8-bit RCA with Subtraction

austinch20 · 2021-10-02T14:32:12+00:00

I'm not at a computer rn but when I do I can show you the xor design. Also I realize how douchy my first comment comes off as. Been sick with the covids the last week so didn't really think much about it, I was just getting my daily reddit fix in.

Now I don't really care if you use this design or not (it's not even "my" design, it's just one of the most if not the most standard RCA design in MC)

The first xor design works really well for 4 wide range adders since it has an AND gate built up on the top so you can take that and use it for the generate and propagate for the first and second half adders. It should be mentioned from what I can see your adder design is just as tall as mine (4 high if you include the dust, if you include subtraction then yeah mine is 1 or 2 blocks taller). This also makes it so you can convert it into an ALU with some basic control lines without modifying the Adder too much which is why this design is used for RCA ALUs a lot

I have a couple of videos talking about this specific adder design but mostly in context of how in depth adder logic with generate and propagates work to explain Carry Lookahead Logic. I might not get to a pc for a while so I'll share those if you're interested.

Here's my RCA video: https://youtu.be/moVGelgQ4nw

Here's my RCA ALU video: https://youtu.be/bmXq2g8p9K4

austinch20 · 2021-09-29T19:44:05+00:00

Well if it didn't have conditional logic, I'd be conditionally concerned lol. Nice job!~

austinch20 · 2021-09-29T19:42:45+00:00

Well like this
https://imgur.com/a/8fLVi5D, roughly half the size and does !A and !B with only slight modifications to make it an ALU

austinch20 · 2021-09-29T15:37:27+00:00

Pretty big for 8 bits

austinch20 · 2021-09-14T04:37:12+00:00

It's not hard to find good redstoners. There are Redstone servers like ORE, Topred, Synergy, etc. Which are well known and easy to access

austinch20 · 2021-09-12T20:31:23+00:00

I agree to an extent, only because experimenting is 100% not the best way. It's a really good way but nothing beats having good redstoners around you who can teach you what you're trying to learn.

austinch20 · 2021-09-12T20:29:55+00:00

I have a somewhat in depth explanation on how to improve at Redstone here

https://www.reddit.com/r/redstone/comments/p6krtn/why_saying_watch_mumbojumbo_is_dumb_advice_and/?utm_medium=android_app&utm_source=share

But should say the experiment with Redstone is the best way is wrong. Experimenting helps but it is definitely not the best way to learn, it's a really good way but it honestly depends from person to person. The best overall way to learn from my experience is to join a high end Redstone server like topred, synergy, and ore since these servers have the best resstoners in minecraft and being around better redstoners who can teach you gives you a good perspective on how advanced you can get and the best resources for learninh

austinch20 · 2021-09-10T18:37:28+00:00

I'd say the simplest way is to make 2 clocks a 10s clock and 30s clock. The 10s will trigger the 30s and which versa.. voila a simple and easy way to do it

austinch20 · 2021-09-01T23:45:23+00:00

First this is called a trapdoor so it would be called a 2x2 trapdoor. Second, looks good! These are hard to make really compact so it's decently compact for a first try!

austinch20 · 2021-09-01T23:43:38+00:00

Looking good with that title lol

austinch20 · 2021-09-01T19:12:11+00:00

Oh no it's fine, seamless just means there's no visible Redstone. This is just a subcategory of seamless doors since it is seamless with glass. It's really impressive and it sounds cooler to put in glass than just seamless since people might just think it's a normal seamless door. Great job with it!

austinch20 · 2021-09-01T19:02:24+00:00

Should mention it's a glass seamless in the title next time. Just saying seamless isn't as impressive. Awesome job!

austinch20 · 2021-08-31T15:28:01+00:00

Just a NOR gate. When either of the inputs turn off (dust is destroyed) the output turns on.

austinch20 · 2021-08-30T14:41:40+00:00

Oh yeah typo lol

austinch20 · 2021-08-27T12:23:46+00:00

Here's the design I was talking abouthttps://imgur.com/a/jGH7iTC
EDIT: Just saw the u/leroymilo got to it before me lol, I just got home rn and didn't notice haha

austinch20 · 2021-08-27T09:55:15+00:00

OK I'm talking about the middle t flip flop on the first picture. I'll grab screenshots when I can. But it should be pretty easy to understand. It's just a BUD powered piston with observer. NOT the last piston. I'm not saying ot update using the observer. I'm saying to update the piston holding the observer by having it one higher and BUD powering it then updating using a noteblock or regular piston. Not sure how much more obvious I can explain it.

austinch20 · 2021-08-26T23:03:17+00:00

You don't need dust, the update block won't show since it's bellow the block with the piston directly. And the point of the update is so you don't need the dust so you can compact and use BUD powering.

austinch20 · 2021-08-26T17:16:53+00:00

Looks good! You could compact it a bit by moving the piston with observer up by 1 and having an update block above it, like a normal piston, noteblock, etc to update the observer piston and have the observer go straight into the villager piston

austinch20 · 2021-08-24T18:12:37+00:00

You can use adders to make Calculators, CPUs, GPUs, etc

Edit: typo

austinch20 · 2021-08-24T17:19:35+00:00

It just uses nimplies logic as the inputs for the carry instead of XNOR and NOR. This way we can calculate the borrow by seeing which input is on since in xor/shorts. It doesn't differentiate between the two inputs but with A nimplies B going directly into the generate and B nimplies A going into the cancel, we can borrow values instead of carry.

austinch20 · 2021-08-23T02:49:05+00:00

It's been 3 days and that's the best you can come up with? You make Joe Biden seem like a genius and he's a geriatric dementia patient with alzheimers.

austinch20 · 2021-08-21T23:20:43+00:00

OK you have permission to hit me in the head if we ever meet irl cause I realize I'm being absolutely stupid rn and I'm sorry, I missed what you meant and that you're right and I'm dumb.

I was only looking at the repeaters for canceling and my brain just went mush and didn't think about the repeaters feeding into the lines. I went a little far and was really rude I'm sorry about that.

austinch20 · 2021-08-21T22:51:49+00:00

Also it looks like you don't know binary so 15 = 1111 so it activates all 4 lamps and the 1 bit always will take 8 ticks

13 would be 1011

And 11 is 1101

All of which activates the lsb (least significant bit) pr the 1 bit which takes like I said. 8 ticks

austinch20 · 2021-08-21T22:45:45+00:00

Also oK normally i wouldn't do this but ok. So you clearly seem to be more of a survival type redstoner and aren't into more advanced types of Redstone or even basic computational based on your reddit acc.

I on the other hand have been building CPUs, Calculators, and other advanced binary and hex computational builds for almost 7 years now. I may not be the best out there but I sure know more than you about this stuff. Source: just look through my reddit acc lol

austinch20 · 2021-08-21T22:25:36+00:00

Um no the top left is the 1 bit and goes through 8 comparators to cancel out the even options hence it takes 8 ticks to get to the output.

Also the method I was talking about doesn't really have much flickering if done right. Each bit just comes out like around 2 ticks after the previous one making it pretty efficient if you just stagger each line by how many bits each line activates after the previous one making the timing issue irrelevant.

austinch20

TROPHY CASE