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DMA




 

(Direct Memory Access, DMA) , . , DMA, .

♦ , Slave DMA, DMA, .

♦ , Bus Master DMA, ( , ). DMA , (. 6). DMA ATA, .

DMA , , , . DMA, , , . DMA , , ( , PCI, ISA ). DMA -, .

DMA , - (PIO). PIO , DMA . DMA -, DMA . DMA , ISA. DMA : DRQx DACKx#. PC/AT 7 DMA 8- ( 03) 16- (57), . 4 ( ). PC/XT 8- , 0 . DMA i8237, PC/XT AT. . 12.3.

 

12.3.

 

DMA#

0¹ 1 2 3 4² 5 6 7

XT MRFR - FDD HDD
AT
- - FDD - - - -
, 1 2
,
64 128 ,
1000h 2000h
8 A16-A23 7 A17-A23

:
087 083 081 082 08F 08 089 087
000 002 004 006 0C0 0C4 0C8 0CE
001 003 005 007 0C2 0C6 0 0

¹ 0 XT (MRFR).

² 4 PC/2 MCA.

 

16- DMA 57 ISA (bus mastering), DMA .

, DMA, ISA/EISA ( , LPT- ECP Fast Centronics, ). DMA, ISA.

, ISA, DMA PCI. DMA: PC/PCI DDMA. PC/PCI (. . 6.2.7) Intel ISA , - PCI. DDMA (Distributed DMA DMA) PCI. PCI ISA, ( ) CMOS Setup.

 





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