Misc/abrash-black-book
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This commit is contained in:
James Gregory 2013-12-30 12:50:32 +11:00
commit 500e7f5654
353 changed files with 5091 additions and 5091 deletions
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32-02.html
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@ -39,15 +39,15 @@
<P><B>LISTING 32.1 L32-1.ASM</B></P>
<!-- CODE //-->
<PRE>
; Borland C/C&#43;&#43; tiny/small/medium model-callable assembler
; Borland C/C++ tiny/small/medium model-callable assembler
; subroutines to:
;* Set 360&#215;480 256-color VGA mode
;* Draw a dot in 360&#215;480 256-color VGA mode
;* Read the color of a dot in 360&#215;480 256-color VGA mode
;* Set 360x480 256-color VGA mode
;* Draw a dot in 360x480 256-color VGA mode
;* Read the color of a dot in 360x480 256-color VGA mode
;
; Assembled with TASM
;
; The 360&#215;480 256-color mode set code and parameters were provided
; The 360x480 256-color mode set code and parameters were provided
; by John Bridges, who has placed them into the public domain.
;
VGA_SEGMENT equ 0a000h ;display memory segment
@ -57,12 +57,12 @@ MAP_MASK equ 2 ;Map Mask register index in SC
READ_MAP equ 4 ;Read Map register index in GC
SCREEN_WIDTH equ 360 ;# of pixels across screen
WORD_OUTS_OK equ 1 ;set to 0 to assemble for
; computers that can&#146;t handle
; computers that can&rsquo;t handle
; word outs to indexed VGA registers
;
_DATAsegmentpublic byte &#145;DATA&#146;
_DATAsegmentpublic byte &lsquo;DATA&rsquo;
;
; 360&#215;480 256-color mode CRT Controller register settings.
; 360x480 256-color mode CRT Controller register settings.
; (Courtesy of John Bridges.)
;
vptbl dw 06b00h ; horz total
@ -100,18 +100,18 @@ else
endif
endm
;
_TEXTsegment byte public &#145;CODE&#146;
_TEXTsegment byte public &lsquo;CODE&rsquo;
assumecs:_TEXT, ds:_DATA
;
; Sets up 360&#215;480 256-color mode.
; Sets up 360x480 256-color mode.
; (Courtesy of John Bridges.)
;
; Call as: void Set360By480Mode()
;
; Returns: nothing
;
public _Set360&#215;480Mode
_Set360&#215;480Modeprocnear
public _Set360x480Mode
_Set360x480Modeprocnear
push si ;preserve C register vars
push di
mov ax,12h ; start with mode 12h
@ -154,9 +154,9 @@ _Set360&#215;480Modeprocnear
_Set360x480Modeendp
;
; Draws a pixel in the specified color at the specified
; location in 360&#215;480 256-color mode.
; location in 360x480 256-color mode.
;
; Call as: void Draw360&#215;480Dot(int X, int Y, int Color)
; Call as: void Draw360x480Dot(int X, int Y, int Color)
;
; Returns: nothing
;
@ -169,9 +169,9 @@ Color dw ? ;color in which to draw (in the
; range 0-255; upper byte ignored)
DParms ends
;
public _Draw360&#215;480Dot
_Draw360&#215;480Dotprocnear
push bp ;preserve caller&#146;s BP
public _Draw360x480Dot
_Draw360x480Dotprocnear
push bp ;preserve caller&rsquo;s BP
mov bp,sp ;point to stack frame
push si ;preserve C register vars
push di
@ -181,12 +181,12 @@ _Draw360&#215;480Dotprocnear
;there are 4 pixels at each address, so
; each 360-pixel row is 90 bytes wide
; in each plane
mul [bp&#43;DrawY] ;point to start of desired row
mov di,[bp&#43;DrawX] ;get the X coordinate
mul [bp+DrawY] ;point to start of desired row
mov di,[bp+DrawX] ;get the X coordinate
shr di,1 ;there are 4 pixels at each address
shr di,1 ; so divide the X coordinate by 4
add di,ax ;point to the pixel&#146;s address
mov cl,byte ptr [bp&#43;DrawX] ;get the X coordinate again
add di,ax ;point to the pixel&rsquo;s address
mov cl,byte ptr [bp+DrawX] ;get the X coordinate again
and cl,3 ;get the plane # of the pixel
mov ah,1
shl ah,cl ;set the bit corresponding to the plane
@ -195,18 +195,18 @@ _Draw360&#215;480Dotprocnear
mov dx,SC_INDEX
OUT_WORD ;set to write to the proper plane for
; the pixel
mov al,byte ptr [bp&#43;Color] ;get the color
mov al,byte ptr [bp+Color] ;get the color
stosb ;draw the pixel
pop di ;restore C register vars
pop si
pop bp ;restore caller&#146;s BP
pop bp ;restore caller&rsquo;s BP
ret
_Draw360&#215;480Dotendp
_Draw360x480Dotendp
;
; Reads the color of the pixel at the specified
; location in 360&#215;480 256-color mode.
; location in 360x480 256-color mode.
;
; Call as: int Read360&#215;480Dot(int X, int Y)
; Call as: int Read360x480Dot(int X, int Y)
;
; Returns: pixel color
;
@ -217,9 +217,9 @@ ReadX dw ? ;X coordinate from which to read
ReadY dw ? ;Y coordinate from which to read
RParms ends
;
public _Read360&#215;480Dot
_Read360&#215;480Dotprocnear
push bp ;preserve caller&#146;s BP
public _Read360x480Dot
_Read360x480Dotprocnear
push bp ;preserve caller&rsquo;s BP
mov bp,sp ;point to stack frame
push si ;preserve C register vars
push di
@ -229,12 +229,12 @@ _Read360&#215;480Dotprocnear
; each 360-pixel row is 90 bytes wide
; in each plane
mul [bp&#43;DrawY] ;point to start of desired row
mov si,[bp&#43;DrawX] ;get the X coordinate
mul [bp+DrawY] ;point to start of desired row
mov si,[bp+DrawX] ;get the X coordinate
shr si,1 ;there are 4 pixels at each address
shr si,1 ; so divide the X coordinate by 4
add si,ax ;point to the pixel&#146;s address
mov ah,byte ptr [bp&#43;DrawX] ;get the X coordinate again
add si,ax ;point to the pixel&rsquo;s address
mov ah,byte ptr [bp+DrawX] ;get the X coordinate again
and ah,3
;get the plane # of the pixel
mov al,READ_MAP
@ -245,9 +245,9 @@ _Read360&#215;480Dotprocnear
sub ah,ah ;make the return value a word for C
pop di ;restore C register vars
pop si
pop bp ;restore caller&#146;s BP
pop bp ;restore caller&rsquo;s BP
ret
_Read360&#215;480Dot endp
_Read360x480Dot endp
_TEX Tends
end
</PRE>