included
DSP AT&T DSP3210 AT&T DSP3210
DSP Speed 55.5 MHz 66.6667 MHz
Main Memory
-----------
Onboard DRAM 4 MBytes none
Expansion DRAM SIMMs Two 72-pin SIMMs (1) Four 72-pin SIMMs (1)
Maximum DRAM capacity 68 MBytes 128 MBytes
Expansion DRAM Speed 70 ns 60 ns
Video & Graphics
----------------
Onboard VRAM 1 MB 1 MB
Expansion VRAM SIMMs none 1 MB (Four 256K SIMMs)
Expansion VRAM Speed n/a 80 ns
Expansion
---------
NuBus 1 slot (2) 3 slots
DAV (3) 1 connector (2) 1 connector
Power
-----
Power Supply 85 W 200 W
Trickle Power none Yes (4)
Power Control Hard power Soft power (5)
Monitor Outlet Unswitched Switched
NOTES:
(1) Both models use 32-bit wide 72-pin SIMMs. For electrical loading
and timing reasons, composite SIMMs are not supported.
(2) The NuBus slot and DAV connector are optional on the Centris 660AV.
A NuBus adapter card, similar to the adapter for the Centris 610,
must be added. This card provides a single NuBus slot in line
with a DAV connector. Like the Centris 610, the Centris 660AV is
designed to accomodate a 7" NuBus card.
(3) DAV - Digital Audio Video connector. The DAV connector is in line
with a NuBus slot, and provides digital video in YUV format and
digital audio.
(4) Trickle Power is a +5V supply that is present whenever the
computer is plugged in. When available, it is automatically used
instead of the battery to maintain parameter RAM. Trickle power
is also provided to NuBus, per NuBus 90, and to GeoPort for use in
an external telephone interface.
(5) Soft power control has been enhanced. The Quadra 840AV may be
turned on or off from either the keyboard power switch (which puts
up a confirmation dialog before shutting down) or the front panel
switch. Software control of on/off features is now available in
the "Auto Power On/Off" control panel. This includes
automatically turning the computer on or off at a specified time,
and automatically powering back on after a power failure.
------------------------------------------------------------------------
I/O Features Overview
------------------------------------------------------------------------
Both AV models support Direct Memory Access (DMA). Serial (including
LocalTalk and GeoPort), 53C94 SCSI, Ethernet, floppy, and audio are
all supported with DMA drivers.
The version 4.3 SCSI Manager supports fully asynchronous SCSI
transactions with extensions to the Applications Programmer Interface
(API). A new SCSI driver is required on the hard drive for full
performance benefits. This driver may be installed on existing Apple
SCSI hard drives using the new HD SC Setup.
------------------------------------------------------------------------
Audio Features Overview
------------------------------------------------------------------------
Both AV models support 16-bit Stereo audio input and output. Hardware
sample rates include 48 KHz and CD standard 44.1 KHz.
Output Port Mini-stereo jack, line level
Input port Mini-stereo jack (plus power), line level
Internal CD Audio 4-pin stereo header
------------------------------------------------------------------------
Video Features Overview
------------------------------------------------------------------------
Video Output RGB (DB-15 connector)
Composite (RCA connector)
S-Video (4-pin mini-DIN connector)
Video Output Formats RGB, NTSC or PAL
("SECAM" TVs can be supported with an adapter
on the RGB output using PAL timing.)
NTSC/PAL "Flicker Free" Yes (up to 8 bpp, without video-in)
(Convolution)
Video Input Composite (RCA connector)
S-Video (7-pin mini-DIN with power and IIC
control, compatible with 4-pin mini-DIN)
Video Input Formats NTSC, PAL or SECAM
Largest Monitor 21" (1152 x 870)
Max Graphics Bit Depth 32 bits/pixel (see details per model below)
Video Play-through
Bit Depths 8 bits/pixel greyscale or 16 bits/pixel color
------------------------------------------------------------------------
Video Output Display Support
------------------------------------------------------------------------
The AV models support a wide range of monitors. The built-in monitor
support is detailed in the table below. For the AV models, video-in
refers live video from one of the input jacks, video out refers to
live video playthrough, and graphics refers to traditional Macintosh
generated video output (windows, desktop, etc.).
To accomodate displaying live video in a window with graphics, both
models have a split frame buffer architecture. Video-in uses one-half
of the video memory and graphics uses the other half. To achieve the
highest graphics bit depth, the two halves are often used together for
graphics. Consequently, for many monitors video-in is not available
when displaying graphics at the highest bit depth. When displaying
live video, the two frame buffers are merged so the video-input
appears as a window on the graphics display.
Note that the bit depth for graphics may be different than the bit depth
for video. For example, on the 13" or 14" RGB display, you can display
up to 8-bit graphics when video-in is enabled. However, you can view a
16-bit video input window on this display at the same time.
The machines can drive an NTSC or PAL monitor directly, without the use
of an encoder box. In order for that feature to be enabled, the
display resolution should be either 512x384 or 640x480 for NTSC, or
640x480 or 768x576 for PAL. Hence the different resolutions available
for each display.
Notes:
1) The Macintosh Centris 660AV always has 1 MByte of VRAM.
2) The Macintosh Quadra 840AV comes standard with 1 MByte of VRAM
and may be expanded to 2 MBytes of VRAM. Four 80 ns 256K VRAM
SIMMs are required.
3) Where multiple resolutions are available, an asterisk (*) indicates
the standard resolution. Additional resolutions allow you to
display more colors by only using a portion of the monitor.
Select the resolution by using the Options dialog of the Monitors
Control Panel. You must reboot to change resolutions. The size
of the pixels will not change in these alternate modes. Instead,
a black border will appear around the smaller active video area.
4) A "Flicker-free" mode (sometimes referred to as Apple
Convolution) is available when displaying on a TV. This mode is
available at up to 8 bits/pixel and is not available when using
video-in.
5) bpp is Bits Per Pixel. A range is given in table below, indicating
which of the following are available:
1 bpp - Black & White
2 bpp - 4 colors or greys
4 bpp - 16 colors or greys
8 bpp - 256 colors or greys (greys only for Video in)
16 bpp - Thousands of colors (5 bits each of R, G, and B)
32 bpp - Millions of colors (8 bits each of R, G, and B)
6) Both the video and graphics portions of VRAM are often used
together to display graphics at the highest available bit depth.
In the table below, the range of graphics bit depths is marked
with # when video-in is available at the maximum graphics bit
depth. In all other cases video-in is not available when using
the highest graphics bit depth.
------------------------------------------------------------------------
1 MByte VRAM 2 MByte VRAM
================== ==================
Graphics Video-in Graphics Video-in
Display Resolution bpp bpp bpp bpp
----------------- ---------- -------- -------- -------- --------
12" RGB 512x384* 1-32 8-16 1-32 8-16
560x384 1-32 8-16 1-32 8-16
13" or 14" RGB 512x384 1-32 8-16 1-32 8-16
& 12" Monochrome 640x400 1-32 8-16 1-32 8-16
640x480* 1-16 8-16 1-32 8-16
15" Portrait 512x384 1-8# 8-16 1-8# 8-16
Full-Page Monochrome 640x480 1-8# 8-16 1-8# 8-16
640x870* 1-8 8-16 1-8# 8-16
15" Portrait 640x870* 1-8 8-16 1-16 8-16
Full-Page RGB
16" RGB 512x384 1-32 8-16 1-32 8-16
640x480 1-16 8-16 1-32 8-16
768x576 1-16 8-16 1-32 8-16
832x624* 1-16 8-16 1-32 8-16
19" RGB 1024x768* 1-8 8 1-16 8
21" Two-Page 512x384 1-8# 8 1-8# 8
Monochrome 640x480 1-8# 8 1-8# 8
768x576 1-4# 8 1-4# 8
1152x870* 1-8 8 1-8# 8
21" Two Page RGB 512x384 1-16 8 1-16 8
640x480 1-16 8 1-16 8
768x576 1-4# 8 1-4# 8
1152x870* 1-8 8 1-16 8
VGA/SVGA Displays 640x480* 1-16 8-16 1-32 8-16
56Hz 800x600 1-16 8-16 1-32 8-16
72Hz 800x600 1-16 8-16 1-32 8-16
60Hz 1024x768 1-8 8 1-16 8
70Hz 1024x768 1-8 8 1-16 8
Composite and S-Video Output Modes:
NTSC convolved (flicker-free mode)
Underscan (Safetitle) 512x384 1-8 NA 1-8 NA
Overscan (Fullframe) 640x480* 1-8 NA 1-8 NA
NTSC non-convolved
Underscan (Safetitle) 512x384 1-32 8-16 1-32 8-16
Overscan (Fullframe) 640x480* 1-16 8-16 1-32 8-16
PAL convolved (flicker-free mode)
Underscan (Safetitle) 640x480 1-8 NA 1-8 NA
Overscan (Fullframe) 768x576* 1-8 NA 1-8 NA
PAL non-convolved
Underscan (Safetitle) 640x480 1-16 8-16 1-32 8-16
Overscan (Fullframe) 768x576* 1-16 8-16 1-32 8-16
* Default resolution. See note 3 above.
# Video-in is availble at the highest graphics bit depth.
See note 6 above.
------------------------------------------------------------------------
Comments
------------------------------------------------------------------------
Please refer comments about this document to Noah Price at one of the
following electronic addresses, listed in order of preference (that
is, how frequently they're checked!).
Internet............ noah@apple.com
AppleLink........... NOAH.P
America Online...... NoahPrice
CompuServe.......... 72040,355
GEnie............... NOAH.P
Please understand that I may not be able to respond to everyone
individually. However, comments or questions may be incorporated in
future revisions.
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