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Zarch AcornGamez Video Archive
The late 80s shooter Zarch. This one really showed off the new Archimedes at the time.
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The video chip, its bus, the graphic mode (chunky for the Arc, bitplane for the Amiga), the 'colour line drawing' the Amiga could use with its copper, something which doesn't exist on the Archimedes, all this must be considered.
On an ARM2 machine a 4 channel MOD player uses from 12 to 15% of the available cycles per VBL in a 320*256, 256 colour screen mode. (BTW the Archimedes had 8 channels).
I think it's less on the Amiga.
"You are the pilot of the Zarch hoverplane; your orders are to defend the country against the waves of attacking alien spaceships. The alient race are intent on polluting the landscape by spraying it with a debilitating red virus."
(The typo 'alient' is in the manual. Maybe the writers got infected, too. Or is there such a word, alient?)
I'd put it this way: "In each attack wave, save as much of the area still uninfected as you can."