| The Macintosh IIsi computer shares many, but not all of the features of the more powerful [[Macintosh IIci]] computer. Like that of 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]] (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. | | The Macintosh IIsi computer shares many, but not all of the features of the more powerful [[Macintosh IIci]] computer. Like that of 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]] (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. |
− | On-board video support for 12-inch B & W, 12-inch RGB, and 13-inch RGB monitors and 15-inch B & W portrait monitor. | + | 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. |