All Macs
Macintosh IIsi
Mac II
1990-1999

Macintosh IIsi

Affordable modular Mac with built-in audio and video. Bridged the gap between the LC and IIci.

Also launched October 15, 1990 as part of Apple's ambitious triple product release alongside the LC and Classic, the Macintosh IIsi was designed to bridge the gap between the affordable but limited LC and the expensive, fully expandable IIci, giving buyers a genuinely capable modular Mac at a considerably friendlier price point. It used a 68030 processor running at 20MHz, slower than the IIci's 25MHz but with the same full 32-bit-clean architecture and integrated memory management unit, meaning it offered real performance headroom and future-proofing that the LC's 68020 simply couldn't match. Its compact, low-profile case shared strong visual DNA with the IIci, and while it lacked the IIci's three built-in NuBus slots in its base configuration, an internal expansion adapter card could be installed to add a single NuBus slot for those who needed at least some hardware expansion, giving cautious buyers a modest but meaningful upgrade path. Notably, the IIsi included a built-in microphone and support for Apple's early sound and speech recognition software, a novel touch for the era that hinted at where Apple hoped consumer computing might be headed. It shipped with built-in color video support similar to the IIci, letting buyers avoid the expense of a separate NuBus video card while still enjoying full color graphics capability. Reviewers saw the IIsi as a smart, well-considered middle path, praising its strong performance-to-price ratio and its position as an accessible entry into genuine 68030, 32-bit-clean Mac computing for small businesses and professionals who found the IIci too expensive but wanted more expandability and speed than the LC could offer. Some critics noted the awkwardness of its limited single-slot expansion compared to the IIci's three slots, and its overall performance, while solid, never quite matched its pricier sibling. Still, it found a substantial following among small business buyers, creative professionals on a budget, and anyone who wanted the reliability and expandability of the Mac II architecture without the IIci's premium price tag. Its release as part of Apple's coordinated October 1990 lineup, spanning the LC, Classic, and IIsi, represented one of the most significant single-day expansions of the Macintosh product line in the company's history, effectively creating a complete good-better-best structure across price points that would define Apple's strategy for years to come. The IIsi is remembered as a sensible, well-executed value proposition that successfully democratized access to genuine 68030 performance for a broader swath of Mac buyers.

Launch price: $3,769

Mac History Timeline

1984-1989
1990-1999
2000-2005
2006-2012
2013-2019
2020-present
1984199019952000200520102015202020252026
Macintosh IIsi1990โ€“1993

Full Specifications

Availability

IntroducedOctober 15, 1990
DiscontinuedMarch 15, 1993
Original OSSystem 6.0.7

Processor

CPUMotorola 68030
Clock Speed20 MHz
FPUMotorola 68882 (optional)
System Bus20 MHz

Memory

Standard RAM1 MB
Maximum RAM65 MB
RAM Type30-pin SIMM
RAM Slots4

Storage

Storage40โ€“80 MB HDD

Display

DisplayExternal

Graphics

GPUBuilt-in
VRAM256 KB

Expansion

Expansion Slots1 NuBus/PDS (via adapter)

Connectivity

PortsSCSI, Serial (ร—2), ADB (ร—2), floppy, audio

Physical

Weight11.8 lbs (5.4 kg)

Processor Deep Dive

๐Ÿ”ฒ

Motorola 68030

Motorola
Architecture: 68k CISC (full 32-bit)
Introduced: 1987
Process: 1000 nm (HCMOS)
Transistors: 273,000

Running at 20MHz in the IIsi, this 68030 implementation split the difference between the IIcx and IIci in raw clock speed while offering the same full 32-bit-clean architecture and integrated memory management unit found across the 68030 family. This made the IIsi considerably more future-proof than the LC's 68020, capable of properly supporting virtual memory and later System 7 features without compromise. Its balance of solid performance and lower cost than the IIci made it an attractive option for budget-conscious professionals. It reinforced the 68030 as Apple's core processor across a wide swath of its early-1990s desktop lineup.

Mac II progression ยท 6 of 6

Compatible Operating Systems

System 6.0.7

System 6.0.7

Launch OS

1990

Shipped with the IIsi, taking full advantage of its 32-bit-clean 68030.

System 7.0

System 7.0

Compatible

1991

Ran well and was a popular upgrade path for IIsi owners thanks to the clean 68030 architecture.

System 7.6.1

System 7.6.1

Max Supported

1997

The realistic ceiling for a well-equipped IIsi with maximum RAM installed.

Reviews & Reception

Generally well received as a smart value-oriented bridge between the LC and IIci, with some reservations about its limited expansion slot count.

The IIsi hits a sweet spot between the affordable LC and the pricier IIci, delivering genuine 32-bit-clean performance at a much friendlier price.

MacWorld
1990
4/5

A smart, well-balanced machine, though the single-slot expansion limitation compared to the IIci is a real compromise for growth-minded buyers.

MacUser
1990
4/5

Small businesses finally have an affordable path to real Mac II performance without the premium the IIci commands.

InfoWorld
1990
4/5

The built-in microphone and sound features hint at interesting future directions, though the core appeal remains solid, value-oriented 68030 performance.

BYTE
1991
4/5