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Apple Macintosh IIsi Specs

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Apple Macintosh IIsiThe Apple Macintosh IIsi features a 20 MHz 68030 processor, 2 MB or 5 MB of RAM, and a 40 MB, 80 MB, or 160 MB hard drive in a compact, easy-to-expand desktop case.

Basically, the Macintosh IIsi is a scaled-down version of the Macintosh IIci, in a smaller, sleeker case with fewer expansion options. However, the Macintosh IIsi was also the first Mac to support built-in audio recording capabilities, an option that the IIci lacks.

To purchase or upgrade a vintage Mac -- and newer Macs -- see site sponsor OHS.


  • Tech Specs
  • Ports

Click on the category for related details. The most commonly needed info is "open" by default, but all info is important.


October 15, 1990 March 15, 1993
Details: The "Introduction Date" refers to the date a model was introduced via press release. The "Discontinued Date" refers to the date a model either was replaced by a subsequent system or production otherwise ended.

Also see: All Macs introduced in 1990.
20 MHz 68030
Details: This model has a 32-bit processor and a 32-bit data path.
Third-Party* 68882 (Optional)**
Details: *A variety of third-party processor upgrades and accelerators were available.

**The optional 68882 FPU co-processor can be installed via the Apple NuBus adapter.
20 MHz N/A
Details: N/A
Macintosh ROM 512k
Details: N/A
0.5k N/A
Details: The Macintosh IIsi does not have a level 2 cache.
30-pin SIMM 100 ns
Details: N/A
2, 3, 5 MB* 65 MB
Details: *Configurations included 2 MB, 3 MB, and 5 MB of RAM standard.

Also see: Actual Max RAM of All G3 & Later Macs.
1 MB 4*
Details: *1 MB of RAM onboard. Four identical RAM SIMMs must be installed in a group.
Integrated* Integrated*
Details: *The Macintosh IIsi shares system memory for video function.
64k-320k* 64k-320k*
Details: *64k-320k of the system RAM is dedicated to video function depending on resolution used.
Single Display* 640x480*
Details: *Onboard video is capable of supporting a maximum resolution of 640x480. If the optional NuBus adapter card is installed, a second video card can be installed to support a second display. The NuBus adapter also provides a 68882 FPU.
Single Display* Variable*
Details: *The onboard video supports a single display. However, if the optional NuBus adapter card is installed, a NuBus video card can be installed to support a second display. The NuBus adapter also provides a 68882 FPU.
40, 80, 160 MB* SCSI
Details: *Offered with either a 40 MB, 80 MB, or 160 MB hard drive.
None 1.44 MB (Auto)
Details: N/A
None None
Details: N/A
PDS or NuBus* None
Details: *The optional Apple NuBus adapter card plugs into the PDS expansion slot and also provides an FPU.
Desktop Macintosh IIsi
Details: N/A
M0363LL/A* Macintosh IIsi
Details: *M0363LL/A refers to the configuration with 2 MB of RAM and a 40 MB hard drive. M0364LL/A and M0364LL/B refer to the configuration with 5 MB of RAM and an 80 MB hard drive. Other configurations include M0491LL/B, which includes 3 MB of RAM and a 40 MB hard drive and M0954LL/A, which includes 5 MB of RAM and a 160 MB hard drive.
M0360 18
Details: Please note that these identifiers commonly refer to multiple models.

Also see: All Macs with the M0360 Model Number and 18 Gestalt ID.

For more about identifiers and how to locate them on modern Macs, please refer to EveryMac.com's Mac Identification section.
3.6V Lithium N/A
Details: N/A
6.0.7 6.0.7-7.5.1, 7.5.3-7.6.1
Details: Earlier and later versions of the Macintosh System/Finder and Mac OS are not supported.

For systems capable of running older versions of the Mac OS -- as well as modern ones -- please see site sponsor OHS. OHS specializes in heavily upgraded Macs capable of running both Mac OS X and Mac OS 9 applications.
4.0 x 12.4 x 14.9 10.0 lbs (4.5 kg)
Details: In inches - height by width by depth, (10.16 cm, 31.5 cm, 37.8 cm).
US$3770, US$4570 N/A*
Details: *As a collector's item, this model may still retain value.

Photo Credit: MacUser Magazine (Radius Advertisement).


Click on a category for additional details. The most commonly needed info is "open" by default, but all info is important. The icons correspond with the icons for each port on the computer.


1 (DB-15) 1 (DB-19)
Details: One onboard DB-15 video port.
1 1 (DB-25)
Details: N/A
2 None
Details: Serial ports are marked by printer and modem icons.
None None
Details: N/A
None None
Details: N/A
None 1 (Mono)
Details: N/A
1 (Stereo) None
Details: N/A
1 None
Details: N/A
1 N/A
Details: 100V-240V AC, 50-60 Hz Frequency, 160 Max Watts.

Icon Credit: Apple Computer, Inc.

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