Apple · Macintosh

Macintosh IIsi

Released October 1990

A compact 20 MHz Macintosh II desktop with built-in colour video, microphone input and one expansion slot.

Specifications

Processor: 68030 20 MHz (Macintosh IIsi)
CPU cores: 1
Memory: 1 MB
CPU: 20 MHz Motorola 68030 with integrated memory management and 0.5 KB L1 cache; 68882 floating-point coprocessor optional through an expansion adapter
GPU: Built-in 8-bit colour video supports 512 × 384 and 640 × 480 using 64–320 KB of system RAM
Memory type: 1 MB soldered to the logic board plus four 30-pin SIMM slots in one matched bank; 100 ns memory and 1–17 MB total supported by Apple; 512 KB ROM
Storage type: Internal 1.44 MB floppy drive with SCSI hard-drive options of 40 or 80 MB; Apple does not document the paired RAM and drive configurations on its support sheet
Expansion slots: One processor-direct slot can be used directly or with an optional NuBus adapter; no built-in NuBus slot or L2 cache

Ports: Headphone jack
Back ports: One Apple Desktop Bus port, DB-15 video, DB-19 external floppy, DB-25 SCSI, printer and modem serial ports, sound output and microphone input; no built-in Ethernet
External displays: Built-in video supports an Apple colour display at 640 × 480 with 8-bit colour; a compatible expansion graphics card can extend display options
Speakers: Internal speaker, stereo 8-bit sound output and mono audio input

Type: Compact
Weight: 4.5 kg
Width × depth × height: 315 × 378 × 102 mm
Operating system: macOS
Size and weight detail: Apple's 4 × 12.4 × 14.9 inch and 10 lb reference dimensions; metric fields are rounded conversions
Power supply: Maximum 160 W; 100–240 V AC, 50–60 Hz; 3.6 V lithium clock battery and keyboard soft power
In the box: Original System Software 6.0.7. Apple lists 15 October 1990 as the introduction date; no separate first-sale day was found

Processor	Memory	Storage
68030 20 MHz (Macintosh IIsi)	1 MB	–

Model	Type	Processor	Memory	Storage	Screen	Weight	Released
AppleMacintosh IIci	Compact	68030 25 MHz (Macintosh IIci)	1 MB	40 MB	–	6.2 kg	Sept 1989
AppleMacintosh IIx	Compact	68030 16 MHz (Macintosh IIx)	1 MB	40 MB	–	10.9 kg	Sept 1988
AppleMacintosh LC	Compact	68020 16 MHz (Macintosh LC)	2 MB	40 MB	–	4 kg	Oct 1990