May 2024
Intermediate to advanced
889 pages
30h 8m
English
book
The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
by Lyla B. Das
Content preview from The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
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13-10
THE
x86 MICROPROCESSORS
initialization. The busy flag indicates whether the IOP is busy or ready to perform a new
I/O operation. The CCW (channel command word) is specified by the CPU to indicate
the type of operation required from the IOP. The CCW in the 8089 does not have the
same meaning as the command word in an interfacing chip. The CCW here is more like
an I/O instruction that specifies an operation for the IOP, such as start operation, suspend
operation, resume operation and halt I/O program. The parameter block contains vari-
able data that the IOP program must use in carrying out its task. The task block contains
the actual program ...
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