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Macintosh IIsi

178 bytes added, 29 June
32-bit internal data bus, 256-byte instruction and data caches, Burst-mode RAM access, Built-in memory management unit (MMU).
The Macintosh IIsi computer shares many, but not all of the features of the more powerful [[Macintosh IIci]] computer. Like that of theMacintosh the Macintosh IIci, the architecture of the Macintosh IIsi is based on the Memory Decode Unit (MDU) and RAM-Based Video (RBV) chips. Key features are the computer’s 20 MHz clock speed, on-board video,sound input capability, flexible expansion ([[NuBus]] or processor-direct slot), custom micro controller that controls the [[Apple Desktop Bus™ Bus]] (ADB), real-time clock, soft power control, power-on reset functions, and custom chip that combines [[SCSI]] (Small Computer Systems Interface) and SCC (Serial Communications Controller) functions. Codenames: Oceanic, Ray Ban. Introduced in October 1990 and discontinued in March 1993. Originally shipped with system software 6.0.7.
On-board video support for 12-inch B & W, 12-inch RGB, and 13-inch RGB monitors and 15-inch B & W portrait monitor. 64K-320K of system DRAM used for video.

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