Andy McFadden 33ccdd91eb Fix lastOffset calculations in Apple II hi-res visualizer ...

The calculations were wrong for certain situations, generating
answers that were useless or that caused a false-positive overflow
error.

This adds a couple of simple regression tests, modeled after layout
of the Lode Runner sprite sheet (which worked fine before) and the
Empire II EWS3 font (which failed).

This also bumps up some of the arbitrary limits in the visualizer.

(issue #94)

2021-05-17 17:28:13 -07:00

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