changing background colors using an increment???

[Netherbeast]

using the : mov eax, black+(backgroundColor*16)

how can I increment backgroundColor to display different colors without changing the color of the text?
I've tried to move backgroundColor to a register, increment the register then move it back to backgroundColor but it doesn't let me do that. Im very stuck right now.

 

[minsiz]

hello
you are using text mode
the background color is in the second byte (the first is the ascii and the second is the attribute)
bits 4, 5, 6 are for background so you preserve the first four bits and the last ( of blinking); add 1000h to ax (ax is the video memory text word) or 10001000 to eax ( tow words of memory)
i mean direct access to video text memory is easy then using bios int or other libreray

 

[AmkG]

Don't increment: add 16!

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