A86: Re: how writing to the lcd works
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A86: Re: how writing to the lcd works
It's NOT a direct relation between the actual memory and the display. It's
a hardware process. The hardware scans the current video memory and
refreshes the LCD. It has something to do with interrupt speed, as changing
the interrupt speed will cause the LCD to be duplicated in some parts, but
no one knows more than that. Port 4 can also be used to change the width in
bytes of video memory, but I don't know how'd it work since I've never
tried.
>
> i have a question which could be considered a hardware question, but you
asm
> hopefully can answer it as it deals somewhat with asm...
>
> ok so the graphics port points to the area of mem where the image that
will
> be on the screen is stored. Am i actually writing right to the lcd
> hardware. can anyone tell me how the data in the area of mem pointed to
by
> the graphics port gets to the lcd.
>
> the lcd is 128 x 64 pixels = 1024 bytes ... 8192 bits or 8192 possible
place
> that can be turned on or off...
>
> so inside from between somewhere and the lcd there are 128 wires
> across....how does it do the 64 down....
>
> the main thing i need to know is this a software process or a hardware
> process to organize and take and put the right data from mem to send the
> right electrons up the 128 wires to the right height.
>
> if this is a software process...does anyone know where in the rom this is.
>
> if not could someone explain how this does work.
>
> it will have asm implications for a project i'm doing...if i can figure it
> out...
>
> new lcd....
>
> thank you for yer time
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