Macintosh IIsi Home

The Macintosh IIsi was introduced in October of 1990. It has a case similar to the pizza-box LC, but it is taller and has room inside for a NuBus expansion card with a special adapter.

Macintosh IIsi Specifications

• Release Date: October 15, 1990
• Discontinuation Date: March 15, 1993
• Processor: Motorola 68030 @20MHz
• Bus Speed: 20MHz
• L1 Cache: 0.5k
• RAM: 2, 3 or 5MB. Upgradable to up to 65MB.
• RAM Type: 30-pin SIMM (4 Slots)
• VRAM: 64-320kb (Motherboard RAM is used for VRAM)
• HDD Size (Standard): 40, 80 or 160MB
• HDD Type: SCSI
• Expansion Slots: 1x PDS (Adapter card available to add a NuBus slot)
• PRAM Battery Type: 1/2-AA 3.6V Lithium
• Original Mac OS: System 6.0.7
• Maxiumum Mac OS: System 7.6.1

Macintosh IIsi Upgrades

The Macintosh IIsi has a decent amount of upgrade potential through installing expansion cards, processor upgrades, and more.

Processor Upgrades

Processor Upgrades were available to upgrade a IIsi to a 40MHz 68040 processor.

Overclocking

The IIsi can easily be overclocked to 25MHz to match IIci speeds via swapping out the 40MHz crystal oscillator with a 50MHz replacement.

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Page last updated (MM/DD/YYYY): 04/20/2024
Update Reason: added newnav

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