Resource centre for ZX Spectrum games
using Manic Miner and Jet Set Willy game engines
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Message: 6970
Author: rushforthian
Date: 10/12/2016
Subject: Re: Advanced Trainer - Daniel's suggestions
I said:
> [The top pixel-row of a Crumbly cell in character-row 0 or 1] is only cleared whilst Willy is standing on it;
More accurately, the top pixel-row of the Crumbly cell upon which Willy is standing, is overwritten [temporarily; for as long as Willy is standing on it] by the colour-attribute byte of the current cavern's Air cells.
Of course, that equates to the graphic byte being cleared iff the Air cells have a colour-attribute value of 00 (Black INK on Black PAPER, non-Bright and non-Flashing). Which is the case for most caverns, but not all!
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