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Grayscale in mode 0xCB


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#1 huhn_m

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Posted 25 June 2003 - 09:02 AM

It seems as if this mode does NOT behave like described in Graph100 Programming manual.
Can anybody tell me how it works?

It is supposed to be coloum mode with grayscale and it looks kinda gray but it seems as
if the screen is divided up into 3 parts where the first part is the first buffer, the second is the second buffer
etc ... .

MODE 0xDB does not behave like that but behaves like described in the manual.

Please help me!!!!

#2 X-thunder28

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Posted 25 June 2003 - 10:22 AM

look that:

In CB:
memory (1 bloc represent 64 bytes)
[1st layer][2nd layer][3rd layer]
For go to the next collumn, you should incremente by 64*3 = 192 bytes!
mode CB use 3 layer who are like that:
123123123123123123123123123123123123123123123123
For the 1st layer, we have that:
1__1__1__1__1__1__1__1__1__1__1__1__1__1__1__1__
For the 2ndlayer, we have that:
_2__2__2__2__2__2__2__2__2__2__2__2__2__2__2__2_
For the 3rd layer, we have that:
__3__3__3__3__3__3__3__3__3__3__3__3__3__3__3__3
It seem identical to mode C3 but the column are distant of 192 bytes for the same layer!

In DB:
memory (1 bloc represent 1024 bytes)
[1er layer][2nd layer][3rd layer]
So we have that:
111111111111111122222222222222223333333333333333
Here, this is the same think that D3 because the layer in D3 is one layer on DB !




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