Resource centre for ZX Spectrum games
using Manic Miner and Jet Set Willy game engines
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Message: 7085
Author: rushforthian
Date: 02/03/2017
Subject: Re: Mirror MM/JSW / MM - JSW Conversions
I noticed that the impossible triangle on the Title Screen of MirrorJSW (ylliW teS teJ) isn't quite right.
However, this can be fixed by rearranging the graphic bytes of the components of the triangle, as stored at #8431-#8450.
Specifically, by transposing each pair of eight bytes: swap #8431-#8438 with #8439-#8440, and swap #8441-#8448 with #8449-#8450.
Alternatively, you could insert a CPL command (or an INC A or DEC A would do the trick) immediately prior to the AND #01 at #8872 in the 'Draw the title screen' routine. However, that would involve quite a bit of code-shifting code in order to fit it in. (The nearest one-byte efficiency I can see which could facilitate that, is to replace the LD A, #01 at #88A3 with an INC A, which has the same effect on the A register in the context.)
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