Table of Contents
What channel is used for the standard floppy disk controller?
It is often also connected to a channel of the DMA controller. On the x86 PC the floppy controller uses IRQ 6, on other systems other interrupt schemes may be used. The floppy disk controller usually performs data transmission in direct memory access (DMA) mode.
What are channels in DMA controller?
DMA channels are used by high speed devices and they allow them to communicate directly with the main memory (RAM) on our system. DMA channels can be used by sound cards, hard disk drives, CD/DVD-ROM drives, tape drives, etc. DMA is managed by DMA controller chip (8237).
What is the DMA channel?
A DMA channel enables a device to transfer data without exposing the CPU to a work overload. Without the DMA channels, the CPU copies every piece of data using a peripheral bus from the I/O device.
How many DMA channels are there?
All eight channels are identical, and are capable of transferring data to or from memory, external I/O, or internal I/O. The priority between the channels can be either fixed or rotating, and the DMA use of the bus can be limited to guarantee interrupt latency or CPU throughput.
What is floppy cable?
A floppy cable is a ribbon cable found in PC’s that allow one or more floppy disk drives to connect to a computer. The floppy channel, FDD header, or floppy connection is where the floppy drive connects to the computer motherboard.
What type of cable is used by floppy drives?
Floppy Disk Drive Cable The cable uses a 34-pin IDC connector [requiring a 34-pin device header], and a 34-pin flat ribbon cable [IDC Definition]. The connector size differ between the two drive types, with the 5.25″ drives requiring a larger connector.
What is two channel DMA controller?
The Multi-Channel Direct Memory Access (MCDMA) Controller is designed to improve microprocessor system performance by allowing external devices to directly transfer information from the system memory. Memory-to- memory transfer capability is also supported.
How do DMA channels work?
DMA channels are used by high speed devices and they allow them to communicate directly with the main memory (RAM) on our system. When DMA channels are used, CPU is not involved in the communication. Communication without the CPU is a benefit since CPU is busy with all sorts of different processing tasks.
Where do you connect floppy cable?
Today, if any floppy drive is in the computer it would connects to “Drive A:” and the end cable connected to the motherboard. The floppy channel, FDD header, or floppy connection is where the floppy drive connects to the computer motherboard.
What is the f panel cable?
The front panel header is where the connectors of hard disk drive activity lights, case speaker, reset button, power on/off button, computer power on light, and key lock, are connected to make them function smoothly.