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752d: Calculate new Jetman horizontal speed.
Used by the routine at 739e.
752d ld a,($5dca) Jetman speed modifier ($00 or $04)
7530 sub $08 A=$F8 or $FC
7532 add a,(ix+$05) A += Jetman X speed
7535 jp p,$73d1 Update horizontal speed if new speed is positive
7538 xor a
7539 jp $73d1 Update horizontal speed to zero
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