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8 DMA Channels .
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∙ 14y ago
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How many DMA channels are in AT class?
There are 8 DMA channels in an AT class computer.
How many DMA channels exist?
the DMA channels 0, 1, 2 and 3 with 8-bit and DMA channels 4, 5, 6 and 7 with only 16 bits.
How many DMA channels do AT-compatible PC's have?
8
How many DMA channels do AT compatible PC's have?
8
Are DMA channels part of a system resource?
Formally no, since 'resource' refers to something consumable, like RAM or CPU time. Rather, DMA channels are encountered to be a part of hardware infrastructure.
What software is used to examine DMA channels in PC?
device manager
What software is used to examine DMA channels in a PC?
device manager
Is it possible to use a dma controller if the system does not supports the interrupts?
You'd have to use DMA with polling, and thats usually not supported
What dma channel is used to cascade into the lower 4 dma channels?
lol ur doing the same homework assignment for me as in MR Jahns CST1 computer class in Orange Park FL at OPHS :P the A+ Guide to Hardware is the book we are using That doesn't answer the question at all. You're no help The answer is 4.
Which direct memory access channel is used for the floppy controller?
From http://www.brainbell.com/tutors/A+/Hardware/Direct_Memory_Access_DMA.htm "DMA channels use the same rules as IRQs. Just as with the 8259 chip, DMA availability soon became a problem because an insufficient number of channels was available. A second DMA chip was added for 286-based computers. Just like the second IRQ chip, these two are cascaded, allowing a total of eight DMA channel assignments (usually referred to simply as DMA channels). The floppy disk drives on all computers use DMA channel 2."
What is busmastering?
bus mastering is a feature supported by many bus architectures that enables a device connected to the bus to initiate transactions. Also called "First-party DMA", to contrast it with Third-party DMA, the situation where the system DMA controller is actually doing the transfer.
Why are DMA channels not as popular as they once were with high-speed devices?
ATA is much faster.
