I'm here to help with your questions! Let's break down the information provided in the question:
1. **Logical operations by the ALU:**
The Arithmetic Logic Unit (ALU) can perform logical operations. Two common logical operations are:
- **AND operation:** This operation results in true (1) only if both input values are true. For example, if A=1 and B=1, then A AND B = 1.
- **OR operation:** This operation results in true (1) if at least one of the input values is true. For example, if A=1 and B=0, then A OR B = 1.
2. **Features of secondary storage devices:**
(i) **Mass storage:** Secondary storage devices have large storage capacities compared to primary memory.
(ii) **Content cannot be accessed directly:** Unlike primary memory, data on secondary storage devices needs to be transferred to primary memory for processing.
3. **Toggle key:**
(a) **Toggle key:** A toggle key on a computer keyboard is a key that can switch between two input modes or states.
(b) **Examples of toggle keys:** Examples of toggle keys include Caps Lock, Num Lock, and Scroll Lock keys.
4. **Printers for specific tasks:**
- (a) **Printing receipts and invoices:** Thermal printers are commonly used for printing receipts and invoices due to their fast printing speed and cost-effectiveness.
Feel free to ask if you need further clarification or have more questions!
