Yars' Revenge 8-12-81

This is a mid level WIP for Yars' Revenge. The main gameplay is all there, but there are still some differences from the final version.

The first major change is with variations 6 & 7. In this prototype variations 6 and 7 feature an invisible shield around the Qotile which is only visible briefly when shot or touched. These variations also feature the bouncing Zorlon Cannon which can be a problem as you can't see the shield. It's unknown why these variations were changed for the final version, but they might have not been interesting or fun enough.

The second major change is that the easter egg is missing. HSW's initials are not present in this prototype! Also of note is that the black line for triggering the easter egg in the final version (the Ghost of Yar) is also missing.

Finally the copyright year says 1982 instead of 1981. This is actually correct as the game was released in May of 1982. It's unknown why this was changed to 1981 for the final version.

Differences

The copyright says 1982 instead of 1981

The joystick reading code is different. You move further when moving left or right, almost as if you're sliding a bit. This doesn't seem to affect the up and down movement.

The game variation selection text is light purple instead of blue

There is no status screen shown between levels. After destroying the Qotile you are immediately moved to the next level.

There is no black line (Ghost of Yar) when destroying the Qotile

The easter egg with HSW's initials is missing

Variations 6 and 7 are different. Instead of having to gather energy to create the Zorlon Cannon, these variations feature an invisible shield instead. The shield around the Qotile is invisible until it is touched or shot after which is will glow for a short time. These variations also feature the bouncing Zorlon Cannon.

They actually have the correct year in the prototype

Pink game select text

In variations 6 and 7 the shield is only visible briefly when hit

No 'Ghost of Yar' here

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