8bitCPU
About the 8bitCPU PCB
8bitCPU is an open source PCB design by BrainwashAlpha, published on GitHub. It is a 4-layer board measuring 246.4 × 185.4 mm, with 277 components from 40 distinct parts.
Other key parts include the LM555, 74LS04, 74LS08, 74LS32 and 74LS245. By type, the board carries 104 resistors, 85 diodes, 53 ICs, 24 capacitors, 8 switches and 1 connector.
From the project
all credit to ben eater
Main components on the 8bitCPU
8bitCPU bill of materials (BOM)
277 components, 40 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | LM555 | DIP-8_W7.62mm | U1, U2, U3, U39 |
| 5 | 74LS04 | DIP-14_W7.62mm | U4, U28, U29, U49, U53 |
| 3 | 74LS08 | DIP-14_W7.62mm | U5, U23, U46 |
| 1 | 74LS32 | DIP-14_W7.62mm | U6 |
| 6 | 74LS245 | DIP-20_W7.62mm | U7, U10, U13, U17, U30, U36 |
| 8 | 74LS173 | DIP-16_W7.62mm | U8, U9, U11, U12, U14, U15, U19, U34 |
| 2 | 74LS86 | DIP-14_W7.62mm | U16, U18 |
| 2 | 74LS283 | DIP-16_W7.62mm | U20, U21 |
| 1 | 74LS02 | DIP-14_W7.62mm | U22 |
| 2 | 74189 | DIP-16_W7.62mm | U24, U25 |
| 4 | 74LS157 | DIP-16_W7.62mm | U26, U27, U32, U33 |
| 2 | 74LS00 | DIP-14_W7.62mm | U31, U51 |
| 2 | 74LS161 | DIP-16_W7.62mm | U35, U48 |
| 1 | 74LS76 | DIP-16_W7.62mm | U37 |
| 1 | 74LS139 | DIP-16_W7.62mm | U38 |
| 4 | 7SEGMENT_CC | 7SegmentLED_LTS6760_LTS6780 | U40, U41, U42, U43 |
| 1 | 74LS273 | DIP-20_W7.62mm | U44 |
| 3 | 28C16 | DIP-24_W15.24mm_Socket | U45, U47, U52 |
| 1 | 74LS138 | DIP-16_W7.62mm | U50 |
| 1 | USB_B | USB_B_OST_USB-B1HSxx_Horizontal | J1 |
Show 20 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 1M | Potentiometer-5.5mm | RV1 |
| 2 | SW_Push | SW_PUSH_6mm_H5mm | SW1, SW4 |
| 3 | SW_SPDT | DPDT-pushbutton | SW2, SW6, SW7 |
| 1 | SW_DIP_x08 | SW_DIP_SPSTx08_Slide_9.78x22.5mm_W7.62mm_P2.54mm | SW3 |
| 1 | SW_DIP_x04 | SW_DIP_SPSTx04_Slide_9.78x12.34mm_W7.62mm_P2.54mm | SW5 |
| 1 | Reset | SW_PUSH_6mm_H5mm | SW8 |
| 1 | G*** | BenEater | svg2mod |
| 21 | BLUE | LED_D5.0mm | D1, D26, D27, D28, D29, D58, D59, D60 +13 |
| 44 | RED | LED_D5.0mm | D2, D3, D4, D5, D6, D7, D8, D9 +36 |
| 8 | YELLOW | LED_D5.0mm | D30, D31, D32, D33, D44, D45, D46, D47 |
| 12 | GREEN | LED_D5.0mm | D34, D35, D49, D50, D52, D53, D55, D56 +4 |
| 16 | 0.1µF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C3, C10, C11, C12, C13, C14, C15 +8 |
| 6 | 0.01µF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C2, C4, C5, C7, C8, C9 |
| 1 | 1µF | CP_Radial_D5.0mm_P2.00mm | C6 |
| 1 | 10µF | CP_Radial_D5.0mm_P2.00mm | C24 |
| 10 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R5, R6, R58, R63, R64 +2 |
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 83 | 220 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R16, R17, R18, R19, R20, R21, R22 +75 |
| 9 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8, R9, R10, R11, R12, R13, R14, R15 +1 |
| 1 | 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R66 |
8bitCPU design files
The KiCad project lives in the BrainwashAlpha/8bitCPU repository on GitHub; these links point at the commit this page was built from.
- Layout8bit-computer.kicad_pcb
8bitCPU: common questions
How big is the 8bitCPU PCB?
The 8bitCPU measures 246.4 × 185.4 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the 8bitCPU?
277 components, from 40 distinct parts. The full bill of materials is listed on this page.
Where can I download the 8bitCPU design files?
From the BrainwashAlpha/8bitCPU repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the 8bitCPU design in my own project?
The repository has no license, so all rights stay with BrainwashAlpha. Use it as a reference, and ask the author before reusing the design.