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page.8
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1986-06-06
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901b
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23 lines
; Following is a minimal program for sending a sequence of bytes to the
; PRN printer-device. The codes that are sent appear in the DB statement
; following the label CODES.
PRINT_CODES:
MOV DX,PRN_NAME ; point to the printer's device name
MOV AX,03D01 ; MSDOS codes for "open for writing"
INT 33 ; call MSDOS to open the printer device
XCHG BX,AX ; swap the printer's open-file handle into BX
MOV DX,CODES ; point to the codes we are outputting
MOV CX,LENGTH ; load the number of code bytes
MOV AH,040 ; MSDOS code for "write"
INT 33 ; write the codes to the printer
MOV AX,04C00 ; MSDOS codes for "successful process termination"
INT 33 ; go back to the operating system
PRN_NAME:
DB 'PRN',0
CODES:
DB 0C ; single form-feed for the PAGE program
LENGTH EQU $-CODES