CPU Board
About the CPU Board
CPU Board is an open source PCB design by stevegg, published on GitHub. It is a 2-layer board measuring 99.8 × 99.8 mm, with 29 components from 14 distinct parts.
Other key parts include the GAL16V8, 74LS148 and 68010D. By type, the board carries 13 resistors, 6 capacitors, 4 ICs, 2 connectors, 2 diodes and 1 crystal.
It belongs with the retro computing designs in this gallery.
From the project
Single Board 68k Computer
This is my extremely simple 68000 single board computer. It has 512k of ROM and 512k of RAM.
I'm building this to learn the fundamentals of microprocessors and their use in computer systems. Modern day computers are complex and require specific supporting chip sets. These retro processors were simple and much easier to understand but in the end the principles are the same.
Main components on the CPU Board
CPU Board bill of materials (BOM)
29 components, 14 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | GAL16V8 | DIP-20_W7.62mm_Socket_LongPads | U1, U3 |
| 1 | 74LS148 | DIP-16_W7.62mm_Socket_LongPads | U2 |
| 1 | 68010D | DIP-64_W22.86mm_Socket_LongPads | U4 |
| 1 | 8Mhz | Oscillator_DIP-8 | X1 |
| 1 | Conn_02x32_Odd_Even | PinHeader_2x32_P2.54mm_Horizontal | J1 |
| 1 | Conn_01x10 | PinHeader_1x10_P2.54mm_Horizontal | J2 |
| 1 | DTACK Pullup | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | HALT | LED_D5.0mm | D1 |
| 1 | RUN | LED_D5.0mm | D2 |
| 6 | .1uF | C_Disc_D3.4mm_W2.1mm_P2.50mm | C1, C2, C3, C4, C5, C6 |
| 1 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 9 | 4K7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3, R4, R5, R6, R7, R9, R10 +1 |
| 1 | Rk7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 2 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R12, R13 |
CPU Board design files
The KiCad project lives in the stevegg/Steve-68k repository on GitHub; these links point at the commit this page was built from.
- LayoutCPU Board/CPU Board.kicad_pcb
- SchematicCPU Board/CPU Board.kicad_sch
CPU Board: common questions
How big is the CPU Board?
The CPU Board measures 99.8 × 99.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the CPU Board?
29 components, from 14 distinct parts. The full bill of materials is listed on this page.
Where can I download the CPU Board design files?
From the stevegg/Steve-68k repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the CPU Board design in my own project?
The repository has no license, so all rights stay with stevegg. Use it as a reference, and ask the author before reusing the design.
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