2 layers43.9 × 27.7 mm
2 layers100 × 90 mm
PicoSCSI
Mr-Bossman/picoSCSIA SD to Parallel SCSI hard drive emulator
- Size
- 100 × 90 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 43
- Pads
- 211
- Tracks, vias
- 62, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 30 Aug 2025
- Updated
- 22 Sep 2025
Overview
PicoSCSI is an open-source printed circuit board by Mr-Bossman, from the Mr-Bossman/picoSCSI repository on GitHub. It is a 2-layer board of 100 × 90 mm with 19 parts on 43 nets, routed with 62 tracks and 0 vias.
Its parts include 3 diodes, 3 connectors and 1 resistor. It belongs with the RP2040 boards of this library.
README
Readme.mdPicoSCSI
A SD sard to Parallel SCSI hard drive emulator
Board
The board design is lossely based on the BlueSCSI V1 and the ZuluSCSI Pico. The RP2350 the MCU on the Raspberry PI Pico 2 is 5V tollerant meaning no level translation logic is nessasary. Like BlueSCSI this outputs 3.3V to the bus, which is compliant with LV SCSI.
Documents relating to 5V tollerance
Piers Finlayson's video on the RP2350 variant of one-rom talks about caveats this may have. The A4 silicon revision adds support for this https://www.raspberrypi.com/news/rp2350-a4-rp2354-and-a-new-hacking-challenge noted at the bottom.
Firmware
Coming soon will be based on ZuluSCSI firmware
TODO:
Add both SMD and THT versions Add DB25 version Fix Pi Pico not having combined THT and SMD footprint
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_ISO7380 | H1, H2, H3, H4 |
| 2 | 1N4001 | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D2, D3 |
| 2 | 220 | Resistor_THT:R_Array_SIP10 | RN1, RN2 |
| 2 | 330 | Resistor_THT:R_Array_SIP10 | RN3, RN4 |
| 2 | TERM_EN | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | JP1, JP4 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1 |
| 1 | Floppy Power | Connector_JST:JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | J3 |
| 1 | Micro_SD_Card | Connector_Card:microSD_HC_Wuerth_693072010801 | J2 |
| 1 | POWER LED | LED_THT:LED_D5.0mm | D1 |
| 1 | POWER LED ENABLE | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP3 |
| 1 | RaspberryPi_Pico_W | Module:RaspberryPi_Pico_W_SMD_HandSolder | A1 |
| 1 | SCSI_CONN | Connector_IDC:IDC-Header_2x25_P2.54mm_Vertical | J1 |
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Questions
How big is the PicoSCSI PCB?
It measures 100 × 90 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PicoSCSI use?
19 parts. 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 PicoSCSI KiCad files?
From the Mr-Bossman/picoSCSI repository on GitHub, at the commit this page was made from: the board is picoSCSI/picoSCSI.kicad_pcb and its schematic picoSCSI/picoSCSI.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PicoSCSI design in my own project?
Its repository states no licence, so its author keeps all rights: ask Mr-Bossman before reusing the design.