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=== Video Specifications === * '''Video Output''': DB-15 connector * '''Video RAM''': 64 KB โ 320 KB (shared from system RAM, depending on resolution) * '''Maximum Resolution''': 640 ร 480 pixels * '''Color Depth''': 8-bit (256 colors) at 640 ร 480 * '''Portrait Monitor Support''': 640 ร 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.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Macintosh_IIsi |title=Macintosh IIsi |publisher=Wikipedia |access-date=2026-02-09}}</ref>
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