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using Manic Miner and Jet Set Willy game engines
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Message: 4399
Author: john_elliott_uk
Date: 20/08/2004
Subject: Re: Patch Vectors
--- In manicminerandjetsetwilly@yahoogroups.com, I wrote:
> vector: ld hl,tick ;HL = address of the tick count.- Though in JSW64, that only reverses the conveyor animation. To
> inc (hl) ;Add 1 to the count.
> ld a,(hl) ;Get its new value
> cp 26 ;Or however many ticks you want
> ret c ;If A is less than 26, return.
> ld (hl),0 ;Reset the counter to 0.
> ld hl,80D6h ;HL = address of the conveyor direction
> ld a,(hl) ;A = current conveyor flag
> xor 1 ;If A was 1, it becomes 0, and vice versa.
> ld (hl),a
> ret
reverse the conveyor direction, you have to do the same trick to the
correct entry in the element map at 8D33h. Say your conveyor is cell 5
- the entry to reverse is at 8D33h + 2*5 + 1 = 8D3Eh.
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