←2021-01-12 2021-01-13 2021-01-14→ ↑2021 ↑all
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01:33:21 <zzo38> Does any programming language have a operator which works like addition, bitwise OR, or bitwise XOR, but with an undefined result if the operands share any bit positions set?
01:35:41 <kmc> not that i'm aware
01:36:36 <kmc> but there is the tristate logic of digital electronics, where 0+Z = 0+0 = 0, 1+Z = 1+1 = 1, and 0+1 = undefined
01:36:40 <kmc> and Z+Z = Z
01:37:34 <shachaf> zzo38: Well, most languages have three such operators, right?
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01:38:50 <zzo38> shachaf: Yes, but not an operator that does all three (although if none of the set bit positions are shared, those three operations are equivalent)
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01:40:45 <kmc> (and you can even define "weak" versions of 0 and 1 which override Z but can be overridden by the strong version of either bit)
01:41:53 <kmc> and weak 0 + weak 1 = undefined, but what about (weak 0 + weak 1) + strong 0?
01:42:01 <kmc> i think in the usual CMOS implementation of logic that would be a defined 0
01:42:10 <kmc> but that means that algebraically you need "weak undefined" too
01:43:13 <kmc> and obviously the weak/strong thing breaks down at some point
01:43:50 <kmc> if you have enough different pins driving the same net as "weak 0" then a strong 1 might get it only to undefined or even leave it reading 0
01:45:21 <kmc> the usual solution to that is the open-collector or open-drain bus, wherein you have a single device driving "weak 1" (a pull-up resistor) and the other devices are either strong 0 or Z
01:48:44 <zzo38> I have never seen cases of multiple weak driving the same net at once except in cases where they are all weak (and all the same way 0 or 1), unless I misremembered, or if I missed something. In what I have seen, it is like what you describe, only one weak, the others are strong or Z.
01:56:09 <kmc> I learned the other day that there are "active pull-up" chips like LTC4311 which will feed the bus with extra current while it's rising, and then shut off when it reaches the high voltage so it can be pulled down again
01:56:50 <kmc> thus allowing higher speeds for a given level of bus capacitance
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12:25:47 <esowiki> [[Special:Log/newusers]] create * Kirbyiseatinghumanmeat * New user account
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12:39:50 <esowiki> [[Esolang:Introduce yourself]] https://esolangs.org/w/index.php?diff=79956&oldid=79941 * Kirbyiseatinghumanmeat * (+130) The introduction of me, Kirbyiseatinghumanmeat! :)
12:42:38 <esowiki> [[User:Kirbyiseatinghumanmeat]] N https://esolangs.org/w/index.php?oldid=79957 * Kirbyiseatinghumanmeat * (+88) The website of my user!
12:43:43 <esowiki> [[User:Kirbyiseatinghumanmeat]] M https://esolangs.org/w/index.php?diff=79958&oldid=79957 * Kirbyiseatinghumanmeat * (+4) The website of my user! 2
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13:25:51 <esowiki> [[Arsel]] N https://esolangs.org/w/index.php?oldid=79959 * Kirbyiseatinghumanmeat * (+2405) Create the wiki for Arsel
13:27:05 <esowiki> [[Arsel]] M https://esolangs.org/w/index.php?diff=79960&oldid=79959 * Kirbyiseatinghumanmeat * (-8) /* The interpreter */
13:28:44 <esowiki> [[Arsel]] M https://esolangs.org/w/index.php?diff=79961&oldid=79960 * Kirbyiseatinghumanmeat * (+46) /* The interpreter */
13:29:44 <esowiki> [[Arsel]] M https://esolangs.org/w/index.php?diff=79962&oldid=79961 * Kirbyiseatinghumanmeat * (+16) Minor edit
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17:17:43 <esowiki> [[Length]] M https://esolangs.org/w/index.php?diff=79963&oldid=79955 * Nailuj29 * (+76)
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18:56:47 <esowiki> [[Arsel]] M https://esolangs.org/w/index.php?diff=79964&oldid=79962 * PythonshellDebugwindow * (+62) /* Instructions */ Convert to table
18:58:28 <esowiki> [[Arsel]] M https://esolangs.org/w/index.php?diff=79965&oldid=79964 * PythonshellDebugwindow * (+149) /* The interpreter */ Cats
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19:23:25 <esowiki> [[Language list]] M https://esolangs.org/w/index.php?diff=79966&oldid=79948 * PythonshellDebugwindow * (+12) /* A */ Add [[Arsel]]
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23:08:11 <zzo38> Is there any .NSF music player which will use two separate filter programs (operating using stdin/stdout), one which converts the NSF to the (infinite) register stream, and one which converts the register stream to the (also infinite) audio stream?
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←2021-01-12 2021-01-13 2021-01-14→ ↑2021 ↑all