# Builder Application - J2ko

**URL:** <https://discourse.openredstone.org/t/builder-application-j2ko/1424>\
**Category:** Accepted\
**Created:** [November 24, 2021, 11:00pm UTC](https://discourse.openredstone.org/t/builder-application-j2ko/1424 "2021-11-24T23:00:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![j2ko](https://discourse.openredstone.org/user_avatar/discourse.openredstone.org/j2ko/32/1484_2.png) [@j2ko](https://discourse.openredstone.org/u/j2ko)\
**Post date:** [November 24, 2021, 11:00pm UTC](https://discourse.openredstone.org/t/builder-application-j2ko/1424/1 "2021-11-24T23:00:19Z")

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**Minecraft name:**  
J2ko

**What do you like the most about redstone?:**  
Creating a redstone build is always a unique and fun challenge! I enjoy the process of building creations using problem solving and creative thinking.

**What’s a thing you have made which demonstrates redstone knowledge?:**  
While I have years of experience building compact contraptions, I am brand new to computational redstone. I designed two 4 bit RCA based ALUs; one is 2 wide and horizontally expandable while the other is 2 high and vertically expandable.

**What does the thing do?:**  
Both of these ALUs can add, subtract, and perform AND, NAND, OR, NOR, XOR, and XNOR comparisons on a pair of four bit inputs.

**Image(s) and/or video(s) of the device:**  
[2 wide 4 bit horizontal ALU](https://media.discordapp.net/attachments/436705021145382924/913199153646034954/2021-11-24_16.42.06.png?width=1191&height=670)  
[2 high 4 bit vertical ALU](https://media.discordapp.net/attachments/436705021145382924/913199154749112390/2021-11-24_16.42.34.png?width=1191&height=670)

**What do you plan on making for your build trial?:**  
I plan to build a simple 4 bit ALU.

**Do you agree with the rules?:**  
Absolutely!

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**Author:** ![Amelium](https://discourse.openredstone.org/user_avatar/discourse.openredstone.org/amelium/32/8371_2.png) [@Amelium](https://discourse.openredstone.org/u/Amelium)\
**Post date:** [November 24, 2021, 11:14pm UTC](https://discourse.openredstone.org/t/builder-application-j2ko/1424/2 "2021-11-24T23:14:23Z")

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**This application has been accepted!** Whenever both you and a staff member are free, feel free to ask them for a trial. You are able to try again after failing and waiting 24 hours. It is always recommended to do a practice trial with another member before starting your real one.

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**Author:** ![system](https://discourse.openredstone.org/uploads/default/original/1X/3751cb7164d949629ccd5dd712d1e65996e22e97.png) [@system](https://discourse.openredstone.org/u/system)\
**Post date:** [August 23, 2026, 6:52pm UTC](https://discourse.openredstone.org/t/builder-application-j2ko/1424/3 "2026-08-23T18:52:53Z")

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Closed on August 23, 2026, 6:52pm UTC