Note: This is the develop branch, where the latest development files live. It is not guaranteed to contain stable code or working designs at any given point. If you are looking for code to use with your board or stable designs, these can be found on the current 1.2 release branch for revision 1.2 boards, or the current 1.1 release branch (or the 1.01 release branch if you have firmware 1.01) for revision 1 boards. Code built or PCBs manufactured from the develop branch are likely to contain development and pre-production bugs, be incomplete, or just plain not work. Code and designs here are liable to change in utterly-incompatible ways without notice!

This repository holds design files, firmware and software for the Really Old-School Computer (M68k) single-board computer, AKA the rosco_m68k. This is a fully-featured, programmable, extensible and capable 16/32-bit retro computer that is completely open source and is available in kit form (Starting April 2020).

This project contains all the design files and source code for the project. For documentation (including assembly instructions) please see https://rosco-m68k.com

You can find the project along with some logs about its development history on Hackaday: https://hackaday.io/project/164305-yet-another-m68k-homebrew

• All Software released under the MIT licence. See LICENSE for details.
• All Hardware released under the CERN Open Hardware licence.See LICENCE.hardware.txt.
• All Documentation released under Creative Commons Attribution. See https://creativecommons.org/licenses/by/2.0/uk/
• OSHWA-certified Open Source Hardware

The hardware specifications for the rosco_m68k are:

• MC68010P10 at 10MHz, /DTACK no longer grounded but still zero-wait-state for RAM/ROM accesses.
• MC68901 MFP provides UART, Timers and Interrupt vectoring
• 1MB RAM (0x0 - 0xFFFFF)
• Up to 64KB ROM supported (at 0xFC0000, 256KB reserved for ROM up to 0xFFFFFF)
• 256KB IO space (0xF80000 - 0xFBFFFF)
• High-speed decode and glue logic handled by ATF16V8BQL PLDs.
• Comprehensive expansion and IO connectors allow the system to be easily expanded!

• A serial bootloader that can load software via the UART (with Kermit protocol)
• Lots of example code and community projects
• Rich firmware interface for with serial and video console for easy programming
• Easy68K-compatible* TRAP 15 (IO) handler
• A growing collection of system libraries and utility code
• Custom Homebrew tap with toolchain - assembly built with VASM; C/C++ built with GCC 7.5.

(*) The firmware is mostly Easy68K compatible - certain functions are not implemented due to the serial nature of IO.

The rosco_m68k is an OSHWA-certified Open Source Hardware project!

https://certification.oshwa.org/uk000006.html