Unformatted text preview: two requests? 5. Suppose the ISA of a machine supports 16-bit wide instructions. The ISA includes two I/O instructions, IN and OUT with a 8-bit op-code and 8-bit immediate operand (constant operand). Given that each controller has one status register, one control register, one data-in register, and one data-out register, how many controllers can we address with this machine? Are there any hardware changes we can make to double the number of addressable controllers? 6. Textbook exercise 13.3...
View Full Document
- Spring '11
- Operating Systems, Central processing unit, Status register, Textbook exercise