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MOV
AX, 512
SECTORS
MOV
DX, D1TC
OUT
DX, AX
; NOW WE NEED TO SET THE PARAMETERS FOR THE CHANNEL AS FOLLOWS:
;
;
DESTINATION
;
-----------
;
MEMORY SPACE
;
INCREMENT PTR
;
; TERMINATE ON TC, INTERRUPT, SOURCE SYNC, HIGH PRIORITY RELATIVE TO
; CHANNEL 0, BYTE XFERS, USE DRQ PIN FOR REQUEST SOURCE. ARM CHANNEL.
MOV
AX, 1010001101100110B
MOV
DX, D0CON
OUT
DX, AX
; REQUESTS ON DRQ1 WILL NOW RESULT IN TRANSFERS
CODE_SEG
ENDS
DATA_SEG
SEGMENT
SOURCE_DATA_1DB '80C186EC INTEGRATED PROCESSOR'
DEST_DATA_1DB
30 DUP('MITCH')
DISK_BUFF DB
512 DUP(?)
DATA_SEG
ENDS
END START
Example 10-1. Initializing the DMA Unit (Continued)
; THE DISK READS IN 512 BYTE
; XFER COUNT REG
SOURCE
------
I/O SPACE
CONSTANT PTR
; JUNK DATA FOR TEST
DIRECT MEMORY ACCESS UNIT
10-33
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