Saturday, 7 April 2018

RetroChallenge 2018/04: MC-Chase the Continuing Evolution

I've added two maps to the game. You get a new map every 3 completions of a map. The third map contains a "secret message." The maps are saved as DATA statement lines. Since the speedup routine by James Diffendaffer also uses DATA statements, I had to create a routine to restart at the first map DATA statement after you lose your last man. Pippa's POKE/PEEK routine for doing a RESTORE to a specific POINT in the DATA statements was helpful in accomplishing this:


Her routine effectively provides the same ability that other Basics have of including a specific line number with the RESTORE command to have data reading begin at that line. In fact, it is even more flexible because it allows you to choose which specific data item to restore READing to once you repoke the saved value (in the example above OD is used to restore the memory address located by the PEEKs done at line 8).

My plan is to convert the game to Coco after I've got all the bugs out. I'll then release both versions during Cocofest. I won't need Pippa's routine for the Coco version because I won't be using Diffendaffer's speedup M/L routine. Instead, I'll include a routine giving the option to use the standard Coco 2 or 3 (or Dragon) high speed POKES.

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