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Macintosh IIsi Technical
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1990-10-18
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Macintosh IIsi Technical Specifications
Copyright 1990, Apple Computer, Inc.
The 68030 microprocessor runs at 20 megahertz and features a built-in Memory
Management Unit (MMU). The MMU supports the A/UX operating system and provides
the capabilities necessary to support virtual memory, a new feature of
Macintosh system software version 7.0. Virtual memory lets you work with more
applications without the need for large amounts of DRAM by setting up sections
on the hard disk for easy memory swapping. There are 256-byte data and
instruction caches that accelerate overall system performance by eliminating
one wait state that occurs with the 68020 processor.
Customers who work routinely with software such as sophisticated CAD/CAM and
graphics applications may want to add the Motorola 68882 floating-point math
coprocessor to their systems. The 68882 optimizes the computer's performance
during math-intensive calculations.
The Macintosh IIsi comes with 1 megabyte of RAM on the main logic board. Up to
16 megabytes of RAM can be added by installing Single in-line Memory Modules
(SIMMs). Some possible configurations include:
-- 2 megabytes (1 megabyte on main logic board; four 256K SIMMs)
-- 3 megabytes (1 megabyte on main logic board; four 512K SIMMs)
-- 5 megabytes (1 megabyte on main logic board; four 1-megabyte SIMMs)
-- 9 megabytes (1 megabyte on main logic board; four 2-megabyte SIMMs)
-- 17 megabytes (1 megabyte on main logic board; four 4-megabyte SIMMs)
The Macintosh IIsi uses 100-nanosecond (or faster) fast-paged mode RAM.
A ROM SIMM socket on the logic board provides an easy ROM upgrade path.
One NuBus card or 030 Direct Slot card can be added to the Macintosh IIsi by
connecting it to a Macintosh IIsi adapter card (sold separately). NuBus
provides a multiplexed, 32-bit address bus and data bus on a single 96-pin
connector. The NuBus architecture supports data transfer rates up to 3.75
megabytes per second. The 030 Direct Slot provides a 32-bit slot directly to
the microprocessor via a 120-pin connector. This slot is compatible with
expansion cards available for the Macintosh SE/30 personal computer. The
Motorola 68882 floating-point math coprocessor is on the adapter cards.
The SCSI (Small Computer System Interface) is an interface bus used to connect
hard disks and other SCSI-based devices, such as the AppleCD SC CD-ROM drive,
and Apple Scanner, and the Apple Personal LaserWriter to the Macintosh IIsi.
This interface can support up to seven SCSI peripheral devices.
The Macintosh IIsi provides full ROM support for all AppleTalk protocols, and
includes built-in serial ports for LocalTalk network connections.
Macintosh system software includes:
-- System software version 6.0.6 or later (the Macintosh Operating System)
with System Startup disk.
-- System Additions disk (includes utilities such as the Apple File Exchange,
HD SC Setup, CloseView, Disk First Aid, and Font/DA Mover).
HyperCard 2.0 Home, Addresses with Audio, Appointments with Audio, Audio
Palette, and Audio Help stacks are included. A/UX version 2.0.1 (optional) is
compatible with the Macintosh IIsi.
The Macintosh IIsi has been designed to accept and process sound as well as
generate it. Using a microphone or phono jack adapter, and appropriate
software, you can speak into the computer to create electronic voice messages
and add voice comments to files. Sound entering the computer is monaural,
8-bit sound. It is filtered through a custom filter/preamplifier chip,
converted to digital form, and stored in DRAM or directly on the hard disk. An
Apple electret microphone and phono jack adapter are included.
Microprocessor
-- MC68030, 32-bit architecture (includes built-in Memory Management Unit)
-- 20-megahertz clock speed
-- Two 256-byte, built-in instruction and data caches
Coprocessor (optional)
-- MC68882 floating-point math coprocessor
-- 20-megahertz clock speed (IEEE Standard 80-bits precision)
Memory
-- 1 megabyte of on-board RAM, expandable to 17 megabytes
-- 512K of ROM, with ROM SIMM access for future upgrades
-- 256 bytes of parameter memory
Disk Drives
-- Built-in Apple SuperDrive 1.4-megabyte floppy disk drive (optional external
1.4-megabyte or 800K disk drive available)
-- Internal Apple SCSI hard disk drive (1/3 height, 40 or 80 megabytes)
-- Optional external Apple SCSI hard disk (many capacities available)
Monitors
-- Supports for Apple color and monochrome monitors as well as some
third-party monitors, including:
- Macintosh 12" RGB Display: up to 256 colors, 512 by 384 pixels
- AppleColor High-Resolution RGB Monitor: up to 256 colors, 640 by 480
pixels
- Macintosh 12" Monochrome Display: up to 256 shades of gray, 640 by 480
pixels
- Apple Macintosh Portrait Display: up to 16 shades of gray, 640 by 870
pixels
-- When equipped with a video expansion card, supports other Apple and
non-Apple monitors
Interfaces
-- One Apple Desktop Bus (ADB) port, supporting a keyboard, mouse, and other
devices daisy-chained through a low-speed, synchronous serial bus (a maximum of
three chained devices is recommended)
-- One DB-15 video port, supporting color and monochrome monitors of various
sizes and resolution
-- Two serial (RS-232/RS-422) ports, 230 kilobits per second maximum (up to
0.920 megabits per second if clocked externally)
-- SCSI interface using a 50-pin internal connector and a DB-25 connector for
the first external device; all subsequent SCSI-based peripheral devices use
standard SCSI-to-SCSI interface cables
-- Internal expansion slot, supporting a NuBus or an 030 Direct Slot expansion
card
-- External 3.5-inch floppy disk drive (800K or 1.4-megabyte) interface
-- Stereo sound output port for external audio devices
-- Sound input port for monaural sound input
Sound Input
-- Monaural 8-bit sound
-- Sound samples can be made at 22 or 11 kilohertz.
-- Macintosh Audio Compression Expansion (MACE) sound utility supporting 3:1
or 6:1 compression, which allows up to 3 hours of sound to be stored on a
single 40-megabyte hard disk
Microphone
-- "Hands free" omnidirectional electret microphone
Sound Generator
-- Apple's custom digital sound chip provides 8-bit stereo sampling at 44.1
kilohertz, and includes four-voice wave-table synthesis - capable of driving
stereo headphones or other stereo equipment through the sound jack.
Mouse
-- Apple Desktop Bus Mouse; mechanical tracking: optical shaft or contact
encoding; 100 + or - 10 pulses per in. (3.9 + or - 0.39 pulses per mm) of
travel
Clock/Calendar
CMOS custom chip with long-life lithium battery
Electrical requirements
-- Line voltage: 120 volts AC, RMS
-- Frequency: 47 to 63 hertz, single phase
-- Power: 100 watts maximum
ADB Power Requirements
-- Maximum power draw for all ADB devices: 500 milliamps (a maximum of three
ADB devices, daisy-chained to the port, is recommended)
-- Mouse draws 80 milliamps.
-- Keyboard draws 25 to 80 milliamps (varies with keyboard model used) (the
practical total of ADB devices is three daisy-chained to the port).
Main Unit Size and Weight
-- Height: 4 in. (10 cm)
-- Width: 12.4 in (31 cm)
-- Depth: 14.9 in. (37.2 cm)
-- Weight: 10 lb. (4.5 kg)
Mouse Size and Weight
-- Height: 1.1 inches (2.8 cm)
-- Width: 2.1 inches (5.3 cm)
-- Depth: 3.8 inches (9.7 cm)
-- Weight: 6 ounces (.17 kg)
Operating Environment
-- Operating temperature: 50 to 104 degrees F (10 to 40 degrees C)
-- Storage temperature: -40 to 116.6 degrees F (-40 to 47 degrees C)
-- Relative humidity: 5% to 95%, noncondensing
-- Maximum altitude: 10,000 ft. (3048 m)
Macintosh IIsi 2/40 Order Number M0363LL/A
Macintosh IIsi 5/80 Order Number M0364LL/A
New Prod Highlights
10-15-90