IBM 72H9623, T56A, 9483 system manual Video Memory Modes, Factory Preset Timing Signal Chart, A12

Video Memory Modes

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	B	A
C		F

Sync

D

E

			Mode1	Mode2	Mode3	Mode4	Mode5	Mode6	Mode7	Symbol
H	Polarity		+	-	-	-	-	-	+
	Frequency	kHz	31.468	31.468	31.469	35.00	37.861	37.50	35.156
O
R
	Total Period	pixels	800	900	800	864	832	840	1024	E
I
	Data Period	pixels	640	720	640	640	640	640	800	A
Z
O
	Blanking	pixels	160	180	160	224	192	200	224	B
N
	Front Porch	pixels	16	17	16	64	24	16	24	C
T
A	Pulse Width	pixels	96	108	96	64	40	64	72	D
L
	Back Porch	pixels	48	55	48	96	128	120	128	F
V	Polarity		-	+	-	-	-	-	+
	Frequency	Hz	70	70	60	66.67	72.8	75.0	56.25
E
R
	Total Period	lines	449	449	525	525	520	500	625	E
T
	Data Period	lines	350	400	480	480	480	480	600	A
I
C	Blanking	lines	99	49	45	45	40	20	25	B
A
	Front Porch	lines	37	13	10	3	9	1	1	C
L
	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
				(Text)
	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.

A12