Where to get PCBs printed ?

[BigDumbDinosaur]

BTW, in the above image, red is the top layer and green is the bottom.

[airship]

BDD, did you look at Brain's 'flippy' board referenced above? Could you make your breadboard dual-ended for the expansion and user ports like that? I think that's a really cool idea.

IMHO, the expansion port end probably doesn't need fingers that are as long as those on Jim's board, as you'd be soldering a connector to them, anyway.

[BigDumbDinosaur]

BDD, did you look at Brain's 'flippy' board referenced above? Could you make your breadboard dual-ended for the expansion and user ports like that? I think that's a really cool idea.

I could but probably won't.  I'm a long-time believer in designing electronics to do one thing very well rather than several things poorly.  The C-128 is an electrically noisy system (very noisy) and keeping the expansion port board as compact as possible reduces problems caused by noise, both from internal sources and from the surrounding area.  It's my opinion that combining two unrelated functions into the same board is not good.  Of course, that's just an opinion.

BTW, the above layout was planned so I could play around with SCSI ASICs connected to the expansion port.  That was why I didn't add Vcc and ground buses.  In the latest incarnation I added ground (bottom row) and Vcc (top row) buses.  All holes are on a 2.54 mm grid.

[airship]

In the latest incarnation I added ground (bottom row) and Vcc (top row) buses.  All holes are on a 2.54 mm grid.

Cool. How many would you need to order? How much?

[BigDumbDinosaur]

Cool. How many would you need to order?  How much?

For you, such a deal!

Seriously, I can have any quantity produced, but as you might expect, the per board cost is better at larger quantities.  For example, if I have 20 made (anything less is uneconomical) it works out to about 19.50 USD per board.  At a quantity of 50, the per board cost is about 11.00 USD.  At 100 boards, we're down to about 8.50 USD.  These boards, of course, will have solder masks and will be silk screened, as shown in the above image.  Naturally, some cost will also be incurred in shipping.

[airship]

Sounds like I could buy one if you order 20, two if you get 50, and three if you can buy 100. Are you noticing a pattern here?

[airship]

Wouldn't these work for the expansion buss? http://www.vectorelect.com/Product/Plugbord/PB44C.htm

I have no idea how much they would cost.

[hydrophilic]

Wow they even have a reasonable selection!  Anyway for $11(q50) or less, I'd get at least 3.  At $19.50(q20) I don't think I'd be interested... I might be persuaded to buy 1 if it would help.  I don't like having 1 of an experimental object because they tend to break during experiments! 

You know, that's probably why I like programming so much; no matter how bad you mess it up, it's unlikely you'll break anything.  I believe this is more true on a Commodore than a modern OS (what a nightmare if you foul up the Win registry).  That must be a main reason I love Commodores.  Never occured to me before... how enlightening!

[BigDumbDinosaur]

Wouldn't these work for the expansion buss? http://www.vectorelect.com/Product/Plugbord/PB44C.htm

I have no idea how much they would cost.

Go back and take another look.  I quote from the site:

Contacts:  22/44 @ 0.156" Centers Ni / Gold

If you can figure out how to plug 'em into the expansion port receptacle you're a better man than I am.  Even a big hammer won't make them fit.   :laugh:

[airship]

This is why I always ask. There's always someone smarter than me on here who can tell me what's really going on.