I tend to use the FTDI SIL interface for power and comms, but I still manage to get TX and RX the wrong way round half the time. MOSI and MISO at least give a hint as to direction, right up until it's not obvious which is master...

Neil

I put the VIA onto it - complete with a bodge wire for the VIAs select signal which I forgot to route - doh!

Built up a board of lights (18 LEDs) on some stripboard and its working well:



and if I have time then later today I'll write some code for it to make some patterns...

Cheers,

-Gordon

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

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

I use a program called Fritzing for schematic capture and PCB layout. One of it's features is that it allows me to design a PCB shape using Inkscape - so that's how I can do cut-outs and isolation slots for high voltage stuff, etc. or PCBs shaped like trees and it's and how I did the final PCBs for the Ruby816 project with their opposite rounded corners..

However, for this, Fritzing has a pre-made shape with rounded corners and I just specify the X & Y size - 90x100mm in this case and it does it for me. It has many pre-made shapes for things like Arduino shields, Raspberry Pi HATs and so on.

And while I use Fritzing, I really don't recommend it. I'm only using it now as I've used it for the past 14 years-ish.

-Gordon

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

I have a question, too, please. What does the 74xx573 LE (Latch Enable) signal look like? Is it an active-high pulse qualified by the clock?

TIA. Happy Holidays. Mike

Essentially yes.

It's a transparent latch and I used them as I had a few when I considered using them in my '816 project otherwise I might have used something else. (And because I had a few I'd already used them some years back in my original 6502 project, so knew they'd work)

Here is the logic in the GAL:



latchOut is the address ($00F8)

-Gordon

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

Finally gotten round to writing some code for it: Trivially animated tree (aka. Festering, Festive Blinkenlights)

https://unicorn.drogon.net/6507-tree.mp4

Non Youtube video link... Enjoy..

I've arranged that to auto-start and powered it off a USB power bank thing. Lets hang it on the tree and see how long it lasts!

I was going to implement a 'wiring' interface directly in TinyBasic (pin based, digitalRead, digitalWrite, etc.) but really no more room in the 4KB ROM, so sort of did it in Basic..

I won't subject you to the whole horrors of it all, but the active part of the program running those lights is this:



Happy festivities.

Cheers,

-Gordon

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