4 layers108 × 35.8 mm
SIMM72BL
demik/oldworld
Development ressources for Old World Macintosh (68k and NuBus PPC) and a few related things…
135 parts27CERN-OHL-P-2.0
4 layers77.5 × 44.7 mm
VIA Plus
demik/oldworld27Development ressources for Old World Macintosh (68k and NuBus PPC) and a few related things…
- Size
- 77.5 × 44.7 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 20
- Nets
- 73
- Pads
- 175
- Tracks, vias
- 677, 20
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 6 May 2020
- Updated
- 21 Aug 2026
Overview
VIA Plus 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 77.5 × 44.7 mm with 20 parts on 73 nets, routed with 677 tracks and 20 vias.
It is built around the 74LS161DC and LDS-A3502RD-SUG. Its parts include 8 resistors, 5 ICs and 4 capacitors. It belongs with the retro computing and games boards and the FPGA and CPLD boards of this library.
Main components
2README
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
20| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 470Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8 |
| 4 | 100nF | Capacitor_THT:C_Axial_L3.8mm_D2.6mm_P7.50mm_Horizontal | C1, C2, C3, C4 |
| 1 | 74LS161 | Package_DIP:DIP-16_W7.62mm | U5 |
| 1 | 74LS244 | Package_DIP:DIP-20_W7.62mm | U4 |
| 1 | GAL16V8 | Package_DIP:DIP-20_W7.62mm | U3 |
| 1 | LDS-A3502RD-SUG | lib:LDS-A3502RD-SUG | DS1 |
| 1 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1 |
| 1 | WD65C22 | Package_LCC:PLCC-44_THT-Socket | U2 |
| 1 | WD65C22 | Package_DIP:DIP-40_W15.24mm | U1 |
The 19 most common of 20 parts.
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Questions
How big is the VIA Plus PCB?
It measures 77.5 × 44.7 mm and has 4 copper layers, 1.6 mm thick.
What parts does the VIA Plus use?
20 parts, built around the 74LS161DC and LDS-A3502RD-SUG. 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 VIA Plus KiCad files?
From the demik/oldworld repository on GitHub, at the commit this page was made from: the board is EDA/VIA Plus/VIA Plus.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 VIA Plus 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).