Steve 68k
About the Steve 68k PCB
Steve 68k is an open source PCB design by stevegg, published on GitHub. It is a 2-layer board measuring 177 × 140.7 mm, with 91 components from 45 distinct parts.
Other key parts include the GAL16V8, 68010D, 74LS148, 68681 and Max705. By type, the board carries 31 resistors, 19 diodes, 18 capacitors, 11 connectors, 9 ICs and 1 transistor.
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 Steve 68k
Steve 68k bill of materials (BOM)
91 components, 45 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | GAL16V8 | DIP-20_W7.62mm_Socket_LongPads | U1, U3, U5 |
| 1 | 68010D | DIP-64_W22.86mm_Socket_LongPads | U2 |
| 1 | 74LS148 | DIP-16_W7.62mm_Socket_LongPads | U4 |
| 1 | 68681 | DIP-40_W15.24mm_Socket_LongPads | U6 |
| 1 | Max705 | DIP-8_W7.62mm_Socket_LongPads | U8 |
| 2 | 74LS373 | DIP-20_W7.62mm_Socket_LongPads | U9, U10 |
| 1 | 3.6864MHz | Crystal_HC49-4H_Vertical | Q1 |
| 1 | 8Mhz | Oscillator_DIP-8 | X1 |
| 1 | Power | PinHeader_1x06_P2.54mm_Vertical | J1 |
| 3 | Conn_02x32_Odd_Even | PinSocket_2x32_P2.54mm_Vertical | J2, J5, J9 |
| 2 | Serial A | PinHeader_1x06_P2.54mm_Vertical | J3, J4 |
| 1 | Data Bus | PinHeader_1x18_P2.54mm_Vertical | J6 |
| 1 | Debug | PinHeader_1x10_P2.54mm_Vertical | J7 |
| 1 | Duart OP | PinHeader_1x08_P2.54mm_Vertical | J8 |
| 1 | Debug 2 | PinHeader_1x12_P2.54mm_Vertical | J10 |
| 1 | Duart IP | PinHeader_1x06_P2.54mm_Vertical | J11 |
| 1 | Reset | SW_PUSH_6mm | SW1 |
| 1 | PWR LED | LED_D3.0mm_Clear | D1 |
| 1 | HALT | LED_D3.0mm_Clear | D2 |
| 1 | RUN | LED_D3.0mm_Clear | D3 |
Show 25 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Data0 | LED_D3.0mm_Clear | D6 |
| 1 | Data1 | LED_D3.0mm_Clear | D7 |
| 1 | Data2 | LED_D3.0mm_Clear | D8 |
| 1 | Data3 | LED_D3.0mm_Clear | D9 |
| 1 | Data4 | LED_D3.0mm_Clear | D10 |
| 1 | Data5 | LED_D3.0mm_Clear | D11 |
| 1 | Data6 | LED_D3.0mm_Clear | D12 |
| 1 | Data7 | LED_D3.0mm_Clear | D13 |
| 1 | Data8 | LED_D3.0mm_Clear | D14 |
| 1 | Data9 | LED_D3.0mm_Clear | D15 |
| 1 | Data10 | LED_D3.0mm_Clear | D16 |
| 1 | Data11 | LED_D3.0mm_Clear | D17 |
| 1 | Data12 | LED_D3.0mm_Clear | D18 |
| 1 | Data13 | LED_D3.0mm_Clear | D19 |
| 1 | Data14 | LED_D3.0mm_Clear | D20 |
| 1 | Data15 | LED_D3.0mm_Clear | D21 |
| 1 | 100nf | C_Disc_D3.4mm_W2.1mm_P2.50mm | C1 |
| 11 | .1uF | C_Disc_D3.4mm_W2.1mm_P2.50mm | C2, C3, C4, C5, C6, C7, C8, C9 +3 |
| 1 | 15pf | C_Disc_D3.4mm_W2.1mm_P2.50mm | C10 |
| 1 | 5pf | C_Disc_D3.4mm_W2.1mm_P2.50mm | C11 |
| 1 | 470uF | CP_Radial_D6.3mm_P2.50mm | C16 |
| 3 | 100uF | CP_Radial_D5.0mm_P2.50mm | C17, C18, C19 |
| 1 | Rk7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 11 | 4K7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3, R4, R5, R6, R7, R8, R9 +3 |
| 19 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R12, R14, R15, R18, R19, R20, R21, R22 +11 |
Steve 68k 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.
- Layouthardware/Steve 68k.kicad_pcb
- Schematichardware/Steve 68k.kicad_sch
Steve 68k: common questions
How big is the Steve 68k PCB?
The Steve 68k measures 177 × 140.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Steve 68k?
91 components, from 45 distinct parts. The full bill of materials is listed on this page.
Where can I download the Steve 68k 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 Steve 68k 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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