Re: Create ULA for €5?
Posted: Fri May 12, 2017 11:43 pm
So who is good at eagle or KiCad?
Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones...
https://sinclairzxworld.com/
I finnished my etching this weekend, and it was a mess, and with a useless result.PokeMon wrote: ↑Thu May 11, 2017 11:19 pmIt depends on how much money you want to invest in your projects or hobby. This is a value of a small evening dinner only. And you have to buy copper boards and chemicals as well and maybe need a few attempts to get a suitable result. So it is simply a matter of choice I would say.
This is a schematic used to drive the Xilinx tools, it's not for PCB design. ISE can be driven using text files in a number of hardware description languages or by using a more literal description of the circuit schematic as it appears to be in this case.Tezz wrote: ↑Mon May 15, 2017 10:56 am I thought I'd start learning to use Eagle which I've just installed. RetroTechie posted the zip file "ZX81_ULA-in-a-CPLD_v1.10.zip" here: viewtopic.php?f=8&t=1862&start=12 which includes .sch files for each of the schematics. Are they from an earlier version of Eagle? They won't load in the latest version.
Ah! thanks.
Thanks for your encouragement and link to the article. I'll let it be for now, and try with smaller pcb.1024MAK wrote: ↑Mon May 15, 2017 10:28 pmI don't know if you have seen this article and the follow ups. Lots of help and advice.
And yes, it is the way of the world for your first, and maybe 2nd, 3rd attempts to fail for some reason.
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So keep going
Thats how my prototype looks like. The Programming pins will not be soldered in a future version and the Quartz needs to be SMD type, but otherwise you can get the Idea of it I hope.