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The '''Macintosh IIsi''' is a desktop personal computer designed, manufactured, and sold by Apple Computer, Inc. from October 1990 to March 1993.<ref>{{cite web |url=https://support.apple.com/en-us/112193 |title=Macintosh IIsi: Technical Specifications |publisher=Apple Inc. |access-date=2026-02-09}}</ref> Introduced as a lower-cost alternative to the [[Macintosh IIci]], the IIsi was positioned as Apple's entry-level professional Macintosh, offering more expandability and performance than the [[Macintosh LC]] which was introduced simultaneously.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_ii/specs/mac_iisi.html |title=Macintosh IIsi Specs |publisher=EveryMac.com |access-date=2026-02-09}}</ref>
The '''Macintosh IIsi''' is a desktop personal computer designed, manufactured, and sold by Apple Computer, Inc. from October 1990 to March 1993.<ref>{{cite web |url=https://support.apple.com/en-us/112193 |title=Macintosh IIsi: Technical Specifications |publisher=Apple Inc. |access-date=2026-02-09}}</ref> Introduced as a lower-cost alternative to the [[Macintosh IIci]], the IIsi was Apple's entry-level professional Macintosh, with more expandability than the [[Macintosh LC]] which launched the same day.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_ii/specs/mac_iisi.html |title=Macintosh IIsi Specs |publisher=EveryMac.com |access-date=2026-02-09}}</ref>


The IIsi was notable for being the first Macintosh with built-in audio recording capabilities, featuring an integrated microphone input.<ref>{{cite web |url=https://lowendmac.com/1990/mac-iisi/ |title=Mac IIsi |publisher=Low End Mac |access-date=2026-02-09}}</ref> The compact desktop case design was unique to the IIsi and was not used for any other Macintosh model.
The IIsi was the first Macintosh with built-in audio recording, featuring an integrated microphone input.<ref>{{cite web |url=https://lowendmac.com/1990/mac-iisi/ |title=Mac IIsi |publisher=Low End Mac |access-date=2026-02-09}}</ref> The compact desktop case was unique to the IIsi and not used for any other Macintosh model.


== Architecture and Processor ==
== Architecture and Processor ==


The Macintosh IIsi is powered by a '''Motorola MC68030''' microprocessor running at 20 MHz.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIsi |title=Macintosh IIsi |publisher=Wikipedia |access-date=2026-02-09}}</ref> The processor features:
The Macintosh IIsi uses a '''Motorola MC68030''' microprocessor running at 20 MHz.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIsi |title=Macintosh IIsi |publisher=Wikipedia |access-date=2026-02-09}}</ref>


* '''32-bit internal registers''' with 32-bit data path
* '''32-bit internal registers''' with 32-bit data path
Line 34: Line 34:
* '''No Level 2 cache'''
* '''No Level 2 cache'''


The system bus operates at 20 MHz. Apple intentionally underclocked the IIsi's components from 25 MHz to 20 MHz to avoid competing with the more expensive IIci. Many users subsequently modified ("chipped") their IIsi to run at 25 MHz or even 28 MHz for improved performance.<ref>{{cite web |url=https://lowendmac.com/1990/mac-iisi/ |title=Mac IIsi |publisher=Low End Mac |access-date=2026-02-09}}</ref>
The system bus runs at 20 MHz. Apple underclocked the IIsi from 25 MHz to 20 MHz to avoid cannibalizing sales of the more expensive IIci. Many users modified ("chipped") their IIsi to run at 25 MHz or 28 MHz.<ref>{{cite web |url=https://lowendmac.com/1990/mac-iisi/ |title=Mac IIsi |publisher=Low End Mac |access-date=2026-02-09}}</ref>


=== Floating Point Unit ===
=== Floating Point Unit ===


The Motorola 68882 FPU is an optional upgrade, not included on the logic board. The FPU must be installed via the Apple NuBus Adapter card, which plugs into the Processor Direct Slot and converts it to a NuBus slot while simultaneously providing the FPU socket.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_ii/specs/mac_iisi.html |title=Macintosh IIsi Specs |publisher=EveryMac.com |access-date=2026-02-09}}</ref>
The Motorola 68882 FPU is optional and not included on the logic board. The FPU installs via the Apple NuBus Adapter card, which plugs into the Processor Direct Slot and converts it to a NuBus slot while providing the FPU socket.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_ii/specs/mac_iisi.html |title=Macintosh IIsi Specs |publisher=EveryMac.com |access-date=2026-02-09}}</ref>


== Memory ==
== Memory ==
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* '''Supported SIMM Sizes''': 256 KB, 512 KB, 1 MB, 2 MB, 4 MB (8 MB and 16 MB SIMMs work but are not officially supported)
* '''Supported SIMM Sizes''': 256 KB, 512 KB, 1 MB, 2 MB, 4 MB (8 MB and 16 MB SIMMs work but are not officially supported)


The IIsi's 1 MB of soldered RAM cannot be removed or disabled. When calculating total RAM, this 1 MB must be added to the SIMM capacity.<ref>{{cite web |url=https://support.apple.com/en-us/112193 |title=Macintosh IIsi: Technical Specifications |publisher=Apple Inc. |access-date=2026-02-09}}</ref>
The IIsi's 1 MB of soldered RAM cannot be removed or disabled. When calculating total RAM, add this 1 MB to the SIMM capacity.<ref>{{cite web |url=https://support.apple.com/en-us/112193 |title=Macintosh IIsi: Technical Specifications |publisher=Apple Inc. |access-date=2026-02-09}}</ref>


=== ROM ===
=== ROM ===
Line 64: Line 64:
== Video ==
== Video ==


The Macintosh IIsi uses an integrated video system that shares main system RAM for video memory, which reduces available RAM and impacts performance.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIsi |title=Macintosh IIsi |publisher=Wikipedia |access-date=2026-02-09}}</ref>
The Macintosh IIsi uses integrated video that shares main system RAM, reducing available RAM and impacting performance.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIsi |title=Macintosh IIsi |publisher=Wikipedia |access-date=2026-02-09}}</ref>


=== Video Specifications ===
=== Video Specifications ===
Line 74: Line 74:
* '''Portrait Monitor Support''': 640 × 870 at 4-bit (16 grays)
* '''Portrait Monitor Support''': 640 × 870 at 4-bit (16 grays)


Because video shares system memory, and specifically uses the slow 1 MB of soldered RAM first, video performance is notably slower than dedicated VRAM systems. A workaround involves setting the disk cache to 768 KB or larger, forcing video operations to use the faster SIMM RAM instead.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIsi |title=Macintosh IIsi |publisher=Wikipedia |access-date=2026-02-09}}</ref>
Video uses the slow 1 MB of soldered RAM first, making video performance slower than dedicated VRAM systems. Setting the disk cache to 768 KB or larger forces video operations to use the faster SIMM RAM instead.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIsi |title=Macintosh IIsi |publisher=Wikipedia |access-date=2026-02-09}}</ref>


== Audio ==
== Audio ==


The Macintosh IIsi was the first Macintosh to include built-in audio input capabilities.<ref>{{cite web |url=https://lowendmac.com/1990/mac-iisi/ |title=Mac IIsi |publisher=Low End Mac |access-date=2026-02-09}}</ref>
The Macintosh IIsi was the first Macintosh with built-in audio input.<ref>{{cite web |url=https://lowendmac.com/1990/mac-iisi/ |title=Mac IIsi |publisher=Low End Mac |access-date=2026-02-09}}</ref>


* '''Audio Output''': 8-bit stereo, 22 kHz
* '''Audio Output''': 8-bit stereo, 22 kHz
Line 86: Line 86:
* '''Internal Speaker''': Mono speaker on daughterboard
* '''Internal Speaker''': Mono speaker on daughterboard


The IIsi is known to develop sound issues over time due to its modular construction. The internal speaker is mounted on a daughterboard with spring contacts that connect to the logic board. Speaker vibrations can cause fretting of the contact surfaces, resulting in intermittent audio dropouts. This can be remedied by cleaning the contacts with a pencil eraser.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIsi |title=Macintosh IIsi |publisher=Wikipedia |access-date=2026-02-09}}</ref>
The IIsi develops sound issues over time due to its modular construction. The internal speaker mounts on a daughterboard with spring contacts that connect to the logic board. Speaker vibrations cause fretting of the contact surfaces, resulting in intermittent audio dropouts. Cleaning the contacts with a pencil eraser fixes this.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIsi |title=Macintosh IIsi |publisher=Wikipedia |access-date=2026-02-09}}</ref>


== Storage ==
== Storage ==
Line 117: Line 117:
=== Expansion Slot ===
=== Expansion Slot ===


The IIsi has a single '''Processor Direct Slot (PDS)''' compatible with [[Macintosh SE/30]] expansion cards (though running at 20 MHz instead of 16 MHz, some SE/30 cards may not work).<ref>{{cite web |url=https://lowendmac.com/1990/mac-iisi/ |title=Mac IIsi |publisher=Low End Mac |access-date=2026-02-09}}</ref>
The IIsi has a single '''Processor Direct Slot (PDS)''' compatible with [[Macintosh SE/30]] expansion cards. The slot runs at 20 MHz instead of 16 MHz, so some SE/30 cards may not work.<ref>{{cite web |url=https://lowendmac.com/1990/mac-iisi/ |title=Mac IIsi |publisher=Low End Mac |access-date=2026-02-09}}</ref>


An optional '''Apple IIsi NuBus Adapter''' card can convert the PDS slot to accept standard 7-inch NuBus cards. This adapter also includes a socket for the optional 68882 FPU. With a slim hard drive, 12-inch NuBus cards may also fit.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_ii/specs/mac_iisi.html |title=Macintosh IIsi Specs |publisher=EveryMac.com |access-date=2026-02-09}}</ref>
The '''Apple IIsi NuBus Adapter''' converts the PDS slot to accept standard 7-inch NuBus cards. This adapter also includes a socket for the optional 68882 FPU. With a slim hard drive, 12-inch NuBus cards may also fit.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_ii/specs/mac_iisi.html |title=Macintosh IIsi Specs |publisher=EveryMac.com |access-date=2026-02-09}}</ref>


== Power ==
== Power ==
Line 134: Line 134:
== Case Design ==
== Case Design ==


The IIsi uses a unique compact desktop case that was not used for any other Macintosh model. The case was designed for easy assembly and manufacturing, using clips and latches rather than screws, such that no tools are required for disassembly.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIsi |title=Macintosh IIsi |publisher=Wikipedia |access-date=2026-02-09}}</ref>
The IIsi uses a unique compact desktop case not shared with any other Macintosh. The case uses clips and latches rather than screws, requiring no tools for disassembly.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIsi |title=Macintosh IIsi |publisher=Wikipedia |access-date=2026-02-09}}</ref>


* '''Dimensions''': 4.0" H × 12.4" W × 14.9" D (10.2 × 31.5 × 37.8 cm)
* '''Dimensions''': 4.0" H × 12.4" W × 14.9" D (10.2 × 31.5 × 37.8 cm)
Line 141: Line 141:
== General Maintenance ==
== General Maintenance ==


Proper maintenance is essential to extending the lifespan and ensuring the reliable operation of your Macintosh IIsi. Common maintenance concerns include capacitor leakage, PRAM battery failure, and speaker contact corrosion.
Common maintenance concerns include capacitor leakage, PRAM battery failure, and speaker contact corrosion.


For detailed cleaning, battery maintenance, board inspection, and power supply procedures, refer to the [[Macintosh IIsi General Maintenance]] page.
For cleaning, battery maintenance, board inspection, and power supply procedures, see the [[Macintosh IIsi General Maintenance]] page.


== PCB Schematics & Service Manual ==
== PCB Schematics & Service Manual ==


The Macintosh IIsi consists of a logic board, power supply, and speaker daughterboard. Apple Service Source documentation provides detailed troubleshooting and repair information.
The Macintosh IIsi has a logic board, power supply, and speaker daughterboard. Apple Service Source documentation provides troubleshooting and repair information.


=== Apple Service Manual ===
=== Apple Service Manual ===
<pdf width="800" height="500">File:macintosh_iisi.pdf</pdf>
<pdf width="800" height="500">File:macintosh_iisi.pdf</pdf>


The complete Apple Service Source manual is available at [[Macintosh IIsi Service Source]]. Additional Apple Service Manuals can be found in the [[:Category:Apple Service Source|Apple Service Source]] category.
The complete Apple Service Source manual is at [[Macintosh IIsi Service Source]]. Additional manuals are in the [[:Category:Apple Service Source|Apple Service Source]] category.


== Capacitor Replacement Guide ==
== Capacitor Replacement Guide ==


The Macintosh IIsi logic board and power supply contain surface-mount electrolytic capacitors that are prone to leakage after 30+ years of age. Leaking capacitors can cause corrosion damage to PCB traces and intermittent operation.
The Macintosh IIsi logic board and power supply contain surface-mount electrolytic capacitors prone to leakage after 30+ years. Leaking capacitors corrode PCB traces and cause intermittent operation.


'''Logic Board Capacitors:'''
'''Logic Board Capacitors:'''
Line 162: Line 162:
* 11 × 47 µF 16V (surface-mount tantalum)
* 11 × 47 µF 16V (surface-mount tantalum)


Detailed capacitor replacement specifications and procedures can be found on the [[Macintosh IIsi Capacitor Replacement Guide]] page.<ref>{{cite web |url=https://68kmla.org/bb/threads/caps-macintosh-iisi.26708/ |title=Caps! -- Macintosh IIsi |publisher=68kMLA |access-date=2026-02-09}}</ref>
For capacitor specifications and procedures, see the [[Macintosh IIsi Capacitor Replacement Guide]].<ref>{{cite web |url=https://68kmla.org/bb/threads/caps-macintosh-iisi.26708/ |title=Caps! -- Macintosh IIsi |publisher=68kMLA |access-date=2026-02-09}}</ref>


== Troubleshooting ==
== Troubleshooting ==


Common issues with the Macintosh IIsi include startup failures, video problems, audio dropouts, and SCSI device issues. Many problems are related to capacitor failure or PRAM battery leakage.
Common issues include startup failures, video problems, audio dropouts, and SCSI device issues. Many problems are caused by capacitor failure or PRAM battery leakage.


A comprehensive troubleshooting guide addressing no power, video issues, Sad Mac errors, sound problems, and SCSI drive failures is available on the [[Macintosh IIsi Troubleshooting]] page.
For diagnostics on power, video, Sad Mac errors, sound, and SCSI failures, see the [[Macintosh IIsi Troubleshooting]] page.


== Technical Specifications ==
== Technical Specifications ==

Revision as of 12:12, 9 February 2026

Macintosh IIsi
Macintosh IIsi
Specifications
ManufacturerApple Computer, Inc.
TypeDesktop Personal Computer
ReleasedOctober 15, 1990
DiscontinuedMarch 15, 1993
Intro priceUS$2,999 – $3,770
CPUMotorola 68030 @ 20 MHz
Memory1 MB RAM soldered (expandable to 17 MB)
Storage40 MB, 80 MB, or 160 MB SCSI hard drive
DisplayIntegrated video (640×480 @ 8-bit color)
Sound8-bit stereo output, 8-bit mono input
Dimensions4.0" H × 12.4" W × 14.9" D (10.2 × 31.5 × 37.8 cm)
Weight10 lbs (4.5 kg)
OS / FirmwareSystem 6.0.7 – Mac OS 7.6.1
PredecessorMacintosh IIci
SuccessorMacintosh Centris 610
CodenameErickson, Raffica, Ray Ban, Spin, Oceanic
Model no.M0360

The Macintosh IIsi is a desktop personal computer designed, manufactured, and sold by Apple Computer, Inc. from October 1990 to March 1993.[1] Introduced as a lower-cost alternative to the Macintosh IIci, the IIsi was Apple's entry-level professional Macintosh, with more expandability than the Macintosh LC which launched the same day.[2]

The IIsi was the first Macintosh with built-in audio recording, featuring an integrated microphone input.[3] The compact desktop case was unique to the IIsi and not used for any other Macintosh model.

Architecture and Processor

The Macintosh IIsi uses a Motorola MC68030 microprocessor running at 20 MHz.[4]

  • 32-bit internal registers with 32-bit data path
  • 24-bit or 32-bit addressing modes
  • 0.5 KB Level 1 cache (on-chip)
  • No Level 2 cache

The system bus runs at 20 MHz. Apple underclocked the IIsi from 25 MHz to 20 MHz to avoid cannibalizing sales of the more expensive IIci. Many users modified ("chipped") their IIsi to run at 25 MHz or 28 MHz.[5]

Floating Point Unit

The Motorola 68882 FPU is optional and not included on the logic board. The FPU installs via the Apple NuBus Adapter card, which plugs into the Processor Direct Slot and converts it to a NuBus slot while providing the FPU socket.[6]

Memory

RAM Configuration

  • Soldered RAM: 1 MB on logic board
  • SIMM Slots: 4 × 30-pin SIMM slots
  • SIMM Speed: 100 ns minimum
  • Maximum RAM: 17 MB (Apple official), 65 MB (with unofficial 16 MB SIMMs)
  • SIMM Installation: Must be installed in matched groups of four identical SIMMs
  • Supported SIMM Sizes: 256 KB, 512 KB, 1 MB, 2 MB, 4 MB (8 MB and 16 MB SIMMs work but are not officially supported)

The IIsi's 1 MB of soldered RAM cannot be removed or disabled. When calculating total RAM, add this 1 MB to the SIMM capacity.[7]

ROM

  • ROM Size: 512 KB
  • ROM Type: Usually soldered to the logic board
  • ROM SIMM Slot: Present on some units; may contain a ROM SIMM instead of soldered ROMs
  • ROM ID: $067C

Some IIsi units shipped with ROMs on a removable SIMM rather than soldered chips. The IIsi ROM is reportedly compatible with the Macintosh SE/30 and may provide 32-bit clean operation when installed.[8]

Video

The Macintosh IIsi uses integrated video that shares main system RAM, reducing available RAM and impacting performance.[9]

Video Specifications

  • Video Output: DB-15 connector
  • Video RAM: 64 KB – 320 KB (shared from system RAM, depending on resolution)
  • Maximum Resolution: 640 × 480 pixels
  • Color Depth: 8-bit (256 colors) at 640 × 480
  • Portrait Monitor Support: 640 × 870 at 4-bit (16 grays)

Video uses the slow 1 MB of soldered RAM first, making video performance slower than dedicated VRAM systems. Setting the disk cache to 768 KB or larger forces video operations to use the faster SIMM RAM instead.[10]

Audio

The Macintosh IIsi was the first Macintosh with built-in audio input.[11]

  • Audio Output: 8-bit stereo, 22 kHz
  • Audio Input: 8-bit mono, omnidirectional microphone input
  • Output Jack: 3.5 mm stereo headphone jack
  • Input Jack: 3.5 mm microphone input
  • Internal Speaker: Mono speaker on daughterboard

The IIsi develops sound issues over time due to its modular construction. The internal speaker mounts on a daughterboard with spring contacts that connect to the logic board. Speaker vibrations cause fretting of the contact surfaces, resulting in intermittent audio dropouts. Cleaning the contacts with a pencil eraser fixes this.[12]

Storage

Hard Drive

  • Interface: SCSI (DB-25 external connector)
  • Standard Capacities: 40 MB, 80 MB, or 160 MB
  • Internal Bay: One 3.5" SCSI hard drive bay

Floppy Drive

  • Drive Type: Apple SuperDrive (1.44 MB)
  • Floppy Capacity: 1.44 MB (HD) and 800 KB (DD)
  • Injection Type: Auto-inject
  • External Connector: DB-19 floppy port

Input/Output and Expansion

Ports

  • ADB Ports: 1 (Apple Desktop Bus for keyboard and mouse)
  • Serial Ports: 2 × Mini DIN-8 RS-422 (Printer and Modem)
  • SCSI Port: DB-25 connector
  • Floppy Port: DB-19 connector
  • Video Port: DB-15 connector
  • Audio Output: 3.5 mm stereo jack
  • Audio Input: 3.5 mm microphone jack

Expansion Slot

The IIsi has a single Processor Direct Slot (PDS) compatible with Macintosh SE/30 expansion cards. The slot runs at 20 MHz instead of 16 MHz, so some SE/30 cards may not work.[13]

The Apple IIsi NuBus Adapter converts the PDS slot to accept standard 7-inch NuBus cards. This adapter also includes a socket for the optional 68882 FPU. With a slim hard drive, 12-inch NuBus cards may also fit.[14]

Power

  • Power Supply: 160W internal
  • Input Voltage: 100V – 240V AC
  • Frequency: 50 – 60 Hz
  • Maximum Wattage: 160W
  • BTU per Hour: 547.2
  • PRAM Battery: 3.6V lithium half-AA
  • Soft Power: Yes (power controlled via ADB keyboard)
  • Pass-Through: Yes (power outlet on back for monitor)

Case Design

The IIsi uses a unique compact desktop case not shared with any other Macintosh. The case uses clips and latches rather than screws, requiring no tools for disassembly.[15]

  • Dimensions: 4.0" H × 12.4" W × 14.9" D (10.2 × 31.5 × 37.8 cm)
  • Weight: 10 lbs (4.5 kg)

General Maintenance

Common maintenance concerns include capacitor leakage, PRAM battery failure, and speaker contact corrosion.

For cleaning, battery maintenance, board inspection, and power supply procedures, see the Macintosh IIsi General Maintenance page.

PCB Schematics & Service Manual

The Macintosh IIsi has a logic board, power supply, and speaker daughterboard. Apple Service Source documentation provides troubleshooting and repair information.

Apple Service Manual

The complete Apple Service Source manual is at Macintosh IIsi Service Source. Additional manuals are in the Apple Service Source category.

Capacitor Replacement Guide

The Macintosh IIsi logic board and power supply contain surface-mount electrolytic capacitors prone to leakage after 30+ years. Leaking capacitors corrode PCB traces and cause intermittent operation.

Logic Board Capacitors:

  • 2 × 220 µF 16V (axial electrolytic)
  • 11 × 47 µF 16V (surface-mount tantalum)

For capacitor specifications and procedures, see the Macintosh IIsi Capacitor Replacement Guide.[16]

Troubleshooting

Common issues include startup failures, video problems, audio dropouts, and SCSI device issues. Many problems are caused by capacitor failure or PRAM battery leakage.

For diagnostics on power, video, Sad Mac errors, sound, and SCSI failures, see the Macintosh IIsi Troubleshooting page.

Technical Specifications

System Overview

Sub-system Specification (Macintosh IIsi, October 1990)
CPU Motorola 68030 @ 20 MHz
FPU Optional Motorola 68882 (via NuBus adapter)
Bus Width 32-bit data • 24-bit or 32-bit addressing
ROM 512 KB
RAM 1 MB soldered + 4 × 30-pin SIMM slots (17 MB max official)
L1 Cache 0.5 KB (on-chip)
L2 Cache None
Video Integrated, 640 × 480 @ 8-bit (shares system RAM)
Sound 8-bit stereo output • 8-bit mono input
Storage 40/80/160 MB SCSI HDD • 1.44 MB SuperDrive
Expansion 1 × SE/30 PDS (convertible to NuBus with adapter)
Ports ADB • 2 × Serial • SCSI • Floppy • Video • Audio I/O

Model Configurations

Macintosh IIsi Model Numbers and Configurations
Order Number RAM Hard Drive Price (1990)
M0363LL/A 2 MB 40 MB US$2,999
M0364LL/A 5 MB 80 MB US$3,769
M0364LL/B 5 MB 80 MB —
M0491LL/B 3 MB 40 MB —
M0954LL/A 5 MB 160 MB —

Identification

Identifier Value
Apple Model Number M0360
Gestalt ID 18
ROM ID $067C

See Also

References

  1. ↑ Macintosh IIsi: Technical Specifications, Apple Inc.—link(accessed 2026-02-09)
  2. ↑ Macintosh IIsi Specs, EveryMac.com—link(accessed 2026-02-09)
  3. ↑ Mac IIsi, Low End Mac—link(accessed 2026-02-09)
  4. ↑ Macintosh IIsi, Wikipedia—link(accessed 2026-02-09)
  5. ↑ Mac IIsi, Low End Mac—link(accessed 2026-02-09)
  6. ↑ Macintosh IIsi Specs, EveryMac.com—link(accessed 2026-02-09)
  7. ↑ Macintosh IIsi: Technical Specifications, Apple Inc.—link(accessed 2026-02-09)
  8. ↑ Mac IIsi, Low End Mac—link(accessed 2026-02-09)
  9. ↑ Macintosh IIsi, Wikipedia—link(accessed 2026-02-09)
  10. ↑ Macintosh IIsi, Wikipedia—link(accessed 2026-02-09)
  11. ↑ Mac IIsi, Low End Mac—link(accessed 2026-02-09)
  12. ↑ Macintosh IIsi, Wikipedia—link(accessed 2026-02-09)
  13. ↑ Mac IIsi, Low End Mac—link(accessed 2026-02-09)
  14. ↑ Macintosh IIsi Specs, EveryMac.com—link(accessed 2026-02-09)
  15. ↑ Macintosh IIsi, Wikipedia—link(accessed 2026-02-09)
  16. ↑ Caps! -- Macintosh IIsi, 68kMLA—link(accessed 2026-02-09)
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