Re: A89: faster LCD update on HW2 ?
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Re: A89: faster LCD update on HW2 ?
Johan wrote:
> (Argh! Poor design! I just realized that the DMA most likely does *byte*
> reads from RAM on HW1s AND that it reads 128 lines while only 100 lines are
> visible! This would explain how it can use 10% of the bus bandwidth, slowing
> down the CPU to ~9MHz when the memory needs to be accessed often, like most
> of the time... :v( )
You probably already know this, but you can change how many scanlines the lcd
has (will read), with port $600013. It containes ($100 - numberofscanlines).
thats $80 for default.
//Olle
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