IBM T56A - Manual (Page 24)

A12
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.