Why is the literal in the op?code sign?extended before use (in most computer architectures)?
What will be an ideal response?
Literals in instructions are invariably shorter than the register size of the computer; for example, a 32?bit
processor might have a 16?bit literal and 32?bit registers. When the literal is loaded into the low?order bits of a
register, the upper order bits must either be cleared, left unchanged, or used to extend the loaded value to the
full length of the register (i.e., sign extension). Since many computer instructions operate with signed values or
with address offsets, it makes sense to sign?extend an operand when it is loaded. Some processors like the 68K
have separate address (pointer) and general?purpose data register. Values in address registers are always signextended, whereas those in data registers are not sign?extended.
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Discover ambiguities or omissions in the following statement of requirements for part of a ticket-issuing system:
An automated ticket machine sells rail tickets. Users select their destination and input a credit card and a personal identification number. The rail ticket is issued and their credit card account charged. When the user presses the start button, a menu display of potential destinations is activated, along with a message to the user to select a destination and the type of ticket required. Once a destination has been selected, the ticket price is displayed and customers are asked to input their credit card. Its validity is checked and the user is then asked to input their personal identifier (PIN). When the credit transaction has been validated, the ticket is issued.
What happens when you put your computer into sleep mode?
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In a(n) ____________________ packet-switched network, all packets that belong to a logical connection can follow the same path through the network.
Fill in the blank(s) with the appropriate word(s).
What was the early disadvantage of USB??
What will be an ideal response?