PiCoCo
About the PiCoCo PCB
PiCoCo is an open source PCB design by cognitivegears, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 98 × 77.2 mm, with 45 components from 19 distinct parts.
Other key parts include the SN74LVC245ADWR, AMS1117-3.3 and SN74LVC00ADR. By type, the board carries 21 resistors, 14 capacitors, 6 ICs, 3 transistors and 1 diode.
From the project
CoCo cartridge interface with the Pi Pico
A Raspberry Pi Pico 2 (or Waveshare RP2350B-Plus-W) carrier that plugs into the cartridge slot of a Tandy Color Computer (CoCo 1/2/3). It boots an HDB-DOS ROM, serves DriveWire disk images through a Becker port at $FF41/$FF42, and has an output stage for the cartridge sound input (the sound firmware is not written). Licence: CERN-OHL-S-2.0 (hardware), MIT (firmware), CC-BY-SA-4.0 (docs); see LICENSE.
Main components on the PiCoCo
PiCoCo bill of materials (BOM)
45 components, 19 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | SN74LVC245ADWR SN74LVC245A | SOIC-20W_7.5x12.8mm_P1.27mm | U10, U11, U12, U13 |
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | U14 |
| 1 | SN74LVC00ADR SN74LVC00A | SOIC-14_3.9x8.7mm_P1.27mm | U15 |
| 3 | 2N7002 | SOT-23 | Q2, Q3, Q4 |
| 1 | SS14 | D_SMA | D2 |
| 3 | 0805 10uF 10uF | C_0805_2012Metric | C1, C2, C16 |
| 1 | 0805 22uF 22uF | C_0805_2012Metric | C3 |
| 6 | 0805 100nF 100nF | C_0805_2012Metric | C4, C6, C7, C8, C9, C10 |
| 1 | 1000uF 6.3V SMD electrolytic D8x10 1000uF 6.3V | CP_Elec_8x10 | C12 |
| 2 | 0805 10nF 10nF | C_0805_2012Metric | C13, C14 |
| 1 | 0805 1uF 1uF | C_0805_2012Metric | C15 |
| 3 | 0805 4.7k 1% 4.7k | R_0805_2012Metric | R1, R2, R3 |
| 5 | 0805 10k 1% 10k | R_0805_2012Metric | R4, R7, R10, R23, R25 |
| 4 | 0805 100 1% 100 | R_0805_2012Metric | R8, R9, R15, R16 |
| 2 | 0805 33 1% 33 | R_0805_2012Metric | R11, R12 |
| 2 | 0805 100k 1% 100k | R_0805_2012Metric | R17, R18 |
| 2 | 0805 470 1% 470 | R_0805_2012Metric | R19, R20 |
| 2 | 0805 1k 1% 1k | R_0805_2012Metric | R21, R22 |
| 1 | 0805 0 1% 0 | R_0805_2012Metric | R24 |
PiCoCo design files
The KiCad project lives in the cognitivegears/PiCoCo repository on GitHub; these links point at the commit this page was built from.
PiCoCo: common questions
How big is the PiCoCo PCB?
The PiCoCo measures 98 × 77.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the PiCoCo?
45 components, from 19 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the PiCoCo design files?
From the cognitivegears/PiCoCo repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the PiCoCo design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which cognitivegears chose for the repository.
