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K Service Source
Power Macintosh 7100 Series
Power Macintosh 7100/66, 7100/66AV,
7100/80, 7100/80AV
K Service Source
Basics
Power Macintosh 7100 Series
Basics Power Macintosh System Overview - 1
Power Macintosh System Overview
PowerPC microprocessors are a family of processors built
on reduced instruction-set computing (RISC) technology.
RISC processors streamline the internal workings of
computers. Whereas traditional (complex instruction-set
computing, or CISC) processors contain a wide variety of
instructions to handle many different tasks, RISC
processors contain only those instructions that are used
most often. When a complex instruction is needed, a RISC
processor builds it from a combination of basic instructions.
RISC processors are designed to execute these basic
instructions extremely quickly. The performance gains
achieved by speeding up the most-used instructions more
than compensate for the time spent creating less-used
instructions.
Basics Power Macintosh System Overview - 2
Previously, RISC technology had been used only in high-end
workstations and commercial database servers. With the
introduction of Macintosh PowerPC computers, Apple
succeeded in bringing RISC technology to personal
computing.
Key Points
Three key points to remember about a PowerPC processor-
based Macintosh system: It's a Macintosh; it's compatible; it
offers tremendous performance.
Apple's PowerPC computers feature the same user interface
as their 680x0-based predecessors. Users can mix RISC-
based and 680x0-based Macintosh systems on the same net-
work and exchange files and disks between them. In addition,
users can run both 680x0 and native PowerPC applications
on the same Power Macintosh system simultaneously.
Basics Power Macintosh System Overview - 3
Compatibility is not limited just to applications. INITs,
CDEVs, drivers, and other Macintosh utility software also
work on PowerPC processor-based Macintosh systems. So do
AppleTalk devices (such as printers), SCSI devices (such as
hard drives and scanners), ADB devices (such as mice,
trackballs, and keyboards), and other Macintosh cards and
peripherals.
The primary operating system for PowerPC processor-
based Macintosh computers is System 7. The operating
system has been optimized for the highest performance on
the PowerPC processor. This optimization of System 7
benefits applications written for 680x0 systems as well as
those developed specifically for PowerPC processor-based
systems.
And while PowerPC-based Macintosh systems running
native applications offer two to four times the performance
Basics Power Macintosh System Overview - 4
of the fastest 68040- and 80486-based personal
computers, the real promise of PowerPC technology is that
it enables Apple and other developers to deliver new
software capabilities on Macintosh systems that were
previously available only on high-end workstations.
Troubleshooting Tips
When troubleshooting Power Macintosh systems, keep in
mind the following:
1 If a Power Macintosh system does not power up, you
should first attempt to reset the logic board. Instruc-
tions are provided in the Additional Procedures chapter.
2 With Power Macintosh computers, you must install
noncomposite RAM SIMMs only, and the RAM SIMMs
must be installed in like pairs (that is, the same size and
speed). Additional troubleshooting information is
Basics Power Macintosh System Overview - 5
provided in the Symptom Charts section of the
Troubleshooting chapter under the "System" topic
heading.
3 If a Power Macintosh system has bad RAM SIMMs
installed, you will not hear death chimes. Instead, a
dialog box will appear alerting you to the fact that a bad
RAM SIMM has been detected. Additional troubleshooting
information is provided in the Symptom Charts section
of the Troubleshooting chapter under the "System" topic
heading.
4 If the system hangs shortly after installing a new NuBus
card, contact the vendor to verify that the card is
compatible with the Power Macintosh system or to see if
there is a software upgrade available. If the NuBus card
is an Apple manufactured product, refer to the Service
Tech Info Library for more information.
Basics Power Macintosh System Overview - 6
5 The Power Macintosh AV systems use the same logic
board as the non-AV versions. The only difference is that
the AV versions have the Power Macintosh AV Card
installed in the PDS slot.
The Power Macintosh 7100/66 and 7100/80 systems
must have a video card installed in the PDS slot. These
systems use the Power Macintosh 2 MB Video Card. A
missing card can result in a system that won't boot or a
system that crashes.
Basics HDI-45 Pinouts - 7
HDI-45 Pinouts
This section includes an illustration of the HDI-45
connector and a table containing the pinout descriptions.
Figure: HDI-45 Connector on the Logic Board
Basics HDI-45 Pinouts - 8
Table: HDI-45 Pinouts
Pin Description
1 Analog audio ground
2 Audio input shield
3 Left channel audio input
4 Right channel audio input
5 Left channel audio output
6 Right channel audio output
7 Reserved
8 Monitor ID sense line 1
9 Monitor ID sense line 2
(continued)
Basics HDI-45 Pinouts - 9
Pin Description
10 Green ground (shield)
11 Green video output (75)
12 Video input power ground
13 Power for camera +5 V
14 Reserved
15 Reserved
16 Reserved
17 Reserved
18 Monitor ID sense line 3
19 S-video input shield
20 S-video input luminance (Y)
(continued)
Basics HDI-45 Pinouts - 10
Pin Description
21 S-video input chroma (C)
22 Reserved
23 Reserved
24 Reserved
25 Reserved
26 Red ground (shield)
27 Red video output (75)
28 I 2C data signal
29 I 2C clock signal
30 Reserved
31 Monitor ID
(continued)
Basics HDI-45 Pinouts - 11
Pin Description
32 Monitor ID
33 Vertical sync signal
34 Composite sync signal
35 ADB power +5 V
36 ADB ground
37 ADB data
38 Keyboard switch
39 Reserved
40 Reserved
41 Monitor ID
42 Horizontal sync signal
(continued)
Basics HDI-45 Pinouts - 12
Pin Description
43 Video sync ground
44 Blue ground (shield)
45 Blue video output (75)
Basics Rear Panel Connectors - 13
Rear Panel Connectors
The figure on the following page shows the rear panel of a
Power Macintosh 7100 computer with a 2 MB Video Card
installed. The AV version of the Power Macintosh 7100
would have a Power Macintosh AV Card installed instead of
the 2 MB Video Card. In addition to a DB-15 connector, the
AV Card includes an S-Video Input and an S-video Output
port.
Basics Rear Panel Connectors - 14
DB-15
Sound In
Ethernet Sound Out
Power On
SCSI ADB
HDI-45 Modem
Video Printer
Power Macintosh 7100 Rear Panel
Basics Logic Board Connectors - 15
Logic Board Connectors
The figure on the following page shows a Power Macintosh
7100 Series logic board.
Basics Logic Board Connectors - 16
DRAM SIMMs
Power
On/Off
Switch
SCSI
Ethernet
AV Display
Connector
Serial Ports
ADB
Sound In
Sound Out
601 L2 Cache 601 Soldered
PDS Slot DRAM
4 MB
ROM
Power Macintosh 7100 Logic Board
K Service Source
Specifications
Power Macintosh 7100 Series
Specifications Processor - 1
Processor
CPU Built-in MMU and FPU
32K of on-chip cache memory
7100/66: 66 MHz PowerPC 601 RISC microprocessor
Requires system software version 7.1.2 or later
7100/80: 80 MHz PowerPC 601 RISC microprocessor
Requires system software version 7.5 or later
Note: To run System 7.5 on the Power Mac 7100/80, you must
install enabler version 1.1.1 or later. This version of the
system software, which ships with the unit, requires Finder
version 7.1.5. You can verify that you have the correct Finder
version installed by using the "Get Info" command.
Specifications Memory - 2
Memory
RAM 8 MB RAM soldered on logic board, expandable to 136 MB via 4
SIMM sockets on logic board (using pairs of same size, 80 ns
or faster, 72-pin noncomposite SIMMs); 16 MB configuration
has two 4 MB SIMMs installed
Note: SIMMs must be installed in pairs of the same size and
speed. Install noncomposite SIMMS only.
ROM 4 MB installed on SIMM socket
Specifications Memory - 3
VRAM
7100/66 & 7100/80: 1 MB, expandable to 2 MB using four 256K VRAM SIMMs
7100/66AV & 2 MB
7100/80AV:
Cache
7100/66: 32K of on-chip cache; optional 256K level 2 cache available
7100/80: 32K of on-chip cache; 256K level 2 cache standard
Clock/calendar CMOS custom chip with long-life lithium battery
Specifications Disk Storage - 4
Disk Storage
Hard Drive
7100/66: 250 MB or 500 MB hard drive
7100/80: 500 MB or 700 MB hard drive
CD-ROM
7100/66: Optional internal CD-ROM drive
7100/66AV: Internal AppleCD 300i Plus CD-ROM drive
7100/80 & 7100/ Internal AppleCD 300i Plus CD-ROM drive standard on some
80AV: models and optional on others
Specifications Disk Storage - 5
Floppy Drive 1.4 MB Apple SuperDrive Manual Insert
Specifications I/O Interfaces - 6
I/O Interfaces
SCSI One SCSI port; DB-25 connector
Supports a maximum of six external devices (five when internal
CD-ROM is installed)
Serial Two RS-232/RS-422 LocalTalk/GeoPort serial ports; mini DIN-
9 connectors (backward compatible with mini DIN-8
connectors)
Apple Desktop Bus One Apple Desktop Bus (ADB) port; mini-Din-4 connector
Maximum power draw 500 mA; maximum of three devices total
Ethernet One built-in AUUI-15 Ethernet port
Specifications I/O Interfaces - 7
Expansion Slot One processor-direct slot (PDS); 182-pin connector
NuBus Three NuBus slots support standard size cards; 96-pin Euro-DIN
connectors
Sound 16-bit stereo in and out
Sample rates of 48, 44.1, 24, and 22.05 kHz
Input/output line level: 1 V peak-to-peak
Input/output signal-to-noise ratio (SNR): 82 dB with no audible
discrete tones
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