2 layers301.2 × 91.9 mm
Design68
demik/oldworld
Development ressources for Old World Macintosh (68k and NuBus PPC) and a few related things…
102 parts27CERN-OHL-P-2.0
4 layers108 × 35.8 mm
SIMM72BL
demik/oldworld27Development ressources for Old World Macintosh (68k and NuBus PPC) and a few related things…
- Size
- 108 × 35.8 mm
- Copper layers
- 4
- Thickness
- 1.2 mm
- Parts
- 135
- Nets
- 186
- Pads
- 586
- Tracks, vias
- 1,622, 226
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 6 May 2020
- Updated
- 21 Aug 2026
Overview
SIMM72BL is an open-source printed circuit board by demik, from the demik/oldworld repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 4-layer board of 108 × 35.8 mm with 135 parts on 186 nets, routed with 1,622 tracks and 226 vias.
It is built around the 74HC14. Its parts include 55 resistors, 54 diodes, 13 capacitors, 10 ICs and 1 connector. It belongs with the retro computing and games boards of this library.
Main components
1README
EDA/VIA PLCC2DIP/README.mdVIA PLCC2DIP
Simple VIA Adapter to use or test PLCC VIA 6522 on DIP based boards or breakboards
Pins labelled on top of the PCB. Power LED as extra
Building, BOM
- One PLCC-44 Through-hole socket
- Machine pin headers (2x20)
The gerbers files are downloadable here
Parts
135| Qty | Value | Footprint | References |
|---|---|---|---|
| 33 | 3kΩ | Resistor_SMD:R_0402_1005Metric | R1, R2, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23 +17 |
| 32 | GREEN | Diode_SMD:D_0805_2012Metric | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +16 |
| 22 | 510Ω | Resistor_SMD:R_0402_1005Metric | R33, R34, R35, R36, R37, R38, R39, R40, R41, R42, R43, R44, R45, R46, R47, R48 +6 |
| 20 | YELLOW | Diode_SMD:D_0805_2012Metric | D33, D34, D35, D36, D37, D38, D39, D40, D41, D42, D43, D44, D45, D46, D47, D48 +4 |
| 11 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C4, C5, C6, C7, C8, C9, C12, C13 |
| 9 | 74HC14 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U2, U3, U4, U5, U6, U7, U8, U9, U10 |
| 2 | 10uF | Capacitor_Tantalum_SMD:CP_EIA-3216-10_Kemet-I | C10, C11 |
| 1 | 5822021-4 | 5822021-4_EoB:5822021-4_EoB | J1 |
| 1 | RED | Diode_SMD:D_0805_2012Metric | D54 |
| 1 | SIMM-72 | Connector_Apple:SIMM-72 | U1 |
| 1 | WHITE | Diode_SMD:D_0805_2012Metric | D53 |
The 133 most common of 135 parts.
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Questions
How big is the SIMM72BL PCB?
It measures 108 × 35.8 mm and has 4 copper layers, 1.2 mm thick.
What parts does the SIMM72BL use?
135 parts, built around the 74HC14. 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 SIMM72BL KiCad files?
From the demik/oldworld repository on GitHub, at the commit this page was made from: the board is EDA/SIMM72BL/SIMM72BL.kicad_pcb and its schematic EDA/68k-nano+/68000sbc.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SIMM72BL design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).