Factory preset timing signal chart – IBM T56A User Manual
Page 24
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The monitor has 18 memory locations for display modes, 14 of which are factory
preset to popular video modes.
Factory Preset Timing Signal Chart
Video Memory Modes
Video
Sync
B
A
C
F
D
E
H
O
R
I
Z
O
N
T
A
L
V
E
R
T
I
C
A
L
(Text)
Mode1
Mode2
Mode3
Mode4
Mode5
Mode6
Mode7
Symbol
Polarity
+
-
-
-
-
-
+
Frequency
kHz
31.468
31.468
31.469
35.00
37.861
37.50
35.156
Total Period
pixels
800
900
800
864
832
840
1024
E
Data Period
pixels
640
720
640
640
640
640
800
A
Blanking
pixels
160
180
160
224
192
200
224
B
Front Porch
pixels
16
17
16
64
24
16
24
C
Pulse Width
pixels
96
108
96
64
40
64
72
D
Back Porch
pixels
48
55
48
96
128
120
128
F
Polarity
-
+
-
-
-
-
+
Frequency
Hz
70
70
60
66.67
72.8
75.0
56.25
Total Period
lines
449
449
525
525
520
500
625
E
Data Period
lines
350
400
480
480
480
480
600
A
Blanking
lines
99
49
45
45
40
20
25
B
Front Porch
lines
37
13
10
3
9
1
1
C
Pulse Width
lines
2
2
2
3
3
3
2
D
Back Porch
lines
60
34
33
39
28
16
22
F
Resolution
640
720
640
640
640
640
800
x350
x400
x480
x480
x480
x480
x600
Recall
YES
YES
YES
YES
YES
YES
YES
Note : Timings are as detailed in VESA “Display Monitor Timing Specification”. Version 1.0,
Revision 0.7, Dated 12/18/96.