8-bit ALU
- 3 ticks
- 3192
- 19×12×14
Verified specs
Credits
- Builder
unnecessarymb- Contributors
FireTner
LouParmi
Auzifriend
FEARLESS_Z_
Aminotreal- Built
- December 9, 2025
- Uploaded by
embizone
File
- Name
8_bit_ALU.schem- Uploaded
- October 18, 2026
- Last edited
- October 31, 2026
- Downloads
- 2
- Conventions
- followed
Inputs and outputs
| Input | Bits | Power | Delay |
|---|---|---|---|
| A | 8 | hard | t = 0 |
| B | 8 | hard | −1t |
| sub | 1 | soft | — |
| or | 1 | hard | — |
| nadd nsub | 1 | soft | — |
| or nor | 1 | soft | — |
| nadd nsub | 1 | hard | — |
| Output | Bits | First change | Settles |
| 8 | 3t | 3t | |
| bit 0 | 3t | 3t | |
| bit 1 | 3t | 3t | |
| bit 2 | 3t | 3t | |
| bit 3 | 3t | 3t | |
| bit 4 | 3t | 3t | |
| bit 5 | 3t | 3t | |
| bit 6 | 3t | 3t | |
| bit 7 | 3t | 3t | |
| carry out | 1 | 4t | 4t |
Block distribution
- Solid
- 475
- Dust
- 446
- Transparent
- 165
- Comparator
- 97
- Target
- 73
- Repeater
- 50
- Torch
- 34
- Barrel
- 27
- Lever
- 21
Description
3t ALU with 4t forward.
Can run the ALU in always negated mode for the 1 tick forward.
2026-01-11 rewired for nicer controls.
Special thanks to
- FireTner for help with early prototyping
- LouParmi and Auzifriend for assistance wiring the pivot smaller
- Aminotreal for the XOR idea
- FEARLESS_Z_ for the initial layout
- and to anyone who uses this ALU or pivoting in their CPUs <3
Timing
- Synced
- ✓
- Changes tested
- 392,192
Versions
| Version | Date | By | What it fixed | File |
|---|---|---|---|---|
| 2, current | 2026-10-30 | Unused blocks taken out | ||
| 1 | 2026-10-30 | embizone | First upload | Download |