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GBSCSI Common Platform - 2.5 Narrow, RP235x

GeorgeRudolf·GBSCSI2·EDA/DB25_Pico/GBSCSI2_DB25_Pico.kicad_pcb

GBSCSI Common Platform - 2.5 Narrow, RP235x PCB layout, top view — open source RP2040/RP2350 board by GeorgeRudolf
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About the GBSCSI Common Platform - 2.5 Narrow, RP235x PCB

GBSCSI Common Platform - 2.5 Narrow, RP235x is an open source RP2040/RP2350 PCB design by GeorgeRudolf, published on GitHub under the CERN-OHL-S-2.0 license. It is a 4-layer board measuring 53 × 31 mm, with 86 components from 32 distinct parts.

Its main chip is the RP235X_60QFN, from the RP2040/RP2350 family. Other key parts include the 74LVTH245, 74LVTH125, SN74AHC1G125DBVR, TLV62569DBV and AZ1117-2.85. By type, the board carries 46 resistors, 17 capacitors, 8 ICs, 5 diodes, 4 connectors and 2 fuses.

It belongs with the retro computing designs in this gallery.

From the project

Affordable SCSI Disk Emulator - upgrade over the original GBSCSI

NOTE: Above all, these boards were initially designed as a hack to satisfy my own personal needs. With that said, they've been tested fairly extensively. Please read this entire README.

Herein are the design files for all variants of GBSCSI2 in KiCad 7 format, being migrated to KiCad 9. The hardware in this repository is licensed CERN OHL-S V2, the full terms of which can be found at https://ohwr.org/cernohlsv2.pdf and https://ohwr.org/cernohlsv2.txt.

Main components on the GBSCSI Common Platform - 2.5 Narrow, RP235x

RP235X_60QFN74LVTH24574LVTH125SN74AHC1G125DBVRTLV62569DBVAZ1117-2.85

GBSCSI Common Platform - 2.5 Narrow, RP235x bill of materials (BOM)

86 components, 32 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
RP235X_60QFN
Pico(2(W))
U1
2
74LVTH245
U4, U5
2
74LVTH125
U6, U7
1
SN74AHC1G125DBVR
U8
1
TLV62569DBV
U9
1
AZ1117-2.85
U10
1
SCSI_50-2P_2MM
DB25_Plug
J1
1
TF003
J2
1
CONN_01X04
Conn_01x04
J5
1
CONN_01X02
Conn_01x02
J6
2
C468888
1A
F1, F2
2
JUMPER_2_OPEN
Jumper_2_Open
JP1, JP2
1
SW_DIP_x03
SW2
4
1N5819
D1, D2, D3, D4
1
C72038
YELLOW
D5
1
C5832356
1μH
L2
3
C96446
10μF
C7, C29, C30
2
C96123
47μF
C20, C35
1
12PF
12pF
C21
7
100NF
100nF
C22, C23, C24, C25, C26, C32, C33
Show 12 more
QtyPartRefs
1
C23733
4.7μF
C27
1
100NF
100nF
C28
2
C15849
1μF
C31, C34
14
4.7kΩ
R5, R6, R7, R8, R9, R10, R11, R12 +6
4
1k
R13, R14, R17, R55
19
110Ω
R25, R31, R32, R33, R34, R35, R36, R37 +11
4
1kΩ
R26, R27, R28, R30
1
10kΩ
R49
1
442kΩ
R50
1
100kΩ
R51
1
0Ω
R52
1
N/A
~
R53

GBSCSI Common Platform - 2.5 Narrow, RP235x design files

The KiCad project lives in the GeorgeRudolf/GBSCSI2 repository on GitHub; these links point at the commit this page was built from.

GBSCSI Common Platform - 2.5 Narrow, RP235x: common questions

What microcontroller does the GBSCSI Common Platform - 2.5 Narrow, RP235x use?

The GBSCSI Common Platform - 2.5 Narrow, RP235x is built around the RP235X_60QFN, from the RP2040/RP2350 family.

How big is the GBSCSI Common Platform - 2.5 Narrow, RP235x PCB?

The GBSCSI Common Platform - 2.5 Narrow, RP235x measures 53 × 31 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the GBSCSI Common Platform - 2.5 Narrow, RP235x?

86 components, from 32 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 GBSCSI Common Platform - 2.5 Narrow, RP235x design files?

From the GeorgeRudolf/GBSCSI2 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 GBSCSI Common Platform - 2.5 Narrow, RP235x design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which GeorgeRudolf chose for the repository.

Can I test firmware for the GBSCSI Common Platform - 2.5 Narrow, RP235x without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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