ALU
About the ALU PCB
ALU is an open source PCB design by emperor-hadrian, published on GitHub. It is a 2-layer board measuring 296 × 139 mm, with 59 components from 8 distinct parts.
By type, the board carries 54 ICs and 5 resistors.
From the project
Design for a DIY computer
The timing will be completely redone: A single normal clock signal, not the stupid "AB Alternating" I made up for the original. The PC will be incremented and a new instruction fetched during any non-flow-control instructions except when the GPRAM is used and the PC is in the same RAM chip (the RAM chips have 15 address lines each) as whatever is being accessed. The bus timing will also be very flexible and will be faster when possible but still slow when the memory is being accessed twice for example. Bus read/write addresses are both now 5 bits. The WRITE/MOVE instruction formats will…
ALU bill of materials (BOM)
59 components, 8 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ~ | PinHeader_1x04_P2.54mm_Vertical | U1 |
| 1 | ~ | PinHeader_1x23_P2.54mm_Vertical | U2 |
| 1 | ~ | PinHeader_1x30_P2.54mm_Horizontal | U3 |
| 14 | ~ | DIP-20_W7.62mm | U4, U5, U6, U14, U16, U17, U20, U22 +6 |
| 12 | ~ | DIP-16_W7.62mm | U7, U8, U13, U15, U30, U31, U32, U33 +4 |
| 21 | ~ | DIP-14_W7.62mm | U9, U10, U11, U12, U18, U19, U21, U23 +13 |
| 4 | ~ | jumper | U46, U47, U48, U49 |
| 5 | 10K 10k | 0.4_pitch_resistor | R1, R2, R3, R4, R5 |
ALU design files
The KiCad project lives in the emperor-hadrian/stack_machine repository on GitHub; these links point at the commit this page was built from.
ALU: common questions
How big is the ALU PCB?
The ALU measures 296 × 139 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the ALU?
59 components, from 8 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the ALU design files?
From the emperor-hadrian/stack_machine repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the ALU design in my own project?
The repository has no license, so all rights stay with emperor-hadrian. Use it as a reference, and ask the author before reusing the design.
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