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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30
24-02.html
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@ -39,14 +39,14 @@
<P><B>LISTING 24.1 L24-1.ASM</B></P>
<!-- CODE //-->
<PRE>
; Program to illustrate operation of ALUs and latches of the VGA&#146;s
; Program to illustrate operation of ALUs and latches of the VGA&rsquo;s
; Graphics Controller. Draws a variety of patterns against
; a horizontally striped background, using each of the 4 available
; logical functions (data unmodified, AND, OR, XOR) in turn to combine
; the images with the background.
; By Michael Abrash.
;
stack segment para stack &#145;STACK&#146;
stack segment para stack &lsquo;STACK&rsquo;
db 512 dup(?)
stack ends
;
@ -69,23 +69,23 @@ GC_ROTATE equ 3 ;GC data rotate/logical function
; register index
GC_MODE equ 5 ;GC mode register index
;
dseg segment para common &#145;DATA&#146;
dseg segment para common &lsquo;DATA&rsquo;
;
; String used to label logical functions.
;
LabelString label byte
db &#145;UNMODIFIED AND OR XOR &#146;
db &lsquo;UNMODIFIED AND OR XOR &rsquo;
LABEL_STRING_LENGTH equ $-LabelString
;
; Strings used to label fill patterns.
;
FillPatternFF db &#145;Fill Pattern: 0FFh&#146;
FillPatternFF db &lsquo;Fill Pattern: 0FFh&rsquo;
FILL_PATTERN_FF_LENGTH equ $ - FillPatternFF
FillPattern00 db &#145;Fill Pattern: 000h&#146;
FillPattern00 db &lsquo;Fill Pattern: 000h&rsquo;
FILL_PATTERN_00_LENGTH equ $ - FillPattern00
FillPatternVert db &#145;Fill Pattern: Vertical Bar&#146;
FillPatternVert db &lsquo;Fill Pattern: Vertical Bar&rsquo;
FILL_PATTERN_VERT_LENGTH equ $ - FillPatternVert
FillPatternHorz db &#145;Fill Pattern: Horizontal Bar&#146;
FillPatternHorz db &lsquo;Fill Pattern: Horizontal Bar&rsquo;
FILL_PATTERN_HORZ_LENGTH equ $ - FillPatternHorz
;
dseg ends
@ -112,7 +112,7 @@ TEXT_UP macro TEXT_STRING, TEXT_LENGTH, ROW, COLUMN
int 10h
endm
;
cseg segment para public &#145;CODE&#146;
cseg segment para public &lsquo;CODE&rsquo;
assume cs:cseg, ds:dseg
start proc near
mov ax,dseg
@ -174,15 +174,15 @@ BackgroundLoop:
; Label the screen.
;
push ds
pop es ;strings we&#146;ll display are passed to BIOS
pop es ;strings we&rsquo;ll display are passed to BIOS
; by pointing ES:BP to them
;
; Label the logical functions, using the VGA BIOS&#146;s
; Label the logical functions, using the VGA BIOS&rsquo;s
; write string function.
;
TEXT_UP LabelString, LABEL_STRING_LENGTH, 24, 0
;
; Label the fill patterns, using the VGA BIOS&#146;s
; Label the fill patterns, using the VGA BIOS&rsquo;s
; write string function.
;
TEXT_UP FillPatternFF, FILL_PATTERN_FF_LENGTH, 3, 42
@ -190,7 +190,7 @@ BackgroundLoop:
TEXT_UP FillPatternVert, FILL_PATTERN_VERT_LENGTH, 15, 42
TEXT_UP FillPatternHorz, FILL_PATTERN_HORZ_LENGTH, 21, 42
;
; Wait until a key&#146;s been hit to reset screen mode &amp exit.
; Wait until a key&rsquo;s been hit to reset screen mode &amp exit.
;
WaitForKey:
mov ah,1
@ -230,7 +230,7 @@ RowLoop:
mov cx,WIDTH
ColumnLoop:
mov ah,es:[di] ;load display memory contents into
; GC latches (we don&#146;t actually care
; GC latches (we don&rsquo;t actually care
; about value read into AH)
stosb ;write pattern, which is logically
; combined with latch contents for each
@ -260,7 +260,7 @@ HorzBarLoop:
dec ax ;0ffh fill (smaller to do word than byte DEC)
mov cx,si ;width to fill
HBLoop1:
mov bl,es:[di] ;load latches (don&#146;t care about value)
mov bl,es:[di] ;load latches (don&rsquo;t care about value)
stosb ;write solid pattern, through ALUs
loop HBLoop1
add di,SCREEN_WIDTH_IN_BYTES - VERTICAL_BOX_WIDTH_IN_BYTES