Misc/abrash-black-book
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This commit is contained in:
James Gregory 2013-12-30 18:34:31 +11:00
commit 18011c595a
352 changed files with 6040 additions and 6040 deletions
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22
29-05.md
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@ -4,16 +4,16 @@
### Overscan {#Heading5}
While we’re at it, I’m going to touch on overscan. Overscan is the color
While we're at it, I'm going to touch on overscan. Overscan is the color
of the border of the display, the rectangular area around the edge of
the monitor that’s outside the region displaying active video data but
the monitor that's outside the region displaying active video data but
inside the blanking area. The overscan (or border) color can be
programmed to any of the 64 possible colors by either setting Attribute
Controller register 11H directly or calling video function 10H,
subfunction 1.
------------------- ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
![](images/i.jpg) *On ECD-compatible monitors, however, there’s too little scan time to display a proper border when the EGA is in 350-scan-line mode, so overscan should always be 0 (black) unless you’re in 200-scanmode. Note, though, that a VGA can easily display a border on a VGA-compatible monitor, and VGAs are in fact programmed at mode set for an 8-pixel-wide border in all modes; all you need do is set the overscan color on any VGA to see the border.*
![](images/i.jpg) *On ECD-compatible monitors, however, there's too little scan time to display a proper border when the EGA is in 350-scan-line mode, so overscan should always be 0 (black) unless you're in 200-scanmode. Note, though, that a VGA can easily display a border on a VGA-compatible monitor, and VGAs are in fact programmed at mode set for an 8-pixel-wide border in all modes; all you need do is set the overscan color on any VGA to see the border.*
------------------- ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
### A Bonus Blanker {#Heading6}
@ -44,16 +44,16 @@ screen blanking.
int 21h
endm
;
stack segment para stack ‘STACK’
stack segment para stack ‘STACK'
db512 dup (?)
stack ends
;
Data segment word ‘DATA’
SampleText db ‘This is bit-mapped text, drawn in hi-res ’
db ‘EGA graphics mode 10h.’, 0dh, 0ah, 0ah
db ‘Press any key to blank the screen, then ’
db ‘any key to unblank it,’, 0dh, 0ah
db ‘then any key to end.$’
Data segment word ‘DATA'
SampleText db ‘This is bit-mapped text, drawn in hi-res '
db ‘EGA graphics mode 10h.', 0dh, 0ah, 0ah
db ‘Press any key to blank the screen, then '
db ‘any key to unblank it,', 0dh, 0ah
db ‘then any key to end.$'
Data ends
;
Code segment
@ -68,7 +68,7 @@ screen blanking.
; hi-res graphics mode
int 10h ;BIOS video interrupt
;
; Put up some text, so the screen isn’t empty.
; Put up some text, so the screen isn't empty.
;
mov ah,9 ;DOS print string function
mov dx,offset SampleText