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using Manic Miner and Jet Set Willy game engines
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Message: 4389
Author: john_elliott_uk
Date: 17/08/2004
Subject: Re: JSWED 2.1.6 uploaded
--- In manicminerandjetsetwilly@yahoogroups.com, andrewbroad
> So when can we expect JSW64 to reach gamma-release status? It's
When It's Finished (tm). This basically involves working out why the
> becoming ever more important with several people now planning to
> write games based on these engines; JSW64 deserves its own category
> in my List of MM/JSW Games.
Kong Beast has stopped working in JSW64:MM.
> Can Skylabs also go either right or left, as in MirrorMM?
You'd have to poke the game engine, same as in MM.
> > Triggers are the important one. You put a trigger before another
In JSW64, there are no guardian classes; each room contains its own
> > guardian. It will watch a byte; when that byte goes to zero, the
> > trigger is activated. It pokes five bytes into the following
> > guardian (byte 0 and bytes 4-7), and then disables itself.
>
> I presume "guardian" here means "guardian-instance" rather
> than "guardian-class".
instance list in expanded form. That's what makes it possible for most
of these extra guardian types to work; I considered backporting them
to JSW128 (which is quite feasible technically) but some of them would
be awkward to manage in a class+instance system.
> So is the byte to be watched specified as a 16-bit address?
Yes.
> So are items represented in such a way that a whole byte goes to
goes
> zero when they are collected, and switches so that a whole byte
> to zero when they are turned?
Exactly. In the case of the items, JSW64 sets a byte to zero at the
start of a game cycle, and increments it when each item is drawn, the
same as MM does for its portal check. Similarly the switch guardian's
'vertical speed' is 1 if the switch is off, 0 if it's on.
> What's a WIP?
Work in Progress.
> I've always found one-way switches annoying. It would be cool if
you
> could turn back the switch in a Kong-Beast room so that the wall
Closing walls would have to be done with patch vectors.
> closes up again.
> So to make a gap of n character-columns, you'd have to have n
Yes. Either all triggered by the same switch, or each one triggered
> opening walls?
by the previous one.
> Can it work in reverse (making a moving guardian freeze or vanish),
Yes; use a trigger to turn a blank guardian into a stopper - or into
> as I seem to remember seeing in Erix1 Mode?
a live guardian.
> Who's Oscar?
Oscar Wilde.
Oscar Wilde: "I wish I had said that."
Whistler: "You will, Oscar; you will."
> So if we invented a special dimension of guardian-types that were
and
> drawn BEFORE the player, they would not collide with the player,
> would behave according to the attribute-definitions of the block-
Collisions need not be fatal, of course. The switch-drawing code
> types.
uses pretty much the same sprite-drawing code as usual, but if the
call to DRWFIX returns with the Z flag not set, the switch toggles
rather than Willy dying. For reasons of space, it's actually done
using self-modifying code; I poke a RET into the normal sprite-drawing
code, call it, and poke the RET out again.
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