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Questions and Answers
What is the maximum number of bits that the data bus of a parallel port can handle?
What is the maximum number of bits that the data bus of a parallel port can handle?
- 16
- 24
- 32 (correct)
- 64
What is the main purpose of a parallel port?
What is the main purpose of a parallel port?
- To connect a mouse to a computer processor chip
- To connect a monitor to a computer processor chip
- To connect a printer to a computer processor chip (correct)
- To connect a keyboard to a computer processor chip
Which lines are included in the physical connector of a parallel port?
Which lines are included in the physical connector of a parallel port?
- Ground reference lines, +12V, and 24 pins
- Ground reference lines, +3V, and 24 pins
- Ground reference lines, +5V, and 24 pins (correct)
- Ground reference lines, -5V, and 24 pins
How does the printer indicate readiness to receive data?
How does the printer indicate readiness to receive data?
What does the PC do to tell the printer that data is ready?
What does the PC do to tell the printer that data is ready?
What does the printer do after acknowledging the data sent by the PC?
What does the printer do after acknowledging the data sent by the PC?
What is the base address for LPT1: using the parallel port?
What is the base address for LPT1: using the parallel port?
Which library provides port access support for C programs?
Which library provides port access support for C programs?
What is the main difference between full duplex mode and half duplex mode?
What is the main difference between full duplex mode and half duplex mode?
What is the strategy used in status polling assembly code?
What is the strategy used in status polling assembly code?
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Study Notes
- Parallel port has 5 status lines (Busy) and 4 control lines (Strobe#)
- Data bus can handle up to 32 bits
- Used to connect a printer to a computer processor chip
- Physical connector includes ground reference lines, +5V, and 24 pins
- Handshake process involves sending data byte to parallel data port
- Printer indicates readiness by setting Busy to 0
- PC sets up data bits on D0-D7 and tells printer data is ready by setting Strobe# to 0
- Printer acknowledges by setting Busy to 1 and takes data
- PC sets Strobe# to 1 to be ready for next cycle
- Diagram shows data flow between PC and printer
- The parallel port has three addresses, with LPT1: using 0x378 as the base address.
- The Tutor 'ps' command can be used to access the parallel port.
- The $pcinc/cpu.h library provides port access support for C programs.
- Two basic strategies for I/O driver code are status polling and interrupt driven.
- Full duplex mode allows for sending and receiving data simultaneously.
- The UART is initialized by the Tutor on COM1: and COM2:.
- In half duplex mode, modem signal handshake is required.
- In status polling, the processor loop is faster than byte transfer rate.
- Status polling assembly code involves turning on DTR and RTS, waiting for DSR, CTS, and DCD, and reading data ready.
- Polling loops can be implemented in C for receiving and transmitting data.
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