X01.os.1:bios Interrupt

It's just a little prep work. In order to display the string, you need to call interrupt: int 0x10 (ah=0x13). Specific parameter settings, refer to my summary of the following:

INT ten (AH = 0)

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Function: Set display mode
Call Parameters:
AL = 00:40 * 25 black and white Way
01:40 * 25 Color mode
02:80 * 25 black and white Way
03:80 * 25 Color mode
04:320 * 200 Color graphic mode
05:320 * 200 Black and white graphic mode
06:640 * 200 Black and white graphic mode
07:80 * 25 Monochrome text mode
08:160 * 200 16 Color graphics (PCJR)
09:320 * 200 16 Color graphics (PCJR)
0a:640 * 200 16 Color graphics (PCJR)
0B: Reserved (EGA)
0C: Reserved (EGA)
0D:320 * 200 Color graphics (EGA)
0e:640 * 200 Color graphics (EGA)
0f:640 * 350 Black and white graphics (EGA)
10:640 * 350 Color graphics (EGA)
11:640 * 480 Monochrome graphics (EGA)
12:640 * 480 16 Color Graphics (EGA)
13:320 * 200 256 color graphics (EGA)
40:80 * 30 Color graphics (CGE400)
41:80 * 50 Color graphics (CGE400)
42:640 * 400 Color graphics (CGE400)

INT ten (AH = 1)
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Function: Set Cursor type
Call Parameters:
CH (0-3) = cursor start line
CL (0-3) = Cursor End line

INT ten (AH = 2)
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Function: Place cursor position
Call Parameters:
BH = page number
DH,DL = row, column

INT ten (AH = 3)
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Function: Read cursor position
Call Parameters:
BH = page number
Return parameters:
CH = cursor start line
DH,DL = row, column

INT ten (AH = 4)
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Function: Read stylus position
Return parameters:
AH = 0: Stylus not triggered
1: Light Stroke hair
CH = like Motoyuki
BX = Pixel Column
DH = character lines
DL = Character column

INT Ten (AH = 5)
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Features: Display page
Call Parameters:
AL = page number

INT Ten (AH = 6)
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Features: screen initialization or roll up
Call Parameters:
AL = volume of rows
0: Entire window blank
BH = Entangled line property
CH = upper left corner line number
CL = upper left corner column number
DH = lower right corner line number
DL = lower right column number

INT ten (AH = 7)
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Features: screen initialization or volume down
Call Parameters:
AL = number of rows under volume
0: Entire window blank
BH = Entangled line property
CH = upper left corner line number
CL = upper left corner column number
DH = lower right corner line number
DL = lower right column number

INT ten (AH = 8)
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Function: Read the characters and properties of the cursor position
Call Parameters:
BH = Display Page
Return parameters:
AH = Property
AL = character

INT Ten (AH = 9)
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Function: Displays characters and their properties at the cursor position
Call Parameters:
BH = Display Page
AL = character
BL = attribute
CX = number of characters repeats

INT ten (AH = A)
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Function: Displays characters at the cursor position
Call Parameters:
BH = Display Page
AL = character
CX = number of characters repeats

INT ten (AH = B)
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Function: color palette (320 * 320 graphics)
Call Parameters:
BH = color palette ID
BL = and ID matching colors used

INT ten (AH = C)
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Function: Write pixel
Call Parameters:
DX = line (0--199)
CX = column (0--639)
AL = pixel value

INT ten (AH = D)
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function: Read pixels
Call Parameters:
DX = line (0--199)
CX = column (0--639)
Return parameters:
AL = pixel value

INT ten (AH = E)
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Function: Display character (cursor forward)
Call Parameters:
AL = character
BL = foreground color

INT ten (AH = F)
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Function: Take the current display mode
Return parameters:
AH = number of character columns
AL = display Mode

INT ten (AH = 13)
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Function: Display string (for at)
Call parameter:; return parameter
ES:BP = string Address
CX = string length
DH,DL = Start Row, column
BH = page number
AL = 0,BL = Property
String: Char,char,... The cursor returns to the starting position.
AL = 1,BL = property; cursor follows move
String: Char,char,...
AL = 2; The cursor returns to the starting position
String: Char,char,...
AL = 3; Cursor follows move
String: Char,char,...

INT 11
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Function: Device check
Return parameters:
AX = return value
BIT0 = 1: Equipped with a disk
Bit1 = 1:80,287 coprocessor
bit4,5 = 10:40 * BW (color board)
01:80 * BW (color board)
11:80 * BW (Black and white board)
bit6,7 = floppy disk drive
bit9,10,11 = RS-232 Plate number
bit12 = Game Adapter
bit14,15 = printer Number

INT 12
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Function: Measuring memory capacity
Return parameters:
AX = number of bytes (KB)

INT (AH = 0)
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Function: Floppy disk system reset

INT (AH = 1)
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Function: Read floppy status
Return parameters:
AL = Status byte

INT (AH = 2)
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Function: Read disk
Call Parameters:
AL = number of sectors
CH,CL = track number, sector area code
DH,DL = magnetic number, drive letter
ES:BX = Data buffer Address
Return parameters:
Success: AH = 0,al = number of sectors Read
Failed: AH = error code

INT (AH = 3)
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Function: Write disk
Call Parameters:
AL = number of sectors
CH,CL = track number, sector area code
DH,DL = magnetic number, drive letter
ES:BX = Data buffer fetch Address
Return parameters:
Success: AH = 0, AL = number of sectors written
Failed: AH = error code

INT (AH = 4)
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Function: Verify disk sector
Call Parameters:
AL = number of sectors
CH,CL = track number, sector area code
DH,DL = magnetic number, drive letter
Return parameters:
Success: AH = 0,al = number of sectors inspected
Failed: AH = error code

INT (AH = 5)
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Function: Format disc track
Call Parameters:
ES:BX = Track Address
Return parameters:
Success: AH = 0
Failed: AH = error code

INT (AH = 0)
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Function: Initialize serial communication port
Call Parameters:
AL = Initialization Parameters
DX = Communication slogan (0,1)
Return parameters:
AH = Communication Port Status
AL = Modem Status

INT (AH = 1)
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Function: Write character to serial communication port
Call Parameters:
AL = character
DX = Communication slogan (0,1)
Return parameters:
Write success: AH (7) = 0
Write failure: AH (7) = 1
AH (0-6) = Communication Port Status

INT (AH = 2)
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Function: Read characters from serial communication port
Call Parameters:
DX = Communication slogan (0,1)
Return parameters:
Read success: AH (7) = 0, AL = character
Read failure: AH (7) = 1
AH (0-6) = Communication Port Status

INT (AH = 3)
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Function: Take the communication port status
Call Parameters:
DX = Communication slogan (0,1)
Return parameters:
AH = Communication Port Status
AL = Modem Status

INT (AH = 0)
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Function: Start the cassette-type tape motor

INT (AH = 1)
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Function: Stop cassette motor

INT (AH = 2)
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Function: Tape block read
Call Parameters:
ES:BX = data Transfer area address
CX = number of bytes
Return parameters:
AH = Status byte
00: Read Success
01: Redundancy Test Error
02: No Data transfer
04: No Boot
08: Illegal Order

INT (AH = 3)
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Function: Tape chunked write
Call Parameters:
DS:BX = data Transfer area address
CX = number of bytes
Return parameters:
Ditto

INT (AH = 0)
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Function: Read characters from keyboard
Return parameters:
AL = character code
AH = Scan Code

INT (AH = 1)
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Function: Read keyboard buffer characters
Return parameters:
ZF = 0:al = character code, AH = Scan code
ZF = 1: Buffer empty

INT (AH = 2)
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Function: Take keyboard status byte
Return parameters:
AL = Keyboard State byte

INT (AH = 0)
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Function: print character, loopback status byte
Call Parameters:
AL = character
DX = printer Number
Return parameters:
AH = Printer Status byte

INT (AH = 1)
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Function: Initialize printer, loopback status byte
Call Parameters:
DX = printer Number
Return parameters:
AH = Printer Status byte

INT (AH = 2)
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function: Take status byte
Call Parameters:
DX = printer Number
Return parameters:
AH = Printer Status byte

INT 1 A (AH = 0)
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function: Read clock
Return parameters:
CH:CL = time: Minute
Dh:dl = seconds: 1/100 seconds

INT 1 A (AH = 1)
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Function: Set clock
Call Parameters:
CH:CL = time: Minute
Dh:dl = seconds: 1/100 seconds

INT 1 A (AH = 2)
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Function: Read real time clock (for at)
Return parameters:
CH:CL = time: Minute (BCD)
DH:DL = seconds: 1/100 sec (BCD)

INT 1 A (AH = 6)
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Function: Set alarm time (for at)
Call Parameters:
CH:CL = time: Minute (BCD)
DH:DL = seconds: 1/100 sec (BCD)

INT 1 A (AH = 7)
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Function: Clear alarm (for at)