Hi,
So I'm toying with the V9990 for the first time, and I'd like to make at least something appear on screen.
So far, I have been :
. sending zero to output_ctrl port 6Fh
. selecting P1 mode by setting R#6 at 0000_0101b, R#7 at zero, and sending zero to P#7
. selecting palette mode PP by setting R#13 to zero
. writing 255 at VRAM address 00000h (which sets the first 2 pixels of pattern 0)
But nothing appears on screen (and I mean nothing).
I've checked the VRAM at 7C000h/7C001h, and it's already 0, so it should display pattern 0.
Maybe I have to set the palette ?
Or am I missing something ?
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