Sharp PC-4741 Service Manual page 23

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1 2 3 4_ 5 •. 6 7 8 -------- 79, 80
81 160 ,
161 240 '
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Fig. 3-24 V:RAM map in the 40 x25 text mode (AIT)
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Graphics mode
320 x 200 graphics (A IT)
• 640 x 200 graphics (A IT)
• 640 x 400 graphics (A IT)
The LCD circuit supports the 320 x 200 grapliics made, 640 x 200
graphics made, and 640 x 400 graphic made.
J
And this circuit
uaeS
bla~K for the f9regrpund calor and white far the
background color in both 640 x 200 and 640 x. 400 graphics modes.
Each pi*el in
the
320
x
200 graphics mode is presented by a 2 x 2
black qf LCD
scr~en
pixels.
V-RAM Dala (I byte)
1*15141*11101
t
y
y~
Fourth Display Pixel
I
I
L _ _ _ _ _
Third Display Pixel
' - - - - - - - Second Display Pixel
' - - - - - - - - - - First Display Pixel
320 x 200 graphics mode
V-RAM Data (I byte)
17161514131211101
I
First Display Pixel
Second Display Pixel
Third Display Pixei
Fourth Display Pixel
Fifth Display Pixel
Sixth rJisplay Pixel
Seventh Display Pixel
Eighth Display Pixel
640 x 200, 640 x 400 graphics mode
Fig_ 3'-.25
Sit
assignment
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Fig. 3-27 V-RAM map in the 640 x 200 graphics mode
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Fig. 3-28 V-FjAM map in the 640 x 400 graphi?" mode
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