2 layers177.8 × 130.8 mm
2 layers53.3 × 126.4 mm
Devcart
zuiko21/minimOS23Scalable OS for 6502/65816
- Size
- 53.3 × 126.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 48
- Pads
- 229
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 5 (file 20171130)
- Created
- 22 Dec 2015
- Updated
- 26 May 2025
Overview
Devcart 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 53.3 × 126.4 mm with 14 parts on 48 nets.
It is built around the 74HC245D, 74HC139D and 74HC157D, with the 74HC174D among its other parts. Its parts include 7 ICs and 7 connectors.
Main components
4
74HC245D
SO-20-300mil-40℃~+125℃ 1 160uA 2V~6V 7.8mA 7.8mA 74HC 8 9ns@4.5V,50pF Bidirectional Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74HC139D
SO-16-40℃~+125℃ 11ns@6.0V,50pF 160uA 2/4 2V~6V 74HC Decoder Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74HC157D
SO-16-40℃~+125℃ 10ns@6.0V,50pF 160uA 2V~6V 5.2mA 5.2mA 74HC 8/4 Multiplexer Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers
74HC174D
SOIC-16-40℃~+125℃ 1 107MHz 28ns@6V,50pF 2V~6V 3.5pF 5.2mA 5.2mA 6 74HC Series 8uA D-Type Reset Rising Edge SOIC-16 Flip Flops ROHSNexperiaFlip Flops
README
README.mdThis 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Please note that this doc is OBSOLETE.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
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 74HC139 | Package_DIP:DIP-16_W7.62mm | U6, U7 |
| 1 | 27C512 | Socket:DIP_Socket-28_W11.9_W12.7_W15.24_W17.78_W18.5_3M_228-1277-00-0602J | U1 |
| 1 | 628128 | Package_DIP:DIP-32_W15.24mm | U2 |
| 1 | 74HC157 | Package_DIP:DIP-16_W7.62mm | U4 |
| 1 | 74HC174 | Package_DIP:DIP-16_W7.62mm | U3 |
| 1 | 74HC245 | Package_DIP:DIP-20_W7.62mm | U8 |
| 1 | AUDIO C | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J5 |
| 1 | AUDIO D | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J6 |
| 1 | AUDIO E | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J7 |
| 1 | EDGE CONNECTOR | edge_conn:Durango_ROM | J1 |
| 1 | PORT C | Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical | J2 |
| 1 | PORT D | Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical | J3 |
| 1 | PORT E | Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical | J4 |
Questions
How big is the Devcart PCB?
It measures 53.3 × 126.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Devcart use?
14 parts, built around the 74HC245D, 74HC139D, 74HC157D and 74HC174D. 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 Devcart KiCad files?
From the zuiko21/minimOS repository on GitHub, at the commit this page was made from: the board is hard/kicad/durango/cartridges/devcart/devcart.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Devcart 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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228 parts