ISA was designed to connect peripheral cards to the motherboard and permits for bus mastering. The 16-bit version was an upgrade for the motherboard buses of the Intel 80286 CPU (and expanded interrupt and Free slots no download DMA facilities) used in the IBM AT, with improved assist for bus mastering. IBM designed the 8-bit version as a buffered interface to the motherboard buses of the Intel 8088 (16/eight bit) CPU in the IBM Pc and Pc/XT, augmented with prioritized interrupts and DMA channels.

The ISA bus was due to this fact synchronous with the CPU clock until sophisticated buffering methods have been applied by chipsets to interface ISA to much faster CPUs. An extra deviation between ISA and ATA is that whereas the ISA bus remained locked into a single normal clock price (for backward hardware compatibility), the ATA interface supplied many alternative speed modes, may select among them to match the utmost speed supported by the hooked up drives, and saved adding faster speeds with later versions of the ATA normal (as much as 133 MB/s for ATA-6, the latest.) In most types, ATA ran a lot sooner than ISA, supplied it was related directly to a local bus (e.g.

southbridge-built-in IDE interfaces) sooner than the ISA bus. Later buses resembling VESA Local Bus and PCI have been used instead, Free slots no download usually along with ISA free slots on the identical mainboard.

Computer manufacturers responded to MCA by creating the Extended Industry Standard Architecture (EISA) and the later VESA Local Bus (VLB). 1987, IBM changed the AT bus with its proprietary Micro Channel Architecture (MCA). The 16-bit ISA bus was additionally used with 32-bit processors for a number of years.

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