I moved it from stripboard to a PCB recently, but not blogged about it for a while, so here are some words for anyone who may be interested:

https://projects.drogon.net/ruby-on-pcb ... -software/

Photo:



My launch-page for the project is here: https://projects.drogon.net/6502-ruby/ although it's a bit long-winded...

Cheers,

-Gordon

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Gordon Henderson.
See my Ruby 6502 and 65816 SBC projects here: https://projects.drogon.net/ruby/

Nice project and nice write up on the link provided. Oddly, I would have put a second socket on the PCB for the second SRAM, as you certainly have ample room. I've piggy-backed chips and sockets in the past for specific needs, but prefer a "more pure" implementation when doing a PCB, but it's more personal choice. Any future plans to share source code or schematics?

Cheers

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Regards, KM
https://github.com/floobydust

I respectfully second the motion for source code sharing, especially of your Woz-inspired monitor.

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Got a kilobyte lying fallow in your 65xx's memory map? Sprinkle some VTL02C on it and see how it grows on you!

Mike B. (about me) (learning how to github)

Thanks for the feedback.

My ultimate aim is for a 65C816 system, so the breadboard -> stripboard -> PCB in the 65C02 versions are stepping stones on the way - so e.g. the piggy-backed SRAM was simply there because I used it on the stripboard version. I've another PCB revision to go to get to the 65C816 version with 512KB or 1MB of RAM - todays issue is that the largest through-hole SRAM is only 512KB (and the ones I can find won't be good for over 8Mhz either) so I'm considering some Garth modules for that, although importing from the US to the UK is £LoL in import duties right now.

As for open source - yes - I plan to publish almost all of it - there is a library running in the ATmega (a real-time task scheduler and my own implementation of 'wiring') which I use in my commercial projects and I may publish that as a library to link in with the rest of the stuff that handles the 6502 side, although I'm not quite sure yet. It's a "classic" project with many source files and a Makefile, and while clients always get full sources my (internal) debate is all about support as it's not a setup that traditional Arduino people would understand and trying to support the Raspberry Pi stuff I've done and published is somewhat time consuming.

The 6502 side won't be an issue.

The woz-mon like thing has now mutated into an Acorn MOS like thing though - there's little of the original left although I could publish the old code, there's really nothing in it that isn't in any other wozmon like thing. The design of the OS is such that to adapt it to a "classic" SBC system with a UART would be relatively simple - although building it relies on Linux, make and ca65. I can't even write to RAM with it now, although I retained a memory dump command.

Bonus picture today: I left it running mandelbrot overnight, although it "only" takes 85 minutes to generate a 640x480 pixel image at a colour depth of 16...



That's the same BASIC program I posted a few days back using the standard BBC Basic GCOL and PLOT 69,x,y commands.

Cheers,

-Gordon

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Gordon Henderson.
See my Ruby 6502 and 65816 SBC projects here: https://projects.drogon.net/ruby/

Very cool!
Brad

Just a brief note - after I posted a software question last night - my 6502 system is now a 65C816 system as an interim step to making a "full" 816 system (ie, with more than 64K of RAM)

The executive summary is: It just works. One resistor change so any reasonably new 65C02 system should be able to take an '816 with relative ease.

https://projects.drogon.net/ruby-6502-b ... uby-65816/

Cheers,

-Gordon

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Gordon Henderson.
See my Ruby 6502 and 65816 SBC projects here: https://projects.drogon.net/ruby/

Very good!

You will already have seen this thread, but it might be useful to future travellers on this road:

On the usefulness of 65816 as a 65C02 alternative

Yes, thanks. There's loads of stuff here (mostly here!) and I did go through a lot of it a year ago when I first started out on this project - with the initial idea of making an '816 system, but went for the 6502 system in the first instance.

This: http://6502.org/tutorials/65c816opcodes.html#APPENDIX: has also been a good read too - more so in light of the issues I've had (foolishly) trying to make some legacy code work in native 816 mode...

Does anyone keep a full archive of here? It's too valuable to lose ...

Cheers,

-Gordon

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Gordon Henderson.
See my Ruby 6502 and 65816 SBC projects here: https://projects.drogon.net/ruby/

Mike has full backups and a succession plan for his executors, I believe. Not sure if anyone has made a freelance archive. The static content of the site is on github (mostly??).