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Welcome to IWETHEY!

New Frantic's now playable
Something to remember when viewing this - the Atari only has 2 sprites and 2 missiles.

http://www.youtube.c...tch?v=wRxdl2T8nlQ

The color's didn't come out well with the camera, here's a screen capture video of the new stealth mode
http://www.spiceware...ranticStealth.mov

I'm able to draw all those robots by repositioning the sprites on the fly as the screen is drawn. One of them takes 2 scan lines to reposition, the other 3. The ARM code implements a flicker routine for the instances when there are more than 2 sprites in the same horizontal band. This is noticeable in the screen capture video, especially the first room where there are 5 robots at the bottom of the screen. On a real CRT the flicker isn't as bad as in the screen capture as the phosphors glow long enough to make it more subtle. However, it's not as good as the YouTube video where no flicker is apparent.

If you'd like to try it out yourself you can use Stella.
http://stella.sourceforge.net/

Instructions in the first post, along with a link to the rely with the latest build.
http://www.atariage....560-frantic-2600/
New Reminds me of Shamus
http://en.wikipedia....hamus_(video_game)

Very nice.
Regards,
-scott
Welcome to Rivendell, Mr. Anderson.
New Thanks!
I'd forgotten about Shamus - have it for my Vic 20.
New took a diversion
http://www.youtube.c...tch?v=uErk65UgCpo

in contrast, here's the original version of Asteroids for it.
http://www.youtube.c...tch?v=JEsJJe5y8Kk

To deal with al the objects on the original version they flicker everything. One frame of video displays the ship, enemy saucer, and the player's shots. The other frame draws all the asteroids and the saucer's shots. To prevent further flicker, the asteroids move up/down at a constant rate of speed. This allows one of the two sprites to draw all the upward moving asteroids (as they never cross each other's path) while the other sprite draws all the downward moving asteroids. The only speed variation is in the left/right movement. Some game variations add additional left/right speeds, but they're still quite limited.

In my version I reuse both sprites to draw everything and only flicker if more than 3 objects occupy the same horizontal zone. I always flicker the two missiles and ball in order to draw up to 6 shots (4 for the player, 2 for the saucer)
     Its baaack! - (beepster) - (18)
         saw that a while back - (SpiceWare) - (17)
             The other interesting piece - (beepster) - (16)
                 don't need an emulator - (SpiceWare) - (15)
                     Just wondering ... - (drook) - (14)
                         You haven't spoken to any synthesizor fanatics, then. - (static) - (2)
                             Ensoniq EPS here. - (malraux) - (1)
                                 Cool. -NT - (static)
                         Non sequitur.. - (Ashton)
                         sure - it's just a hobby - (SpiceWare) - (9)
                             The cartridge is more powerful than the console? :-D - (static) - (3)
                                 Yep - (SpiceWare) - (2)
                                     I can see why you enjoy the challenge! :-) -NT - (static) - (1)
                                         digitized audio on the 2600 - (SpiceWare)
                             Looks like Tempest ... I loved that game - (drook)
                             Frantic's now playable - (SpiceWare) - (3)
                                 Reminds me of Shamus - (malraux) - (1)
                                     Thanks! - (SpiceWare)
                                 took a diversion - (SpiceWare)

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