ALU
About the ALU PCB
ALU is an open source PCB design by Robert-Riordan-UCD, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 100.4 × 56.8 mm, with 33 components from 12 distinct parts.
Other key parts include the SN74F86N, SN74HCT245N, CD74HCT283E and Dual D FF. By type, the board carries 10 diodes, 10 resistors, 8 ICs, 4 connectors and 1 capacitor.
It belongs with the dev boards & breakouts designs in this gallery.
From the project
PCB version of Ben Eaters 8-bit breadboard computer
This is my version of Ben Eaters 8-bit breadboard SAP-1 CPU, converted to a PCB. I have made some minor changes as I could not find all of the components as listed in Ben's part list.
1. RAM IC's have been replaced with ATMega328-PU's. This should allow me to have persistant programs between power cycles.
CERN Open Hardware Licence Version 2 - Permissive
Main components on the ALU
ALU bill of materials (BOM)
33 components, 12 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | SN74F86N | 4x_xor | U1, U2 |
| 1 | SN74HCT245N | 8x_tristate_transceiver | U3 |
| 2 | CD74HCT283E | 4bit_full_adder | U4, U5 |
| 1 | ~ | 4x_and | U6 |
| 1 | ~ | DIP-14_W7.62mm | U7 |
| 1 | Dual D FF | 2x_D_FF | U8 |
| 1 | Conn_01x07_Pin | PinHeader_1x07_P2.54mm_Vertical | J1 |
| 2 | Conn_01x08_Pin | PinHeader_1x08_P2.54mm_Vertical | J2, J3 |
| 1 | Conn_01x10_Pin | PinHeader_1x10_P2.54mm_Vertical | J4 |
| 10 | LED | LED_D5.0mm | D1, D2, D3, D4, D5, D6, D7, D8 +2 |
| 1 | 0.1uF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C1 |
| 10 | 220 | CF_series_Resistors_THT | R1, R2, R3, R4, R5, R6, R7, R8 +2 |
ALU design files
The KiCad project lives in the Robert-Riordan-UCD/8_Bit_CPU_PCB repository on GitHub; these links point at the commit this page was built from.
- LayoutALU/ALU.kicad_pcb
- SchematicALU/ALU.kicad_sch
ALU: common questions
How big is the ALU PCB?
The ALU measures 100.4 × 56.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the ALU?
33 components, from 12 distinct parts. The full bill of materials is listed on this page.
Where can I download the ALU design files?
From the Robert-Riordan-UCD/8_Bit_CPU_PCB repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the ALU design in my own project?
Yes, under the terms of its CERN-OHL-P-2.0 license, which Robert-Riordan-UCD chose for the repository.
More boards in 8_Bit_CPU_PCB
Control
144.8 × 73.9 mm64 parts2LCERN-OHL-P-2.00
AVR/ArduinoRAM
133 × 58.5 mm57 parts2LCERN-OHL-P-2.00
Bus
62.2 × 274.1 mm50 parts4LCERN-OHL-P-2.00
ClockModule
81.5 × 52.5 mm30 parts2LCERN-OHL-P-2.00
Registers
89.8 × 50.6 mm27 parts2LCERN-OHL-P-2.00
MemoryAccessRegister
84.3 × 39.3 mm22 parts2LCERN-OHL-P-2.00
Output
109.7 × 49.5 mm15 parts2LCERN-OHL-P-2.00
ProgramCounter
58.6 × 38 mm13 parts2LCERN-OHL-P-2.00
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