I/O Address Space at Cynthia Dennison blog

I/O Address Space. The address can be found by multiplying the interrupt number by 4, that being the offset at which the handler's address is. Special instructions to access devices. Address 0x3f8 (com1) exists both in i/o space and memory space and are two different things. There is a 64k address space for i/o addresses, although typically less than 1k is used. Each board that uses an i/o address contains a few bytes of memory (16, 32, etc.) set to a default. An address space is simply a range of allowable addresses. An i/o address is a unique number assigned to a particular i/o device, used for addressing that device.

CS 286 Computer Organization and Architecture ppt download
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Each board that uses an i/o address contains a few bytes of memory (16, 32, etc.) set to a default. An address space is simply a range of allowable addresses. Address 0x3f8 (com1) exists both in i/o space and memory space and are two different things. Special instructions to access devices. There is a 64k address space for i/o addresses, although typically less than 1k is used. The address can be found by multiplying the interrupt number by 4, that being the offset at which the handler's address is. An i/o address is a unique number assigned to a particular i/o device, used for addressing that device.

CS 286 Computer Organization and Architecture ppt download

I/O Address Space The address can be found by multiplying the interrupt number by 4, that being the offset at which the handler's address is. An address space is simply a range of allowable addresses. An i/o address is a unique number assigned to a particular i/o device, used for addressing that device. Address 0x3f8 (com1) exists both in i/o space and memory space and are two different things. Each board that uses an i/o address contains a few bytes of memory (16, 32, etc.) set to a default. There is a 64k address space for i/o addresses, although typically less than 1k is used. Special instructions to access devices. The address can be found by multiplying the interrupt number by 4, that being the offset at which the handler's address is.

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