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Only had a few minutes, but I put the power/serial USB jack on; needs a pile of solder, takes a fair amount of force when putting in/out the cable! .. and FTDI and VGA jack, and the damned thing comes up when the boards are put together. I gotta say .. dorky as it is, it looks pretty sweet :)...

To be fair, I'm actually going to drive the USB from the stm32 "GPU" these days, which is cheating (recall the Zikzak has fairly strict rules about non-cheating, otherwise ther whole thign just turns into a SoC single chip machine.) .. but USB is not a priority whatsoever, so I took out the...

I've only had a few minutes to eyeball it, but I'm pretty happy so far. The jacks seem to all fit into their respective holes (huge win imho ;), so its really s question of did I wire it all up correctly, and map the pads to schematic elements correctly, and all that. Will find out 'soon' ...

*Elecrow win* .. pcbs are made, and already on their way to me, supposed to arrive Tuesday. Now _thats service_! jeff

Ahright, after a very fast route job (it takes a fair amount of work to weave every little trace around in a basketweave .. I worked hard at it, but not slowly thats for sure ;) .. but it passes all the ERC (electrical rules checks) and DRCs (Design Rule Checks, the physical spacing between...

For those keeping track.. Image of the layout so far; the big gaping hole in the middle/bottom is just for airflow, and as space where the cart passes through into the Zikzak r3 pcb below And a lame photo of a printout of the pads, with connectors laid about; thats just to ensure there is...

wow .. I'd forgotten that existed. The transparent green? I think white is nicer looking than the green, but exclusive club or what :) jeff GP32 is still a really cool obscure machine. *heart forever*

Stacked up a couple pcbs with the long header pins I intend to use for bridging the two boards .. plenty of clearance, like a full inch; should be no problem reaching the ZDI and JTAG out the back, without milling any extra clearance holes in. Given that, the whole back of the shield can be...

I've waffled on that very point many times; if you read the whole thread, I'm sure you'd see a pattern of indecision.. one big board! a separate gpu board, cpu board, power board, I/O board! No, how about a power and amp board, and cpu+gpu board! ... etc :) Theres convenience vs cost vs...

As expected, its challenging in the placement sense, to make the shield. I've not even started worrying about placement, relative to putting on a 3d printer case yet, but just trying to place things 'at all' Will post a screenshot of the CAD pcb layout so far when I get a moment (I post these...

FWIW.. did a quickish test tonight. One of my little test PCBs is 'Zok' (Zik, Zok, you got it.) .. the Zok is just a handy little prototyping board for atmega644 (or similar) .. one of my preferred mcu's for hacking around. Essentially, Zok is compatable to an arduino, but its my own design...

yeah the FTDI chip is great; its what made arduino popular .. arduino is really just atmega + ftdi + bootloader, and some software.., plus the passives. Having USB to flash or serial log is insanely handy, and it does the 3.3V rail for you. And due to arduino popularity, those chips are crazy...

Brainstorm in a moment of free time. So ZZ r3 pcb just has a power-header (for input) and it replicates them to a bunch of header pins on out-side (for jumping over to things like to GND out a pin, or pull up a pin, etc. They're just handy to chain, so I have output voltage pins) So, the way I...

<brain dump mode> Didn't work it out yet, and as it seemed a non-useufl extra block, haven't pursued it. I don't have a handy TRRS male on my benchtop, but maybe those are longer and protrude into the 6p block; or perhaps theres some custom connector that goes in there, or something. No idea...

Stupid little things, but here you go.. I have 10 headphone jacks (female pcb side); unknown pinout to start with. Had them lieing around for 3 years or so, random vendor. Audio has always been my weak side, so I don't know a lot, or any of the standards, etc. I do know all you need is gnd and...

(carrying on from other thread) rygD .. I've probably got 8 or 9 of the ZZ r3 bare pcbs around, and a few of each of the components (ie: cart edge connector, resistors, stm32, ez80, etc.) The ez80 and stm32 are tricky to solder (surface mount, high density) so I could solder those for you...

The reason for the barrel jack, was so I could take in random power (say, 7-20V) and bring it down to the voltages I need (such as 5 and 3.3); when you do that (aside from bleeding off heat or ripple), you generally get a pretty consistent voltage out. If you just assume the input is 5V, that...

okay, as noted in the C64 thread, I've been working on and off on Zikzak ("ZZ") again; the last couple years continue to limit free time (kids will do that, and work laying people off, moving people around, being bought, etc and so on..), but I'm still hacking. Born to hack :) The last real ZZ...

I have a model? yay :) Well, I've made one so far :) (well, okay, not counting the veritable mountain of prior revisions and experiments, and things that turned into 3d printers, cars, tricopters, mod players and quadcopters). There is at least a couple people showing up again here in the...

Theres a lot of these little projects around; like, at least 10 or 20 of them :) Way off topic, sorry, but I'll blabber on anyway :) The uzebox is more similar to where I was going, though its composite out IIRC; to be useful nowadays, you pretty much have to be VGA (and even then, its on its...