Subject: RE: [stella] combat scanlines? From: Nicolás Olhaberry <nolh@xxxxxxxxxxxxx> Date: Fri, 4 Jan 1980 07:06:21 -0300 |
----- Original Message ----- From: ben <ben@xxxxxxxx> To: <stella@xxxxxxxxxxx> Sent: Saturday, November 03, 2001 8:43 PM Subject: [stella] combat scanlines? > Can someone please let me know how many visible scanlines Combat assumes to > display the entire playfield and scores? Since VBLANK ends on line 36 and VSYNC starts on 260, a combat frame has 224 visible scanlines. How many are really visible on a TV, I´m not sure. I´ve read on this list (if I remember right) that the newer ones can display up to 210 atari lines on NTSC. > I have tried everything, and am pretty sure Combat assumes the Overscan > area is *visible* (ie needs to show 40-261, not the expected 40-231). Is > this true? I haven´t played combat on a real atari for at least 10 years, but I don´t remember that the bottom border was that thick, it was pretty much the same size of the upper border. So, I think they expected that the last lines of the frame will fall in the overscan area. > How many scanlines are you emu authors showing, and is it always constant > for every cart/machine? What happens with PAL/NTSC? I don´t know for sure in which scanline the visible screen starts or stops, and maybe that changes with the TV set too. So, the simpler solution from a emu point of view is just to display every line with the VBLANK register turned off. Most of the games on NTSC don´t have more than 200 of those, just a few like combat use a little more. So, you can have a big bitmap with, let say, 256 lines to be safe, and show just a portion of it, using a resolution like 320x200 or 320x240 for the "taller" games. Bye, Nicolás. ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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