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The System Management Bus (SMBus or SMB) is a single-ended simple two-wire bus for the purpose of lightweight communication. Most commonly it is found in chipsets of computer motherboards for communication with the power source for ON/OFF instructions.
After first stating that the AT bus was sufficient for customers, [6] a group of companies led by Compaq (the Gang of Nine) developed a new bus instead. This new bus was named the Extended (or Enhanced) Industry Standard Architecture, or "EISA", while the older AT bus had already been renamed Industry Standard Architecture, or "ISA". [8]
The SystemPro from Compaq, released in November 1989, is a computer capable of running server-based computer operating systems and was arguably the first true PC based server [citation needed]. It supports Intel's 486 chip, a 32-bit bus, RAID disk and dual-processor support well before its main rivals.
[20] [21] Compaq halted production until the fall of that year when a new batch of controllers was produced; machines with the fault-free controller have an orange sticker on the door of the PC Card slot. [21] This PC Card snafu was a major factor in Compaq's decision to cancel their Concerto tablet in August 1994. [22]
As an example, assume the case of Wake-on-LAN. Traditionally, the OS controls Wake-on-LAN and must call third-party device drivers to enable support on a network card. With the HECI bus, the host is able to assert its request line (REQ#), the ME will assert its grant line (GNT#), and the host can send its message using its serial transmit signal.
The LPC bridge provides a data and control path to the super I/O (the normal attachment for the PS/2 keyboard and mouse, parallel port, serial port, IR port, and floppy controller). SMBus controller. DMA controller. The 8237 DMA controller allows ISA or LPC devices direct access to main memory without needing help from the CPU. PIC and I/O APIC.
The AT bus was a mostly backward-compatible extension of the PC bus—the AT bus connector was a superset of the PC bus connector. In 1988, the 32-bit EISA standard was proposed by the "Gang of Nine" group of PC-compatible manufacturers that included Compaq. Compaq created the term Industry Standard Architecture (ISA) to replace PC compatible. [4]
Compaq's technical leadership and the rivalry with IBM was emphasized when the SystemPro server was launched in late 1989 – this was a true server product with standard support for a second CPU and RAID, but also the first product to feature the EISA bus, designed in reaction to IBM's MCA (Micro Channel Architecture) which was incompatible ...