Logic - Revision history

Hazzard: /* Advanced logic elements */

2019-08-27T21:16:02Z

‎Advanced logic elements

Hazzard: /* Advanced logic elements */

2019-08-27T21:14:13Z

‎Advanced logic elements

Hazzard: /* Advanced logic elements */

2019-08-27T21:08:53Z

‎Advanced logic elements

Hazzard: /* Advanced logic elements */

2019-08-27T21:08:33Z

‎Advanced logic elements

Hazzard at 20:33, 27 August 2019

2019-08-27T20:33:31Z

Hazzard: /* Advanced logic elements */

2019-08-27T20:30:20Z

‎Advanced logic elements

Mfb: exchanged signal link

2013-05-09T15:33:01Z

exchanged signal link

Mfb: +category

2012-12-09T16:13:04Z

+category

Mfb: moved User:Mfb/Logic to Logic: that can be released

2012-12-05T18:25:36Z

moved User:Mfb/Logic to Logic: that can be released

Mfb: /* Applications */ possible extensions hidden as comment

2012-12-05T18:25:11Z

‎Applications: possible extensions hidden as comment

@@ Line 34: / Line 34: @@
 [[File:Logic traincounter.png|thumb|220px|left|A simple train counter. It can fail if the line jams. The counter train (lower left part) is released if the TL2-train blocks the NOT gate entry, but not the signal block behind and in front of it.]]
 [[File:Logic_delay.png|thumb|220px|right|A delay circuit. When the input (top right) turns green, after the train traverses the loop the output (bottom left) will flash green. The delay depends on the speed of the train.]]
-[[File:Logic_abs_red_converter.png|thumb|220px|left|A green to absolute red converter (red PURR). The dummy train on the right alternates moves left or right depending on the input, creating the absolute red. Used to make an absolute red based OR gate with the yellow line.]]
+[[File:Logic_abs_red_converter.png|thumb|220px|left|A green to absolute red converter (red PURR). The dummy train on the right alternates moves left or right depending on the input (bottom left), creating the absolute red output (bottom right). Used to make an absolute red based OR gate with the yellow line.]]
 === XOR ===
 XOR gates are red if exactly one of its two inputs is red. There is no known elementary gate for this, but it can be built as combination of multiple gates: (A XOR B) = (A OR B) AND (NOT(A AND B)) where A and B are the inputs.

@@ Line 34: / Line 34: @@
 [[File:Logic traincounter.png|thumb|220px|left|A simple train counter. It can fail if the line jams. The counter train (lower left part) is released if the TL2-train blocks the NOT gate entry, but not the signal block behind and in front of it.]]
 [[File:Logic_delay.png|thumb|220px|right|A delay circuit. When the input (top right) turns green, after the train traverses the loop the output (bottom left) will flash green. The delay depends on the speed of the train.]]
 === XOR ===
 XOR gates are red if exactly one of its two inputs is red. There is no known elementary gate for this, but it can be built as combination of multiple gates: (A XOR B) = (A OR B) AND (NOT(A AND B)) where A and B are the inputs.

@@ Line 33: / Line 33: @@
 [[File:Edge_detector_falling_inverted.png|thumb|220px|right|Falling edge detector (inverted). Output (right) flashes green when input (left) changes from red to green.]]
 [[File:Logic traincounter.png|thumb|220px|left|A simple train counter. It can fail if the line jams. The counter train (lower left part) is released if the TL2-train blocks the NOT gate entry, but not the signal block behind and in front of it.]]
-[[File:Logic traincounter.png|thumb|220px|right|A delay circuit. When the input (top right) turns green, after the train traverses the loop the output (bottom left) will flash green. The delay depends on the speed of the train.]]
+[[File:Logic_delay.png|thumb|220px|right|A delay circuit. When the input (top right) turns green, after the train traverses the loop the output (bottom left) will flash green. The delay depends on the speed of the train.]]
 === XOR ===
 XOR gates are red if exactly one of its two inputs is red. There is no known elementary gate for this, but it can be built as combination of multiple gates: (A XOR B) = (A OR B) AND (NOT(A AND B)) where A and B are the inputs.

@@ Line 30: / Line 30: @@
 == Advanced logic elements ==
-[[File:XOR.png|thumb|220px|right|XOR construction, you can see the OR and NOT gate inside]]
+[[File:XOR.png|thumb|220px|left|XOR construction, you can see the OR and NOT gate inside]]
 === XOR ===
 XOR gates are red if exactly one of its two inputs is red. There is no known elementary gate for this, but it can be built as combination of multiple gates: (A XOR B) = (A OR B) AND (NOT(A AND B)) where A and B are the inputs.
 === Edge detector ===
 An edge detector is sensitive to ''changes'' of its input: If the input switches from red to green (or green to red, depending on the implementation), its output becomes green (or red) for some time, and switches back to its original position afterwards. This can be used to detect trains running on a line.
 === Basic train counter ===
 A train, running in a loop, can be used as counter: Most of the time, all signals for this train are red. To count up, all signals get green for a short time, and the train travels to the next signal. This can be used to store data, for example in [[Self-regulating Network|self-regulating networks]].

@@ Line 30: / Line 30: @@
 == Advanced logic elements ==
-[[File:XOR.png|thumb|200px|right|XOR construction, you can see the OR and NOT gate inside]]
+[[File:XOR.png|thumb|220px|right|XOR construction, you can see the OR and NOT gate inside]]
 === XOR ===
 XOR gates are red if exactly one of its two inputs is red. There is no known elementary gate for this, but it can be built as combination of multiple gates: (A XOR B) = (A OR B) AND (NOT(A AND B)) where A and B are the inputs.
 === Edge detector ===
 An edge detector is sensitive to ''changes'' of its input: If the input switches from red to green (or green to red, depending on the implementation), its output becomes green (or red) for some time, and switches back to its original position afterwards. This can be used to detect trains running on a line.
-[[File:Logic traincounter.png|thumb|200px|right|A simple train counter. It can fail if the line jams. The counter train (lower left part) is released if the TL2-train blocks the NOT gate entry, but not the signal block behind and in front of it.]]
+[[File:Logic traincounter.png|thumb|220px|right|A simple train counter. It can fail if the line jams. The counter train (lower left part) is released if the TL2-train blocks the NOT gate entry, but not the signal block behind and in front of it.]]
 === Basic train counter ===
 A train, running in a loop, can be used as counter: Most of the time, all signals for this train are red. To count up, all signals get green for a short time, and the train travels to the next signal. This can be used to store data, for example in [[Self-regulating Network|self-regulating networks]].

← Older revision		Revision as of 15:33, 9 May 2013
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−	OpenTTD allows to control trains with signals. The introduction of [[presignals]] allows to build more complex setups - the state of a signal (green/red) does not only depend on the following signal block, but also on other signals. For details, see the signal-article in the OpenTTD wiki [http://wiki.openttd.org/Signals].	+	OpenTTD allows to control trains with [[signals]]. The introduction of presignals allows to build more complex setups - the state of a signal (green/red) does not only depend on the following signal block, but also on other signals. For details, see the signal-article in the OpenTTD wiki [http://wiki.openttd.org/Signals].

	Presignals are frequently used to control trains in [[priorities]] and station entries. The combination with [[dummy train]]s, however, allows even more powerful constructions. Signals can be green or red, those states can be identified with 0 and 1, respectively (this is just a convention, it could be used the other way round as well). With trains and signals, it is possible to build all basic computer elements. In theory, it is possible to build a CPU in a game. You could even simulate OpenTTD ''in'' OpenTTD, if map size and computing power would not be a limit.		Presignals are frequently used to control trains in [[priorities]] and station entries. The combination with [[dummy train]]s, however, allows even more powerful constructions. Signals can be green or red, those states can be identified with 0 and 1, respectively (this is just a convention, it could be used the other way round as well). With trains and signals, it is possible to build all basic computer elements. In theory, it is possible to build a CPU in a game. You could even simulate OpenTTD ''in'' OpenTTD, if map size and computing power would not be a limit.

← Older revision		Revision as of 16:13, 9 December 2012
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	Things to check: [[PublicServer:Archive_-_Games_231_-_240#gameid_239\|PSG239]], [[PublicServer:Archive_-_Games_221_-_230#gameid_223\|PSG223]], [[PublicServer:Archive_-_Games_211_-_220#gameid_214\|PSG214]], [[SRNW]]		Things to check: [[PublicServer:Archive_-_Games_231_-_240#gameid_239\|PSG239]], [[PublicServer:Archive_-_Games_221_-_230#gameid_223\|PSG223]], [[PublicServer:Archive_-_Games_211_-_220#gameid_214\|PSG214]], [[SRNW]]
	-->		-->
		+
		+	[[Category:Advanced Networking]]

← Older revision	Revision as of 18:25, 5 December 2012
(No difference)

@@ Line 58: / Line 58: @@
 Stations in self-regulating networks are the most common application of logic. The trains themself cannot have a full load order, therefore it is required to control that with logic. Usually, this is done with dummy or feeder trains - they have a full load order, and SRNW trains are allowed to go into a station only if a feeder/dummy train is unloading there.
-There are many possible layouts for SRNW stations, [link to examples]
+There are many possible layouts for SRNW stations, some of them are collected in the [[Junctionary_-_Stations_-_Special_Cases|Junctionary]].
 === Flipflop-Split ===
 A flipflop is a small memory with two possible states. This allows splits where exactly 50% of the trains go to one side and 50% go to the other side: The flipflop stores the direction of the last train and directs the new train to the other side.
@@ Line 66: / Line 67: @@
 If trains are lost, their destination at a split can be unpredictable. With a red twoway signal, they can be forced to split in a specific direction.
-[[File:Logic forcedsplit.png|thumb|400px|right|A split for lost trains: If the SL (western exit) is free, the NOT gate switches the twoway signal on the ML to red.]]
+<!--
-−
-−
 === Advanced concepts ===
 *1 in 1 out (PSG239)
 *Bigger feeder SRNW station (PZ22, PSG199)
 *Self-regulating RV (PSG229)
 Things to check: [[PublicServer:Archive_-_Games_231_-_240#gameid_239|PSG239]], [[PublicServer:Archive_-_Games_221_-_230#gameid_223|PSG223]], [[PublicServer:Archive_-_Games_211_-_220#gameid_214|PSG214]], [[SRNW]]