5.6 DMA5.5 5.4 5.3 I/O5.2 5.1

5.1 1. CPU I/O 2. DMA CPU I/O 3. 4. I/O DMA

I/O

CPUI/OI/O I/O I/O I/OI/O

1. I/O CPU IBM/370 64 2. I/O I/O

I/O 1. I/O (1) (2) I/O 2. 3. (1) (2)

1234I/O

I/OI/OI/OI/O

DMA

I/OCPUI/OI/O

I/O1. 2. 3. (1) (2) DMA

4. (1) (2) (3)

5. I/O (1) (2)

I/O1. CPU I/O

(programed direct control)

I/O

/CPUCPU

CPU

CPUI/OCPUCPUCPUI/O2. CPUI/O

2. I/O CPU CPU CPU I/O

CPU I/O CPU I/O

CPUCPU

CPU

CPU

CPUI/O()

I/OTrap

11CPUCPU00001000

CPU

PC PC

/CPUCPU

84=

00001000

00100000

00

02

00

10

8

00000H

00001H

00020H

10200H

3. DMA I/O CPU I/O

DMADMAI/OI/ODMADMADMA

DMA

DMADMA

DMADMACPU

DMACPUCPU

DMACPUDMACPUDMADMADMACPUDMACPU

CPUDMACPUmulDMACPUDMADMADMACPU2~5

DMACPUDMADMACPUDMACPU

I/OI/OI/OCPUDMADMADMADMA

DMA,DMA,CPU.,DMA.CPU,DMACPU,,.

DMACPUCPUCPUDMACPUCPUDMACPU: 3.DMACPU,DMA,,CPU,DMA

DMA DMA 1DMA DMA 2DMAI/O 292 292 3CPU DMA

DMA

DMADMA:,.DMACPUI/O,,DMA,,.DMAI/O,DBR,(I/O,,).

DMACPUDMA,,DBR.DMAMAR,,.WC1;MAR1,.WC0,,,; WC0,,,CPU.,MAR.,.

DMADMADBR.DBR,,DBR.WC1,MAR1,.WC0,0,,,DMA. WC0,,CPUCPU,DMA;,;,.

DMA,,,,DMA,:DMA,,. DMA,.DMACPU,CPU,CPU,CPU.,,I/O.

CPU DMA

DMA(1) DMA DMA (2) DMA CPU CPU CPU CPU

IO CPU IO IO IO CPU CPU

DMA DMA

/I/O

DMAI/O/DMA

5.2 I/O 1. 2.

1. 2. 3. ASCII

(mouse)(trackboll)(joystick )1.

XYCPUXY

2.

3. (stick)(5mm)(distortion gauge)

()()()()

()5

3232326430ms15msXY

1. 2.

1 (cathode ray tubeCRT)(liquid crystal display,LCD)CRT

(monitor)

1. (CRT)CRTCRTCRT()CRT

(CRT)

(1) (2) (3) CRTCRTCRTCRT

2. (FPD)1/4(LCD)(PDP)(FED)(ELD)LCD

(1) (LCD)LSI(TFT-LCD)

LCD PCPDA (TFT-LCD)PC

(2) (plasma display panelPDP)PDP256

PDP(1) (70)(2) 2561 670(2563)CRT(3) 160(4) (3)(5)

1. (graphics)(image)

()

2. (resolution)(gray level)CRT

()IBM

CGAEGAVGASVGAXGASXGA640200640350640480800600102476812801024

3. CRT()(refresh)3050(frame)

(VRAM)VRAMVRAMVRAMDRAM

n() m()

1.

2. (1) (2) (3) ()(4) (5) ()(6)

3. () ()

4. A4A3(pages per minutePPM)

3. (1)

-25~+70 10~40

(2) ()()

(3) ()(200)

()()()1000

1. A/DD/A2. 3. //1. 2.

5.3 I/O 1. 2. 4. 5. 6.

I/O

2. D B INTR MASK

3. I/O

1. 2. 3. 4.

5.4 1.

2. I/O

5.5 KK+1QQ+1

I/O CPU

1. INTR INTR = 1 MASK MASK = 1 CPU D

2. CPU 1#2#3#4#

3.

4.

I/O 1. CPU (1) (2) EINT = 1 EINT 1 EINT 0 D = 1 MASK = 0 CPU INTR 1

2. I/O DBR

1. (1) (2) (3) (4) I/O 2.

3.

8259A

CPU CPU I/O CPU I/O

5.6 DMA DMA 1. DMA

2. DMA (1) CPU CPU CPU

(2) DMA CPU CPU CPU DMA CPU DMA

(3) DMA CPU CPU

DMA 1. DMA (1) CPU DMA (2) (3) (4) (5) DMA

2. DMA +1+1

DMA 1. DMA (1) DMA /

CPU(2) DMA

(3)

(4)

(5) DMA

2. DMA (1) DMA

(2) DMA

3. DMA (1) (2) (3) (4) (5)

DMA 1.

2.

3. DMA