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
2 layers100 × 50 mm
ADBDB
demik/oldworld27Development ressources for Old World Macintosh (68k and NuBus PPC) and a few related things…
- Size
- 100 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 39
- Nets
- 50
- Pads
- 155
- Tracks, vias
- 428, 34
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 6 May 2020
- Updated
- 21 Aug 2026
Overview
ADBDB 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 2-layer board of 100 × 50 mm with 39 parts on 50 nets, routed with 428 tracks and 34 vias.
It is built around the NE555P and HDSP-4840. Its parts include 11 resistors, 7 connectors, 5 capacitors, 4 ICs and 2 switches. It belongs with the retro computing and games boards and the PIC 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
39| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 270Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R3, R4, R5, R6, R7, R8, R9, R10, R11 |
| 4 | 100nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C3, C5 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2, J6, J7 |
| 3 | PIC12F1840-IP | Package_DIP:DIP-8_W7.62mm | U1, U2, U3 |
| 2 | LD11-0246FLF | Package_DIP:DIP-8_W7.62mm | RF1, RF2 |
| 2 | Mini-DIN-4 | Connector_Apple:5749181-1 | J3, J5 |
| 2 | SW_DIP_x03 | Button_Switch_THT:SW_DIP_SPSTx03_Slide_9.78x9.8mm_W7.62mm_P2.54mm | SW1, SW2 |
| 1 | 100uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C4 |
| 1 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | 470Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | Amphenol 61729 | Connector_USB:USB_B_Lumberg_2411_02_Horizontal | J1 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4 |
| 1 | HDSP-4840 | Display:HDSP-4840 | BAR1 |
| 1 | LOGO | ADB_logo_5mm:ADB_logo_5mm | G*** |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U5 |
| 1 | Polyfuse MF-R020 | Fuse:Fuse_Bourns_MF-RHT050 | F1 |
Questions
How big is the ADBDB PCB?
It measures 100 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ADBDB use?
39 parts, built around the NE555P and HDSP-4840. 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 ADBDB KiCad files?
From the demik/oldworld repository on GitHub, at the commit this page was made from: the board is EDA/ADBDB/ADBDB.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 ADBDB 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).
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