, . . . . , , , . . , , , , , . .
- , (). , . . , , , .
, 8- 16- . DMA , . ( ). DMA . , DMA, IRQ , . , . OCR, , . , . , . .
SCSI
SCSI (Small Computer System Interface) , . SCSI, . SCSI 7 . , SCSI ( IBM PC, Macintosh, Sun ). flatbed- SCSI.
(RS232)
, DMA (Direct Memory Access ) - . , . , , .
, . , , , DMA.