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2 layers88.9 × 38.1 mmPendrive, the printed circuit board in 3D

Scalable OS for 6502/65816

Size
88.9 × 38.1 mm
Copper layers
2
Thickness
1.6 mm
Parts
10
Nets
36
Pads
106
Tracks, vias
263, 9
Pours
2
Routed
Yes
KiCad
KiCad 5 (file 20171130)
Created
22 Dec 2015
Updated
26 May 2025

Overview

Pendrive is an open-source printed circuit board by zuiko21, from the zuiko21/minimOS repository on GitHub, published under the MIT licence. It is a 2-layer board of 88.9 × 38.1 mm with 10 parts on 36 nets, routed with 263 tracks and 9 vias.

It is built around the 74HC574D, 74HC138 and BAT43, with the CR2032 among its other parts. Its parts include 4 ICs, 1 resistor, 1 diode and 1 connector.

Main components

4

README

README.md

This project is under the MIT License, see LICENSE for details.

minimOS

Please note that this doc is OBSOLETE. Read about updated details in the new architecture.md file.

Minimalistic, portable, scalable Operating System for everything from embedded devices to (quasi) full-featured desktop computers!

Purpose

Currently in a VERY early development stage, hopefully will become a common reference platform for deployment of computer-related appliances -- think about embedded systems, like the original intent: an Actual Exposure Time Meter for classic photographic cameras. But by virtue of its modularity and scalability would equally serve to a whole breed of home-made, retro-inspided computers.

Future ports

Initial target is the venerable 65(C)02 and its big brother, the 16-bit enabled 65816 (port known as minimos·16) which will keep compatibility with existing '02 code. But other ports to many CPU architectures are in mind, like the Motorola 68xx / Hitachi 63xx series (minimOS·63, with the interesting 6809/6309 branch as minimOS·69), 680x0 (minimOS·68), 8080/8085/Z80 (minimOS·80), even (God forbid! :-) the commonly used x86 (minimOS·86). I really have little-to-no knowledge about this CPU family, nor about the usual IBM-based PC architecture; hopefully someone will be able to port minimOS without too much of a chore, that would give a very interesting 'breath' to (otherwise useless) older PCs.

Supported architectures

This section has been moved to the hardware section

Parts

10
QtyValueFootprintReferences
274HC574Package_DIP:DIP-20_W7.62mm_SocketU3, U4
147KResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_HorizontalR1
162256Package_DIP:DIP-28_W15.24mm_SocketU1
174HC138Package_DIP:DIP-16_W7.62mm_SocketU2
1BAT43Diode_THT:D_DO-35_SOD27_P10.16mm_HorizontalD1
1CR2032Battery:BatteryHolder_Keystone_103_1x20mmBT1
1IOxConnector_PinSocket_2.54mm:PinSocket_2x08_P2.54mm_HorizontalJ1
1Logo_Open_Hardware_LargeSymbol:OSHW-Logo_19x20mm_SilkScreenLOGO2
1Logo_Open_Hardware_Smalldurango:jaqueriaLOGO1

Questions

How big is the Pendrive PCB?

It measures 88.9 × 38.1 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Pendrive use?

10 parts, built around the 74HC574D, 74HC138, BAT43 and CR2032. 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 Pendrive KiCad files?

From the zuiko21/minimOS repository on GitHub, at the commit this page was made from: the board is hard/kicad/pendrive/pendrive.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Pendrive design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

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