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APPENDIX
SIGNAL TIMING CHART
Horizontal
Vertical
fH (kHz)
A µsec
B µsec
C µsec
D µsec
E µsec
fv (Hz)
O msec
P msec
Q msec
R msec
S msec
Clock Fre.
(MHz)
Polarity
H. Sync.
V Sync.
Remark
IBM
VESA
VGA1/7OHz VGA2/70Hz
640x350 720x400
31 469
31 469
31.778
31.777
3.813
3.813
1.907
1.907
25.422
25.422
0.636
0.636
70.086
70 087
14.268
14.268
0.064
0.064
1.907
1.080
11.122
12.711
1.176
0.413
25.175
28.322
Positive Negative
Negative Positive
VGA3/60Hz
640x480
31 469
31.778
3.813
1.907
25.422
0.636
59.940
16.683
0.064
1.048
15.253
0.318
25.175
Negative
Negative
XGA/87iHz
640/72Hz
1024x768 640x480
35 522 37 861
28.151 26.413
3.920
1.270
1.247
4.064
22.806 20.317
0.178 0.762
86 958 72.809
11.500 13.735
0.113 0.079
0.563 0.739
10.810 12.678
0.014
0.237
44.900 31.500
Positive Negative
Positive Negative
I
nterlaced
800/56Hz
800x600
35 156
28.444
2.000
3.556
22.222
0.667
58 250
17.778
0 057
0.626
17.067
0.028
800/60Hz
800x600
37 879
26.400
3.200
2.200
20.000
1.000
60 317
16.579
0.106
0 607
15.840
0.026
640/75Hz
640x480
37.500
26.667
2.032
3.810
20.317
0.508
75.000
13.333
0.080
0.427
12.800
0.027
36.000 40.000
31.500
Pos./Neg.
Positive
Pos./Neg.
Positive
Negative
Negative
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