Application for VastAbyss

- 3x3 Piston Door Even though this isn't very impressive at all, I still decided to put it on here. The door consists of a 3x3 grid where all the blocks except the center and the center-bottom are assigned a piston. These blocks work like any other door as they are pushed out when the door is closed and pulled in when it opens. The center and center-bottom blocks however work a little differently. The mechanism consists of an upwards-facing double piston extender along with a piston 1 block above and 2 blocks to the side facing towards the block directly above the double piston extender (I will be calling a block directly on top of a piston "1 block above it"). We will call the bottom piston in the double piston extender piston A, the top one piston B, and the one off to the side piston C. To open the door, first, piston B pulls the blocks 2 blocks above it down so it is directly on top of it, then piston C pulls that block off to the side allowing the double piston extender to grab the center block. To close the door, piston B pushes spits out the block above it allowing piston C to push the block it's currently holding in its place. Finally, piston A then activates and deactivates without spitting out the block above it (piston B). - Order-sensitive Button Combination Lock The combination lock consists primarily of two parts: the sequence detection, and the error detection/reset. The sequence detection consists of a chain of SR NOR Latches. The "reset" input sets the output of the SR NOR Latch to a 1 while the "set" input sets it to a 0. The subsequent SR NOR Latch can only be "set" if the output from the previous latch is a 0. This means that the chain of latches can only be set in ascending order. When the output of the last latch is set to a 0, the combination lock outputs a 1. To prevent the player from brute-forcing the lock via pressing each button one after the other and repeating, the system must detect when the player presses a wrong button and then reset the latches. To do this, the system uses AND gates which take the current latch's "set" input and the last latch's output as two inputs. If the player tries to set a latch to 0 by inputting a 1 when the output of the last latch is still 1, then the system will trigger a reset line which resets the first latch where the signal then propagates through-out the chain thus resetting the output of each latch back to 1. - 8-Bit ALU Like with any other binary ALU, for each digit inputs A and B are fed into an AND gate and an XOR gate. The output of the AND gate becomes the carry-out for that digit. The output of the XOR along with the carry-in from the previous digit is fed into a second XOR gate and second AND gate. The output of that XOR gate becomes the output for that digit. The output of that AND gate (like the first AND gate) becomes the carry-out for that digit and is fed into the second XOR gate (also like the first AND gate). For subtraction, input B for each digit is inverted and a 1 is fed into the carry-in for the first digit.