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Frogger


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How does the Intellivision version of Frogger appear to have more than 8 moving objects at a time? I noticed the vehicles in the road don't move very smoothly. Does this mean they are part of the background? Same with the things in the river.

You're exactly right. The cars and the logs are part of the background.

 

The Intellivision background is made up of characters (cards). Some of these are predefined, like the alphabet, but other can be defined by the programmer.

 

The program can use some of the custom characters to create an animation sequence. It is easiest to do this if the objects only move horizontally or vertically, which is great for frogger.

 

As an example, here is an animation sequence for a tank moving left to right:

 

gfx_row   "........"	  "........"
gfx_row   "..####.."	  "........"
gfx_row   "........"	  "........"
gfx_row   "...##..."	  "........"
gfx_row   "...###.."	  "........"
gfx_row   "...##..."	  "........"
gfx_row   "........"	  "........"
gfx_row   "..####.."	  "........"

gfx_row   "........"	 "........"
gfx_row   "....####"	 "........"
gfx_row   "........"	 "........"
gfx_row   ".....##."	 "........"
gfx_row   ".....###"	 "........"
gfx_row   ".....##."	 "........"
gfx_row   "........"	 "........"
gfx_row   "....####"	 "........"

gfx_row   "........"	 "........"
gfx_row   "......##"	 "##......"
gfx_row   "........"	 "........"
gfx_row   ".......#"	 "#......."
gfx_row   ".......#"	 "##......"
gfx_row   ".......#"	 "#......."
gfx_row   "........"	 "........"
gfx_row   "......##"	 "##......"

gfx_row   "........"	 "........"
gfx_row   "........"	 "####...."
gfx_row   "........"	 "........"
gfx_row   "........"	 ".##....."
gfx_row   "........"	 ".###...."
gfx_row   "........"	 ".##....."
gfx_row   "........"	 "........"
gfx_row   "........"	 "####...."

 

 

This technique is also used in worm womper, to make tons of worms for the player to shoot.

 

Catsfolly

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