The 32-bit Micro Channel Shiell, Jon

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Shiell, Jon
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Microcomputers -- Design and construction; Computer architecture -- Innovations; Bus conductors (Electricity) -- Innovations
The direction of IBM's PS-2 line is towards 32-bit processing, 32-bit addressing, and 32-bit data transfers. The IBM Model 80's Micro Channel Architecture (MCA) demonstrates the latter. The Model 80's MCA bus includes four 16-bit slots and three 32-bit slots; an address-bus translator that enables 16-bit devices to take with the 32-bit channel, and a matched-memory cycle. The matched memory cycle provides the most efficient data transfer between the 80386 CPU and the Micro Channel; - a basic-transfer cycle is the default. The 32-bit MCA features also include all those of the 16-bit Micro Channel plus 32-bit addressing for the 32-bit slots. However, the Model 80 only supports 24-bit addresses on the DMA channels. The system can also support up to two additional processor boards and their I-O support and up to 18Mbytes RAM with 8Mbyte memory boards in two slots.
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