모리스마노 컴퓨터구조 11장 연습문제 해답 (컴퓨터 공학과 꿀팁!!)
11-3.
Character printer; Line printer; Laser printer; Digital ploller; Graphic display;
voice output; Digital to analog converter; Instrument indicator.
11-5.
See text discussion in see, 11-2
11-6.
(a) status command-checks status of flag bit.
(b) control command-moves magnetie head in disk.
(c) status command-checks if device power is on.
(d) control command-moves paper position.
(e) data input command-reads value of a register.
11-10.
1. output flag to indicate when transmiter register is empty.
2. input flag to indicate when receiver register is full.
3. enable interrupt if any flag is set.
4. parity error; (5) framing error; (6) overrun error.
11-11.
10 bits : start bit + 7 ASCII + parity + stop bit.
11-14.
Intial F = 0011 output <- R4
After delete=1 F=0010
After delete=0 F=0001 R4 <- R3
After insert=1 F=1001 R1 <- input
11-16.
Flag=0 if data register full (after CPU writes data)
Flag=1 if data register empty (after the transfer to device)
When flag goes to 0, enable "Data ready" and place data on I/O bus. when "Acknowledge" is enabled, set the flag to 1 and disable "ready" handshake line.
11-19
If an interrupt is recogniged in the middle of an instiction execution, it is necessary to save all the information from control registers in addition to processor registers. The state of the CPU to be saved is more complex.
11-23.
Same as Fig 11-14. Needs 8 AND gates and an 8 x 3 decoder
11-26.
set the mask bit below to the interrupt source so it can interrupt again.
At the beginning of the service rectine, check the value of the return address in the stack. If it is an address nothing the source service program, then the same source has interrupted again while being serviced.
11-27.
The service routine checks the flags in seeve to determine which one is set, Thet first flag that is checked has the highest priority level, The priority level of the other sources corresponds to the order in which the flags are checked.
11-32.
There are 26 letters and IO numerals.
26 x 26 +26 x 10 = 936 possible addresses.
11-35.
32 bits between two flags; 48 bits including the falgs.
11-36.
Information to be sent(1023) : 01111111111
After gero in sertion information transmitted : 01110111110
Information received after os deletion : 01111111111
모리스마노 컴퓨터구조 11장 연습문제 해답 (컴퓨터 공학과 꿀팁!!)
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