power supplies pc
power supplies pc(Redirected from PC/AT)The IBM Personal Computer/AT (IBM 5170), more commonly known as the IBM AT and also sometimes called the PC AT or PC/AT, was IBM's second-generation PC, designed around the Intel 80286 microprocessor running at 6 MHz and released in 1984. Because the AT used various technologies that were rare at the time in personal computers, the name AT originally stood for Advanced Technology, and indeed, the Intel 80286 processor used in the AT supported Protected mode. Later, IBM released a version of the AT running at 8 MHz. AT features16-bit ISA bus - The AT motherboard had a 16-bit data bus and supported both 8-bit PC-style expansion cards as well as the new 16-bit AT expansion cards for the 8028615 IRQs and 7 DMA channels, expanded from 8 IRQs and 4 DMA channels for the PC. IRQ 8-15 are cascaded through IRQ 2, which leaves 15 active instead of 16. Power Supplies. Similarly, DMA channel 4 is reserved for cascading 0-3 leaving 7 channels active. 16 MiB maximum memory supported by the 24-bit address bus, compared to the PC's 640 kiBbattery backed Real-time clock on motherboard with 50 bytes CMOS memory available for power-off storage of BIOS parameters. (the basic PC had required either manual setting of its software clock using Time and Date commands, or the addition of an accessory expansion card with real-time clock, to avoid the default 01-01-80 file date)84-key AT keyboard layout - the "84th key" being <SysRq> i. e. Home poker supplies home medical supplies viking office supplies office furniture supplies plotter supplies diabetes medical supply lilo and stitch party supplies sony computer power supply hp laserjet supplies supply chain planning texas power of attorney remote power monitoring gas powered model airplanes cpu power supply power yacht charter computer power supply unit power block weights atx micro power supply thinkpad power customer service internet dating services high speed internet services call conference services online payroll services discount hosting services web prepaid cellular phone service dedicated hosting provider service wedding services web design and hosting services dialup service cable modem service limousine service in los angeles free web hosting services emergency answering service net phone service serviced apartment in london credit counselling services air ambulance services san diego limo services top internet service provider free single dating service review of web hosting services college loan services |