下面我有一个代码，用3种不同颜色绘制3个圆圈..很好.. 但是如何添加文本字符串？谢谢。 我在virtualbox（windows）上做了一些测试，但没有运气.. 任何想法让它成功吗？
BITS 16
ORG 100h
push 0a000h ;Video memory graphics segment
pop es
mov ax, 0013h ;320x200@8bpp
int 10h
push 0Eh ;Blue
push 10 ;cX
push 10 ;cY
push 10 ;Radius
call drawFilledCircle
push 02h ;Blue
push 40 ;cX
push 40 ;cY
push 30 ;Radius
call drawFilledCircle
push 06h ;Blue
push 140 ;cX
push 100 ;cY
push 70 ;Radius
call drawFilledCircle
;Wait for a key
xor ah, ah
int 16h
loc db "KERNEL IMG"
.LOOP:
push cx
mov cx, 0x000B ; eleven character name
mov si, loc
; image name to find
push di
rep cmpsb ; test for entry match
pop di
;je LOAD_FAT
pop cx
add di, 0x0020 ; queue next directory entry
loop .LOOP
;jmp FAILURE
;Restore text mode
mov ax, 0003h
int 10h
;Return
mov ax, 4c00h
int 21h
;Color
;cX
;cY
;R
drawFilledCircle:
push bp
mov bp, sp
sub sp, 02h
mov cx, WORD [bp+04h] ;R
mov ax, cx
mul ax ;AX = R^2
mov WORD [bp-02h], ax ;[bp-02h] = R^2
mov ax, WORD [bp+06h]
sub ax, cx ;i = cY-R
mov bx, WORD [bp+08h]
sub bx, cx ;j = cX-R
shl cx, 1
mov dx, cx ;DX = Copy of 2R
.advance_v:
push cx
push bx
mov cx, dx
.advance_h:
;Save values
push bx
push ax
push dx
;Compute (i-y) and (j-x)
sub ax, WORD [bp+06h]
sub bx, WORD [bp+08h]
mul ax ;Compute (i-y)^2
push ax
mov ax, bx
mul ax
pop bx ;Compute (j-x)^2 in ax, (i-y)^2 is in bx now
add ax, bx ;(j-x)^2 + (i-y)^2
cmp ax, WORD [bp-02h] ;;(j-x)^2 + (i-y)^2 <= R^2
;Restore values before jump
pop dx
pop ax
pop bx
ja .continue ;Skip pixel if (j-x)^2 + (i-y)^2 > R^2
;Write pixel
push WORD [bp+0ah]
push bx
push ax
call writePx
.continue:
;Advance j
inc bx
loop .advance_h
;Advance i
inc ax
pop bx ;Restore j
pop cx ;Restore counter
loop .advance_v
add sp, 02h
pop bp
ret 08h
;Color
;X
;Y
writePx:
push bp
mov bp, sp
push ax
push bx
mov bx, WORD [bp+04h]
mov ax, bx
shl bx, 6
shl ax, 8
add bx, ax ;320 = 256 + 64
add bx, WORD [bp+06h]
mov ax, WORD [bp+08h]
;TODO: Clip
mov BYTE [es:bx], al
pop bx
pop ax
pop bp
ret 06h
times 510-($-$$) db 0 ; Fill the rest with zeros
dw 0xAA55 ; Boot loader signature
答案 0 :(得分：1)
但是如何添加文本字符串？
您决定使用320x200 256色视频模式13h 要输出文本，您可以使用处理文本输出的每个BIOS功能，就像在文本视频屏幕上一样。
此视频模式使用8x8字体，因此您可以将光标定位在任何40x25 = 1000个字符单元格中。
在屏幕中央写下红色大写 B 的示例：
mov dx, 0C14h ;DH=12 row, DL=20 column
mov bh, 0 ;BH=0 display page
mov ah, 02h ;AH=02h set cursor position function
int 10h ;video BIOS interrupt
mov bx, 000Ch ;BH=0 display page, BL=12 red
mov ax, 0E42h ;AH=0Eh teletype function, AL=66 capital B
int 10h ;video BIOS interrupt
答案 1 :(得分：-1)
BITS 16
[ORG 0x7C00]
;ORG 100h
push 0a000h ;Video memory graphics segment
pop es
mov ax, 0013h ;320x200@8bpp
int 10h
push 0Eh ;Blue
push 10 ;cX
push 10 ;cY
push 10 ;Radius
call drawFilledCircle
push 02h ;Blue
push 40 ;cX
push 40 ;cY
push 30 ;Radius
call drawFilledCircle
push 06h ;Blue
push 140 ;cX
push 100 ;cY
push 70 ;Radius
call drawFilledCircle
;Wait for a key
;xor ah, ah
;int 16h
main: ; Label for the start of the main program
mov ax,0x0000 ; Setup the Data Segment register
; Location of data is DS:Offset
mov ds,ax ; This can not be loaded directly it has to be in two steps.
; 'mov ds, 0x0000' will NOT work due to limitations on the CPU
mov si, HelloWorld ; Load the string into position for the procedure.
call PutStr ; Call/start the procedure
;jmp $ ; Never ending loop
; Procedures
PutStr: ; Procedure label/start
; Set up the registers for the interrupt call
mov ah,0x0E ; The function to display a chacter (teletype)
mov bh,0x00 ; Page number
mov bl,0x07 ; Normal text attribute
.nextchar ; Internal label (needed to loop round for the next character)
lodsb ; I think of this as LOaD String Block
; (Not sure if thats the real meaning though)
; Loads [SI] into AL and increases SI by one
; Check for end of string '0'
or al,al ; Sets the zero flag if al = 0
; (OR outputs 0's where there is a zero bit in the register)
jz .return ; If the zero flag has been set go to the end of the procedure.
; Zero flag gets set when an instruction returns 0 as the answer.
int 0x10 ; Run the BIOS video interrupt
jmp .nextchar ; Loop back round tothe top
.return ; Label at the end to jump to when complete
; ret ; Return to main program
;Wait for a key
xor ah, ah
int 16h
push 01h ;Blue
push 100 ;cX
push 90 ;cY
push 140 ;Radius
call drawFilledCircle
;ret
; Data
HelloWorld db ' WELCOME !! Press Enter ',10,10,0
loc db "KERNEL IMG"
.LOOP:
push cx
mov cx, 0x000B ; eleven character name
mov si, loc
; image name to find
push di
rep cmpsb ; test for entry match
pop di
;je LOAD_FAT
pop cx
add di, 0x0020 ; queue next directory entry
loop .LOOP
;jmp FAILURE
;Restore text mode
mov ax, 0003h
int 10h
;Return
mov ax, 4c00h
int 21h
;Color
;cX
;cY
;R
drawFilledCircle:
push bp
mov bp, sp
sub sp, 02h
mov cx, WORD [bp+04h] ;R
mov ax, cx
mul ax ;AX = R^2
mov WORD [bp-02h], ax ;[bp-02h] = R^2
mov ax, WORD [bp+06h]
sub ax, cx ;i = cY-R
mov bx, WORD [bp+08h]
sub bx, cx ;j = cX-R
shl cx, 1
mov dx, cx ;DX = Copy of 2R
.advance_v:
push cx
push bx
mov cx, dx
.advance_h:
;Save values
push bx
push ax
push dx
;Compute (i-y) and (j-x)
sub ax, WORD [bp+06h]
sub bx, WORD [bp+08h]
mul ax ;Compute (i-y)^2
push ax
mov ax, bx
mul ax
pop bx ;Compute (j-x)^2 in ax, (i-y)^2 is in bx now
add ax, bx ;(j-x)^2 + (i-y)^2
cmp ax, WORD [bp-02h] ;;(j-x)^2 + (i-y)^2 <= R^2
;Restore values before jump
pop dx
pop ax
pop bx
ja .continue ;Skip pixel if (j-x)^2 + (i-y)^2 > R^2
;Write pixel
push WORD [bp+0ah]
push bx
push ax
call writePx
.continue:
;Advance j
inc bx
loop .advance_h
;Advance i
inc ax
pop bx ;Restore j
pop cx ;Restore counter
loop .advance_v
add sp, 02h
pop bp
ret 08h
;Color
;X
;Y
writePx:
push bp
mov bp, sp
push ax
push bx
mov bx, WORD [bp+04h]
mov ax, bx
shl bx, 6
shl ax, 8
add bx, ax ;320 = 256 + 64
add bx, WORD [bp+06h]
mov ax, WORD [bp+08h]
;TODO: Clip
mov BYTE [es:bx], al
pop bx
pop ax
pop bp
ret 06h
times 510-($-$$) db 0 ; Fill the rest with zeros
dw 0xAA55 ; Boot loader signature