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latch truth table, timing and wire tunnel info, section restructuring, wording
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'''Wire''' is a mechanic introduced in [[Chip's Challenge 2]]. It's technically not a [[tile]], but instead enables [[floor]] and [[steel wall]]s to carry a signal between various game elements. Pink buttons, black buttons, and logic gates are capable of outputting a signal, and many more tiles can take signal as input. Wires will also be activated if | '''Wire''' is a mechanic introduced in [[Chip's Challenge 2]]. It's technically not a [[tile]], but instead enables [[floor]] and [[steel wall]]s to carry a signal between various game elements. Pink buttons, black buttons, and logic gates are capable of outputting a signal, and many more tiles can take signal as input. Wires will also be activated if a movable object steps on it while equipped with the [[lightning bolt]]. Wire tunnels can send current across the map. | ||
[[Teleport|Blue teleport]]s can be connected together with wire. If a movable object enters such a teleport network, it must exit a teleport in the same network. | [[Teleport|Blue teleport]]s can be connected together with wire. If a movable object enters such a teleport network, it must exit a teleport in the same network. All unwired blue teleports function together as one network, although due to a glitch, it is possible for an unwired teleport to send objects to a wired teleport. Logic gates can act as one-ways on a network. Signal only affects whether logic gates function as one-ways or as gaps in the wire. | ||
The [[lightning bolt]], when equipped by a moving object, will supply signal to a wire while stopped on one. The lightning bolt has no effect on wires that are already activated. | The [[lightning bolt]], when equipped by a moving object, will supply signal to a wire while the object is stopped on one. The lightning bolt has no effect on wires that are already activated. | ||
== Tiles | == Wire Tunnels == | ||
A value of ''pulse'' in the ''toggle type'' column indicates that the tile only needs one frame of signal to toggle, while ''steady'' indicates that the tile will be toggled only when the signal is active. | {{Infobox Tile | ||
|name = Wire tunnel | |||
|image cc2 = [[Image:WireTunnel1.png]] [[Image:WireTunnel2.png]] [[Image:WireTunnel3.png]] | |||
|cc2 = Yes | |||
|multidirectional = Yes | |||
|moves = No | |||
}} | |||
'''Wire tunnels''' are wire modifiers that allow current going into them to jump across any number of tiles. Wire tunnels work in pairs: for two tunnels to connect to each other, they must face each other and be in the same row or column, depending on whether they are horizontal or vertical, respectively. Multiple wire tunnel pairs on the same row or column work like parentheses: innermost pairs always connect, then the next innermost pairs, and so on. If a wire tunnel cannot find another to pair with on its row or column, it remains unpaired. | |||
It is possible to remove the wire from the wire tunnel, as shown in the picture on the right. These tunnels behave as one would expect; they connect to other tunnels (wired or not) in the same way, and effectively end the wire on the other side if there is one. Consequently, these are not particularly useful in level design. | |||
== Tiles That Accept Signal Input == | |||
A value of ''pulse'' in the ''toggle type'' column indicates that the tile only needs one frame of signal to toggle (i.e. only changes state when signal changes from OFF to ON), while ''steady'' indicates that the tile will be toggled only when the signal is active (i.e. changes state on both off-to-on and on-to-off transitions). | |||
{| class="wikitable" | {| class="wikitable" | ||
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== Buttons and Switches == | == Buttons and Switches == | ||
=== Pink button === | === Pink button === | ||
{{Infobox Tile | {{Infobox Tile | ||
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}} | }} | ||
The '''pink button''' is a button introduced in Chip's Challenge 2. While held by | The '''pink button''' is a button introduced in Chip's Challenge 2. While held by a movable object, it activates any [[wire]] it is connected to. | ||
Pink buttons do not relay currents, unlike black buttons and [[blue teleport]]s. | Pink buttons do not relay currents, unlike black buttons and [[blue teleport]]s. | ||
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{{clear}} | {{clear}} | ||
=== Black button=== | === Black button === | ||
{{Infobox Tile | {{Infobox Tile | ||
|name = Black button | |name = Black button | ||
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}} | }} | ||
The '''black button''' is a button introduced in Chip's Challenge 2. It has the opposite behavior of a [[pink button]]: it activates any [[wire]] it is connected to ''except'' while held by | The '''black button''' is a button introduced in Chip's Challenge 2. It has the opposite behavior of a [[pink button]]: it activates any [[wire]] it is connected to ''except'' while held by a movable object. | ||
If a black button receives a current from any side, it will relay that current to the side opposite of that from which it is received. | If a black button receives a current from any side, it will relay that current to the side opposite of that from which it is received. | ||
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{{Infobox Tile | {{Infobox Tile | ||
|name = Switch | |name = Switch | ||
|image cc2 = [[Image:OnSwitch.png]][[Image:OffSwitch.png]] | |image cc2 = [[Image:OnSwitch.png]] [[Image:OffSwitch.png]] | ||
|cc2 = Yes | |cc2 = Yes | ||
|multidirectional = No | |multidirectional = No | ||
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}} | }} | ||
The '''switch''' is a special tile in [[Chip's Challenge 2]]. When set to the ''on'' position, a current will be output through wire that is connected to the switch. When set to the ''off'' position, no current will be output. Switches can be toggled by | The '''switch''' is a special tile in [[Chip's Challenge 2]]. When set to the ''on'' position, a current will be output through wire that is connected to the switch. When set to the ''off'' position, no current will be output. Switches can be toggled by any movable object. | ||
{{clear}} | {{clear}} | ||
== Logic Gates == | == Gates == | ||
Gates are tiles that use existing signals to create new signals. They otherwise [[acting floor|behave like floor]], except that [[ice block]]s cannot melt on them, even though they cannot be destroyed by [[time bomb]]s (and therefore cannot be replaced by [[fire]] if a monster is on it). The lightning bolt has no effect on these tiles. | |||
=== Logic Gates === | |||
{{Infobox Tile | {{Infobox Tile | ||
|name = Logic gate | |name = Logic gate | ||
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}} | }} | ||
'''Logic gates''' perform a logical operation on one or two wire inputs and produce a single output. They consist of the inverter, AND gate, OR gate, NAND gate, and XOR gate. There also exist NOR and XNOR | '''Logic gates''' perform a logical operation on one or two wire inputs and produce a single output. They consist of the inverter, AND gate, OR gate, NAND gate, and XOR gate. There also exist diodes, NOR gates, and XNOR gates, but these are not present in Chip's Challenge 2. | ||
=== Inverter === | Note that often times the term "logic gate" is used to refer to any gate, including latches and counters (see below). | ||
==== Inverter ==== | |||
[[File:NOTgate.png|left]] | [[File:NOTgate.png|left]] | ||
The '''inverter''', also called the '''NOT gate''', accepts a single input and inverts the signal. If its input signal is ON, the output signal will be OFF. If its input signal is OFF, the output signal will be ON. | The '''inverter''', also called the '''NOT gate''', accepts a single input and inverts the signal. If its input signal is ON, the output signal will be OFF. If its input signal is OFF, the output signal will be ON. | ||
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|} | |} | ||
=== AND gate === | ==== AND gate ==== | ||
[[File:ANDgate.png|left]] | [[File:ANDgate.png|left]] | ||
The '''AND gate''' accepts two inputs. If both inputs signals are ON, the output signal will be ON. Otherwise, the output signal will be OFF. | The '''AND gate''' accepts two inputs. If both inputs signals are ON, the output signal will be ON. Otherwise, the output signal will be OFF. | ||
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|} | |} | ||
=== OR gate === | ==== OR gate ==== | ||
[[File:ORgate.png|left]] | [[File:ORgate.png|left]] | ||
The '''OR gate''' accepts two inputs. If at least one of the input signals are ON, the output signal will be ON. Otherwise, the output signal will be OFF. | The '''OR gate''' accepts two inputs. If at least one of the input signals are ON, the output signal will be ON. Otherwise, the output signal will be OFF. | ||
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|} | |} | ||
=== NAND gate === | ==== NAND gate ==== | ||
[[File:NANDgate.png|left]] | [[File:NANDgate.png|left]] | ||
The '''NAND gate''' accepts two inputs. It is equivalent to an AND gate immediately followed by an inverter. If both input signals are ON, the output signal will be OFF. Otherwise, the output signal will be | The '''NAND gate''' accepts two inputs. It is generally equivalent to an AND gate immediately followed by an inverter. If both input signals are ON, the output signal will be OFF. Otherwise, the output signal will be ON. | ||
{| class="wikitable" | {| class="wikitable" | ||
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|} | |} | ||
=== XOR gate === | ==== XOR gate ==== | ||
[[File:XORgate.png|left]] | [[File:XORgate.png|left]] | ||
The '''XOR gate''' gate accepts two inputs and performs an ''exclusive or'' operation. If one or the other of the two input signals is ON, the output signal will be ON. If neither input signals are ON or both input signals are ON, the output signal will be OFF. | The '''XOR gate''' gate accepts two inputs and performs an ''exclusive or'' operation. If one or the other of the two input signals is ON, the output signal will be ON. If neither input signals are ON or both input signals are ON, the output signal will be OFF. | ||
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|} | |} | ||
== Other | === Other Gates === | ||
=== Counter === | |||
==== Counter ==== | |||
{{Infobox Tile | {{Infobox Tile | ||
|name = Counter | |name = Counter | ||
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}} | }} | ||
The '''counter''' is a gate with two inputs and two outputs. A pulse that enters the counter from right side will increment it by one and from the bottom side will decrement it by one. If the counter is incremented while at 9, it will ''overflow'', output a pulse to the left side, and wrap to 0. If the counter is decremented while at 0, it will ''underflow'', output a steady signal to the top side, and wrap to 9. | The '''counter''' is a gate with two inputs and two outputs. A pulse that enters the counter from the right side will increment it by one and from the bottom side will decrement it by one. If the counter is incremented while at 9, it will ''overflow'', output a pulse to the left side, and wrap to 0. If the counter is decremented while at 0, it will ''underflow'', output a steady signal to the top side, and wrap to 9. This steady signal remains until the counter receives another pulse from either input. | ||
=== Latch === | {{clear}} | ||
==== Latch ==== | |||
{{Infobox Tile | {{Infobox Tile | ||
|name = Latch | |name = Latch | ||
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}} | }} | ||
The '''latch gate''' has two inputs and one output. The arrow points from the data input to the output, and the input on the opposite side is the latch input. As long as the latch input has a signal, the output will be the same as the data input. When the latch input has no signal, the output will stay the same as it was when the latch input last had a signal. Latch gates can be thought of as storage for one bit of memory. | The '''latch gate''' has two inputs and one output. The arrow points from the '''data''' input to the output, and the input on the opposite side is the '''latch''' input. As long as the latch input has a signal, the output will be the same as the data input. When the latch input has no signal, the output will stay the same as it was when the latch input last had a signal. Latch gates can be thought of as storage for one bit of memory. Wikipedia calls this gate a D gated latch or D flip-flop.<ref>https://en.wikipedia.org/wiki/Flip-flop_(electronics)</ref> <!--At least, that's what this seems to most closely resemble. Correct this if it's wrong.--> | ||
{| class="wikitable" | |||
|- style="background:#def; text-align:center;" | |||
|colspan=3|'''INPUT''' || '''OUTPUT''' | |||
|- style="background:#def; text-align:center;" | |||
| Latch || Data || Output (previous frame) || Output (current frame) | |||
|- style="background:#dfd; text-align:center;" | |||
|0 || 0 || 0 || 0 | |||
|- style="background:#dfd; text-align:center;" | |||
|0 || 0 || 1 || 1 | |||
|- style="background:#dfd; text-align:center;" | |||
|0 || 1 || 0 || 0 | |||
|- style="background:#dfd; text-align:center;" | |||
|0 || 1 || 1 || 1 | |||
|- style="background:#dfd; text-align:center;" | |||
|1 || 0 || 0 || 0 | |||
|- style="background:#dfd; text-align:center;" | |||
|1 || 0 || 1 || 0 | |||
|- style="background:#dfd; text-align:center;" | |||
|1 || 1 || 0 || 1 | |||
|- style="background:#dfd; text-align:center;" | |||
|1 || 1 || 1 || 1 | |||
|} | |||
Note that "previous output" in this table is internal, and not necessarily the state of the wire connected to the gate's output. | |||
The second latch pictured to the right is a mirror image of the first latch, used to keep the game elements symmetrical. | The second latch pictured to the right is a mirror image of the first latch, used to keep the game elements symmetrical. | ||
=== Timing and Loops === | |||
At the start of a level, all inputs and outputs are OFF. On every frame after the first, all gates produce output based on their inputs from the ''previous'' frame. Because of this, each gate is considered to have a 1-frame "delay". For example, an AND gate followed by a NOT gate have a combined 2-frame delay, whereas a NAND gate only has a 1-frame delay, and therefore is not exactly equivalent even though the logic is the same. As another example, a chain of OR gates of length N will have an N-frame delay. This can be used to precisely control the timing and activation of various objects and parts of circuits. | |||
This also leads to interesting behavior when logic gates feed into themselves or each other. For example, an OR gate with its output wired to one of its inputs, once triggered, will output ON permanently, and an inverter wired to itself will toggle its output every frame. | |||
In [[Crazy II]], there is a loop consisting of one inverter and two OR gates, which has a 6-frame (0.1-second) cycle: each wire segment is ON for 3 frames, then OFF for 3 frames. This feeds into a counter gate, causing it to output a pulse every 60 frames, or once per second. This in turn feeds into several more counter chains. As a consequence, each of these chains functions as a clock counting down in real time. | |||
== References == | |||