My COSMAC ELF

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A quick demo of the COSMAC ELF I built in 2013-2014. It includes 32K RAM, 32K ROM, an expansion board, and bit-banged serial. In the video I demonstrate toggle switch programming and the built-in Elf 2k monitor, with special emphasis on Forth. Honestly I think it would be wiser and easier to emulate this with an Arduino (UNO1802/Kim Uno) or a handheld device. In the future I may go through Tom Pittman's Short Course in Programming with such an emulator.

Опубликовано:

10 сен 2024

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Комментарии : 20

@joefarr3304 2 года назад

Whilst you "could" do this with software emulation, and possibly if this was going to be used by civilians then that may have been the way to go, but there is nothing more thrilling than assembling your own physical machine, playing with it, maintaining it, expanding it. Anybody these days can build a virtual gizmo, but a physical implementation requires skill and patience. And when you're done with it, you can put it in a display box and show it off to people. Well done.

@walnuthills11 2 года назад

Wow, thank you for the kind words! Indeed, exactly what I did, though today I would have built an Arduino-driven replica (UNO1802) :-)

@JoeCoolPilot 3 года назад

Thanks for sharing! Nice work

@walnuthills11 3 года назад

Thanks! You are very welcome!

@KD5NJR 4 года назад

An ELF ! Those were definitely advertised my dad’s old 73 Amateur Radio Magazine collection .

@walnuthills11 4 года назад

Now I wonder about the ham radio applications!!

@KD5NJR 4 года назад

Maybe this isn’t too far off topic , but isn’t there software for emulating Arduino on the Pc ? Would make the code -> compile -> correct -> download -> execute -> that’s not quite what I want cycle go a little faster .

@walnuthills11 4 года назад

I don't know, but probably and hopefully so!

@KD5NJR 4 года назад

Did you say an Elf Arduino Sketch ?

@walnuthills11 4 года назад

YUP, I sure did, Scott!! Look up the UNO1802.

@MrCiernioo 3 года назад

Hi! Sorry to bother you, but do you have, by any chance the ELF 2K firmware ? Link on their site is broken, and I need it for my prototype.

@walnuthills11 3 года назад

No worries! Let me check, hopefully so!!

@walnuthills11 3 года назад

Email me at molleraj at gmail dot com

@saundby 4 года назад

Now that I've had a chance to watch the video, I can say with certainty that you need to replace those toggle switches with high quality name brand switches with gold contacts. The cheap switches on the market have got crap metals on the contacts, and they're unreliable for low current CMOS input switches. Spring the $16 to $20 loose for 11 good toggle switches and a good momentary and you'll find using your Elf is a whole new experience.

@walnuthills11 4 года назад

I bet! I think these were under $1 a piece?

@Axel_Andersen 10 месяцев назад

Late to comment I know but having been there done that (Elf and stuff). Having better switches helps but actually only those signals that depend on a clean pulse need to be better. In other words those switches that set the databus can be any old crap. Further, relying on mechanical switches to produce clean pulses is looking for trouble. And indeed the originak Elf schematics has this covered, as long as the switch does not bounce between the contacts (only bounces on one contact) it should work. When I was kid an built these things those switches were together more expensive that the CPU and I could not afford them. Anyway, thanks for te videa @walnuthills11

@beforth 4 года назад

Nice project, so much fun 👍. BTW try: ' HELLO FORGET the quote ( ' ) pushes the execution token of the next word you type on the stack, maybe that's what forget needs.

@walnuthills11 4 года назад

Ah! Thanks!!