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Openscex carrier

gufranco·openscex-modchip·hardware/openscex-carrier.kicad_pcb

Openscex carrier PCB layout, top view — open source AVR/Arduino board by gufranco

About the Openscex carrier PCB

Openscex carrier is an open source AVR/Arduino PCB design by gufranco, published on GitHub under the MIT license. It is a 2-layer board measuring 35.6 × 43.1 mm, with 14 components from 12 distinct parts.

Its main chip is the ATTINY85-20PU, from the AVR/Arduino family. By type, the board carries 5 resistors, 2 diodes, 2 capacitors, 1 IC, 1 transistor and 1 connector.

It belongs with the retro computing designs in this gallery.

From the project

Stealth SCEx region-unlock modchip firmware for PlayStation and PSone on an ATtiny84: console-clocked, lid-sensed disc swaps, one region per build, MISRA C:2012 clean, fully tested logic

5720 bytes of flash · 8 board families, PU-7 to PM-41(2) · 3 regions · 0 MISRA deviations · 100% host line and branch coverage · 206/206 mutants killed

Region-unlock firmware for the original Sony PlayStation (fat) and PSone, on an ATtiny85 running from its internal oscillator, which it trims against the console's own SUBQ frame rate. It emits the configured region string inside the SUBQ region-check window, stops the moment the console accepts it, and leaves the data line high-impedance during play. It needs no lid wire: it knows a disc was swapped when SUBQ goes quiet while the drive is…

Openscex carrier, from the project README
From the project README

Main components on the Openscex carrier

ATTINY85-20PU

Openscex carrier bill of materials (BOM)

14 components, 12 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY85-20PU
ATtiny85-20PU
U1
1
2N3904
Q1
1
ISP
J1
1
CMI-1295IC-0385T
BZ1
1
CTS 206-2ST
SW1
1
LED red 3 mm
D1
1
1N4148
D2
1
100NF
100nF
C1
1
100uF 10V
C2
2
1k
R1, R2
2
10K
10k
R3, R5
1
10
R4

Openscex carrier design files

The KiCad project lives in the gufranco/openscex-modchip repository on GitHub; these links point at the commit this page was built from.

Openscex carrier: common questions

What microcontroller does the Openscex carrier use?

The Openscex carrier is built around the ATTINY85-20PU, from the AVR/Arduino family.

How big is the Openscex carrier PCB?

The Openscex carrier measures 35.6 × 43.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Openscex carrier?

14 components, from 12 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 Openscex carrier design files?

From the gufranco/openscex-modchip 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 Openscex carrier design in my own project?

Yes, under the terms of its MIT license, which gufranco chose for the repository.

Can I test firmware for the Openscex carrier without the hardware?

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

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