HardLabs

Openscex mini

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

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

About the Openscex mini PCB

Openscex mini 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 × 25.1 mm, with 6 components from 6 distinct parts.

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

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 mini, from the project README
From the project README

Main components on the Openscex mini

ATTINY85-20PU

Openscex mini bill of materials (BOM)

6 components, 6 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY85-20PU
ATtiny85-20PU
U1
1
ISP
J1
1
LED red 3 mm
D1
1
100NF
100nF
C1
1
1k
R1
1
10k
R2

Openscex mini 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 mini: common questions

What microcontroller does the Openscex mini use?

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

How big is the Openscex mini PCB?

The Openscex mini measures 35.6 × 25.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Openscex mini?

6 components, from 6 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 mini 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 mini 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 mini 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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