2. With the 8251A Serial port asynchronous communication, spontaneous self-income, the baud rate 1200bps. Using query mode to send, receive interrupt. From the keyboard input string (character count ≤ 255) into send buffer and displays, start sending keys defined by the experimenters themselves, since the close results showed on the screen. Press Esc to return DOS. (Defined as the Enter key to start the send button)

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