2 layers370.8 × 298.5 mm
8 Bit Computer
The-Invent0r/8-bit-Computer-PCB
These are the KiCAD files for my 8-Bit Computer.
323 parts142
2 layers159 × 140 mm
8-bit adder subtractor pcb
alphaseneca/8-bit_adder_subtractorAn 8-bit adder/subtractor circuit implemented using logic gates IC for arithmetic operations.
- Size
- 159 × 140 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 134
- Nets
- 95
- Pads
- 556
- Tracks, vias
- 858, 103
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 25 Dec 2023
- Updated
- 24 Apr 2025
Overview
8-bit adder subtractor pcb is an open-source printed circuit board by alphaseneca, from the alphaseneca/8-bit_adder_subtractor repository on GitHub. It is a 2-layer board of 159 × 140 mm with 134 parts on 95 nets, routed with 858 tracks and 103 vias.
It is built around the 74LS86 and 74LS32SC. Its parts include 28 resistors, 27 diodes, 24 ICs, 17 switches and 1 connector. It belongs with the retro computing and games boards of this library.
Main components
2README
README.md8-bit_adder_subtractor
An 8-bit adder/subtractor circuit implemented using logic gates IC for arithmetic operations.
Parts
134| Qty | Value | Footprint | References |
|---|---|---|---|
| 27 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23 +11 |
| 17 | SW_DPDT_x2 | ddpt:SWITCH_S20203 | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17 +1 |
| 12 | 74LS86 | Package_DIP:DIP-14_W7.62mm | U1, U1, U2, U2, U4, U4, U7, U7, U8, U8, U10, U10 |
| 8 | 74LS08 | Package_DIP:DIP-14_W7.62mm | U3, U3, U5, U5, U9, U9, U11, U11 |
| 8 | Total | LED_THT:LED_D3.0mm | D19, D20, D21, D22, D23, D24, D25, D26 |
| 8 | ValueA | LED_THT:LED_D3.0mm | D3, D4, D5, D6, D7, D8, D9, D10 |
| 8 | ValueB | LED_THT:LED_D3.0mm | D11, D12, D13, D14, D15, D16, D17, D18 |
| 4 | 74LS32 | Package_DIP:DIP-14_W7.62mm | U6, U6, U12, U12 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3mm_Pad | H1, H2, H3, H4 |
| 2 | LOGO | Assets:logo | G***, G*** |
| 1 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | Addition | LED_THT:LED_D3.0mm | D1 |
| 1 | Barrel_Jack | Connector_BarrelJack:BarrelJack_Horizontal | J1 |
| 1 | Carry | LED_THT:LED_D3.0mm | D27 |
| 1 | G*** | kibuzzard-6723CD21 | kibuzzard-6723CD21 |
| 1 | G*** | kibuzzard-672491A3 | kibuzzard-672491A3 |
| 1 | G*** | kibuzzard-6723CD2D | kibuzzard-6723CD2D |
| 1 | G*** | kibuzzard-6723CD1A | kibuzzard-6723CD1A |
| 1 | G*** | kibuzzard-6723CD14 | kibuzzard-6723CD14 |
| 1 | G*** | kibuzzard-6723CD06 | kibuzzard-6723CD06 |
| 1 | G*** | kibuzzard-6723D2E6 | kibuzzard-6723D2E6 |
| 1 | G*** | kibuzzard-672327D0 | kibuzzard-672327D0 |
| 1 | G*** | kibuzzard-6723D31B | kibuzzard-6723D31B |
| 1 | G*** | kibuzzard-6723280D | kibuzzard-6723280D |
| 1 | G*** | kibuzzard-6723CD27 | kibuzzard-6723CD27 |
| 1 | G*** | kibuzzard-6723D2CE | kibuzzard-6723D2CE |
| 1 | G*** | kibuzzard-6723279E | kibuzzard-6723279E |
| 1 | G*** | kibuzzard-6723D320 | kibuzzard-6723D320 |
| 1 | G*** | kibuzzard-6723D2DF | kibuzzard-6723D2DF |
| 1 | G*** | kibuzzard-6723D2EE | kibuzzard-6723D2EE |
| 1 | G*** | kibuzzard-672327D8 | kibuzzard-672327D8 |
| 1 | G*** | kibuzzard-672327DE | kibuzzard-672327DE |
| 1 | G*** | kibuzzard-6723CD0E | kibuzzard-6723CD0E |
| 1 | G*** | kibuzzard-672327E5 | kibuzzard-672327E5 |
| 1 | G*** | kibuzzard-672327C5 | kibuzzard-672327C5 |
| 1 | G*** | kibuzzard-68098BF2 | kibuzzard-68098BF2 |
| 1 | G*** | kibuzzard-672327EF | kibuzzard-672327EF |
| 1 | G*** | kibuzzard-6723D2D3 | kibuzzard-6723D2D3 |
| 1 | G*** | kibuzzard-6723CCFE | kibuzzard-6723CCFE |
| 1 | G*** | kibuzzard-6723D341 | kibuzzard-6723D341 |
| 1 | G*** | kibuzzard-67232848 | kibuzzard-67232848 |
| 1 | G*** | kibuzzard-672327BC | kibuzzard-672327BC |
| 1 | G*** | kibuzzard-6723D2C8 | kibuzzard-6723D2C8 |
| 1 | G*** | kibuzzard-6723D2BC | kibuzzard-6723D2BC |
| 1 | Subtraction | LED_THT:LED_D3.0mm | D2 |
The 133 most common of 134 parts.
Questions
How big is the 8-bit adder subtractor pcb PCB?
It measures 159 × 140 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 8-bit adder subtractor pcb use?
134 parts, built around the 74LS86 and 74LS32SC. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the 8-bit adder subtractor pcb KiCad files?
From the alphaseneca/8-bit_adder_subtractor repository on GitHub, at the commit this page was made from: the board is 8-bit_adder_subtractor_pcb/8-bit_adder_subtractor_pcb.kicad_pcb and its schematic 8-bit_adder_subtractor_pcb/8-bit_adder_subtractor_pcb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 8-bit adder subtractor pcb design in my own project?
Its repository states no licence, so its author keeps all rights: ask alphaseneca before reusing the design.
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