SAP-Plus ALU
About the SAP-Plus ALU PCB
SAP-Plus ALU is an open source PCB design by TomNisbet, published on GitHub under the MIT license. It is a 2-layer board measuring 102 × 96 mm, with 35 components from 26 distinct parts.
Other key parts include the 74LS283, 74LS245, 74LS173, 74LS10 and 74LS27. By type, the board carries 13 diodes, 6 ICs, 6 capacitors, 6 resistors and 4 connectors.
From the project
Simple As Possible (SAP) 8-bit computer with a modular PCB design
Add FL LED Fix carry in LED polarity Fix non-inverted FL signal by replacing 3-inout AND with NAND, inverting zero-detect with second gate, and using the third to fix FL Add module interconnect labels to the A/B registers
Main components on the SAP-Plus ALU
SAP-Plus ALU bill of materials (BOM)
35 components, 26 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 74LS283 | DIP-16_W7.62mm | U1, U2 |
| 1 | 74LS245 | DIP-20_W7.62mm | U3 |
| 1 | 74LS173 | DIP-16_W7.62mm | U4 |
| 1 | 74LS10 | DIP-14_W7.62mm | U5 |
| 1 | 74LS27 | DIP-14_W7.62mm | U6 |
| 2 | Bus | PinHeader_1x40_P2.54mm_Vertical | J1, J2 |
| 1 | to A Register | PinHeader_1x08_P2.54mm_Vertical | J3 |
| 1 | to B Register | PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | READ | LED_D3.0mm | D1 |
| 1 | FC | LED_D3.0mm | D2 |
| 1 | FZ | LED_D3.0mm | D3 |
| 1 | CI | LED_D3.0mm | D4 |
| 1 | L0 | LED_D3.0mm | D5 |
| 1 | L1 | LED_D3.0mm | D6 |
| 1 | L2 | LED_D3.0mm | D7 |
| 1 | L3 | LED_D3.0mm | D8 |
| 1 | L4 | LED_D3.0mm | D9 |
| 1 | L5 | LED_D3.0mm | D10 |
| 1 | L6 | LED_D3.0mm | D11 |
| 1 | L7 | LED_D3.0mm | D12 |
Show 6 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | FL | LED_D3.0mm | D13 |
| 6 | 0.1uF | C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C3, C4, C5, C6 |
| 1 | R-GN | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 2 | R-WHT | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R3 |
| 2 | R-BLU | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4, R5 |
| 1 | R_Network08_US | R_Array_SIP9 | RN1 |
SAP-Plus ALU design files
The KiCad project lives in the TomNisbet/sap-plus repository on GitHub; these links point at the commit this page was built from.
- Layoutschematics/alu/alu.kicad_pcb
- Schematicschematics/alu/alu.kicad_sch
SAP-Plus ALU: common questions
How big is the SAP-Plus ALU PCB?
The SAP-Plus ALU measures 102 × 96 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the SAP-Plus ALU?
35 components, from 26 distinct parts. The full bill of materials is listed on this page.
Where can I download the SAP-Plus ALU design files?
From the TomNisbet/sap-plus repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the SAP-Plus ALU design in my own project?
Yes, under the terms of its MIT license, which TomNisbet chose for the repository.
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