2 layers66 × 100 mm
Processor Board
powsplatboom/Synth-DIY
Where I will be collecting documentation for all my synth parts
74 parts11
2 layers298.5 × 139.7 mm
Dc900 modern
jgw4/dc900Datanetics DC900 PCB Reproduction
- Size
- 298.5 × 139.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 171
- Nets
- 63
- Pads
- 658
- Tracks, vias
- 2,028, 106
- Pours
- 410
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 14 Sep 2026
- Updated
- 14 Sep 2026
Overview
Dc900 modern is an open-source printed circuit board by jgw4, from the jgw4/dc900 repository on GitHub. It is a 2-layer board of 298.5 × 139.7 mm with 171 parts on 63 nets, routed with 2,028 tracks and 106 vias.
It is built around the ATMEGA644P-20PU and NE555P. Its parts include 77 connectors, 56 switches, 6 resistors, 3 capacitors and 3 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA644P-20PU
DIP-40-40℃~+85℃ 10bit 2.7V~5.5V 20MHz 2KB 32 4KB 64KB 8 Bit AVR Built-in FLASH Power-on reset (POR)、Undervoltage detection (BOR/LVD/LVR/LVI)、Watchdog reset、External pin reset (NRST)、Built-in general-purpose timer、Programmable watchdog DIP-40 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
NE555P
DIP-80℃~+70℃ 100kHz 10mA 4.5V~16V DIP-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
README
dc900_original/README.mdOriginal Datanetics Keyboard
This board is a trace-for-trace copy of the original Datanetics keyboard, created by willegal. It contains all the flaws of the original board and requires a wire jumper to make work correctly. For more info, see the Datanetics Keyboard Reproduction.dotx file.
I would personally recommend using the modern keyboard, as it has been slightly altered to use Cherry MX keyswitches, fixes the board's mistakes, has prewritten firmware, and takes advantage of a modern ATMega644P microcontroller that is easier to obtain. If you instead want the most historical accuracy, this would be the folder to use.
Prerequisites
The PCB File is being made by importing gerber files first into KiCad, and mapping the schematics to it by applying footprints to the symbols, placing over the gerber geometry, and then removing the import gerber geometry
To Do
Schematics
- Schematics need created for the board. the source software file is a .osm file that i don't know how to open.
- footprints need assigned to all components within all schematic files. this in most cases require the creating of custom footprints to ensure reproduction accuracy
PCB
- assign accurate pin mappings to all component footprints
- place footprints in their exact spot on the PCB.
- remove any duplicate layer geometry from laying the footprint over the gerber imported layers.
- re-attach all traces/nets to the footprints
- ultimately, passing a 0 error/0 warning DRC check
Parts
171| Qty | Value | Footprint | References |
|---|---|---|---|
| 76 | jumper_pth | Apple1Keyb:ViaNoPlate | P1, P2, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21, P22, P23 +60 |
| 22 | MountHole | Apple1Keyb:MountHole | MH1, MH2, MH3, MH10, MH11, MH12, MH13, MH14, MH15, MH16, MH17, MH18, MH19, MH20, MH21, MH22 +6 |
| 2 | 100 | Passive:RESA500 | R1, R2 |
| 2 | NE555P | Package_DIP:DIP-8_W7.62mm | U2, U3 |
| 1 | !1 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW52 |
| 1 | "2 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW47 |
| 1 | #3 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW43 |
| 1 | $4 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW39 |
| 1 | %5 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW32 |
| 1 | &6 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW24 |
| 1 | '7 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW31 |
| 1 | (8 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW23 |
| 1 | )9 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW17 |
| 1 | *: | datanetics_modern:dn_SW_Cherry_MX_PCB | SW16 |
| 1 | +; | datanetics_modern:dn_SW_Cherry_MX_PCB | SW13 |
| 1 | -= | datanetics_modern:dn_SW_Cherry_MX_PCB | SW9 |
| 1 | 0 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW6 |
| 1 | 0.01uF | Passive:C_Disc_D0.2in_W0.1in_P0.2in | C2 |
| 1 | 0.1uF | Passive:C_Disc_D0.2in_W0.1in_P0.2in | C1 |
| 1 | 0.68uF | Passive:C_Disc_D0.2in_W0.1in_P0.2in | C3 |
| 1 | 3.6K | Passive:RESA500 | R4 |
| 1 | 30K | Passive:RESA500 | R6 |
| 1 | 360 | Passive:RESA500 | R3 |
| 1 | 510K | Passive:RESA500 | R5 |
| 1 | <, | datanetics_modern:dn_SW_Cherry_MX_PCB | SW19 |
| 1 | >. | datanetics_modern:dn_SW_Cherry_MX_PCB | SW20 |
| 1 | ?/ | datanetics_modern:dn_SW_Cherry_MX_PCB | SW14 |
| 1 | A | datanetics_modern:dn_SW_Cherry_MX_PCB | SW50 |
| 1 | ATmega644P-20P | Package_DIP:DIP-40_W15.24mm | U1 |
| 1 | B | datanetics_modern:dn_SW_Cherry_MX_PCB | SW38 |
| 1 | BL1 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW53 |
| 1 | BL2 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW54 |
| 1 | BL3 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW55 |
| 1 | BL4 | datanetics_modern:dn_SW_Cherry_MX_PCB | SW56 |
| 1 | C | datanetics_modern:dn_SW_Cherry_MX_PCB | SW42 |
| 1 | CHERRY_ST3 | Switch:CHERRY_ST3 | ST1 |
| 1 | CONN_2X15_LINEAR_ALPHA | Conn:EDGE_30_156 | J1 |
| 1 | CONTROL | datanetics_modern:dn_SW_Cherry_MX_PCB | SW5 |
| 1 | CR | datanetics_modern:dn_SW_Cherry_MX_PCB | SW7 |
| 1 | D | datanetics_modern:dn_SW_Cherry_MX_PCB | SW41 |
| 1 | E | datanetics_modern:dn_SW_Cherry_MX_PCB | SW40 |
| 1 | ESC | datanetics_modern:dn_SW_Cherry_MX_PCB | SW49 |
| 1 | F | datanetics_modern:dn_SW_Cherry_MX_PCB | SW35 |
| 1 | G | datanetics_modern:dn_SW_Cherry_MX_PCB | SW36 |
| 1 | H | datanetics_modern:dn_SW_Cherry_MX_PCB | SW28 |
| 1 | I | datanetics_modern:dn_SW_Cherry_MX_PCB | SW18 |
| 1 | J | datanetics_modern:dn_SW_Cherry_MX_PCB | SW27 |
| 1 | K | datanetics_modern:dn_SW_Cherry_MX_PCB | SW22 |
| 1 | L | datanetics_modern:dn_SW_Cherry_MX_PCB | SW21 |
| 1 | LF | datanetics_modern:dn_SW_Cherry_MX_PCB | SW10 |
| 1 | LOGO | Apple1Keyb:Datanetics | G1 |
| 1 | LSHIFT | datanetics_modern:dn_SW_Cherry_MX_PCB | SW3 |
| 1 | M | datanetics_modern:dn_SW_Cherry_MX_PCB | SW29 |
| 1 | N | datanetics_modern:dn_SW_Cherry_MX_PCB | SW30 |
| 1 | O | datanetics_modern:dn_SW_Cherry_MX_PCB | SW15 |
| 1 | P | datanetics_modern:dn_SW_Cherry_MX_PCB | SW11 |
| 1 | Q | datanetics_modern:dn_SW_Cherry_MX_PCB | SW48 |
| 1 | R | datanetics_modern:dn_SW_Cherry_MX_PCB | SW33 |
| 1 | REPEAT | datanetics_modern:dn_SW_Cherry_MX_PCB | SW4 |
| 1 | RESET | datanetics_modern:dn_SW_Cherry_MX_PCB | SW1 |
| 1 | RO | datanetics_modern:dn_SW_Cherry_MX_PCB | SW12 |
| 1 | RSHIFT | datanetics_modern:dn_SW_Cherry_MX_PCB | SW2 |
| 1 | S | datanetics_modern:dn_SW_Cherry_MX_PCB | SW45 |
| 1 | SP | datanetics_modern:dn_SW_Cherry_MX_PCB_SPACEBAR | SW8 |
| 1 | T | datanetics_modern:dn_SW_Cherry_MX_PCB | SW34 |
| 1 | U | datanetics_modern:dn_SW_Cherry_MX_PCB | SW25 |
| 1 | V | datanetics_modern:dn_SW_Cherry_MX_PCB | SW37 |
| 1 | W | datanetics_modern:dn_SW_Cherry_MX_PCB | SW44 |
| 1 | X | datanetics_modern:dn_SW_Cherry_MX_PCB | SW46 |
| 1 | Y | datanetics_modern:dn_SW_Cherry_MX_PCB | SW26 |
| 1 | Z | datanetics_modern:dn_SW_Cherry_MX_PCB | SW51 |
The 169 most common of 171 parts.
Questions
How big is the Dc900 modern PCB?
It measures 298.5 × 139.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Dc900 modern use?
171 parts, built around the ATMEGA644P-20PU and NE555P. 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 Dc900 modern KiCad files?
From the jgw4/dc900 repository on GitHub, at the commit this page was made from: the board is dc900_modern/dc900_modern.kicad_pcb and its schematic dc900_modern/dc900_modern.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Dc900 modern design in my own project?
Its repository states no licence, so its author keeps all rights: ask jgw4 before reusing the design.
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