6502.org

Those look terrific!

Here are some other possibilities. This stuff is hard to shop for, I've found, due to the very large number of more or less similar products. If you're browsing the Digikey site a good place to start is here:

> Product Index

• > Connectors, Interconnects
  • > Rectangular Connectors - Headers, Specialty Pin

You'll see there are half a dozen pin styles that could be creatively adapted to our purpose. Below I've shown two of the most obvious choices -- the so-called "fork" and "post" style pins. AFAICT the prices and availability are not especially good. But Aries is hardly the only supplier for products with the fork style pins. It seems plausible you might find a bargain on these, particularly if you shop for the (rather common) 14- and 16-pin sizes. Ultimately you'd discard the plastic part and only use the actual pins, but the plastic part might be quite handy to keep the pins aligned during soldering.

Clearly, the "post" style of pin will work for through-hole mounting. But the "fork" style might actually be better for surface mount. (First you'd manually put a 90-degree bend in the two tines of the fork. For best results build a little jig.) Hmmm, if you bent (or cut) only one tine then maybe the result would work well for through-hole...

Other creative solutions exist, as I said. The Digikey link shows some other variations that seemingly might suit surface-mount.

-- Jeff

Those appear to be the best so far. 20 pins is fine, since a 40-pin DIP has 20 pins down each side. Otherwise, they are end-to-end stackable anyway. Hopefully shipping won't make them exceed $4 per module. I would prefer it to be under $2 (5¢ per pin), but maybe it's just not possible. I haven't gotten a price on the Interplex parts yet, but all the other alternatives have one or more of these disadvantages:

• $5 to $15 per module, just for the pins! (Even 40-pin DIP headers are nearly $6 now, plus shipping.)
• too labor-intensive to mount (Labor-intensiveness is ok if I'm just making one or two, but not if I'm going to supply them for everyone who wants to buy.)
• will damage IC sockets (Several potential buyers have expressed interest in plugging one into their existing '02 computer, and will probably want to leave the possibility of putting the '02 back in later. Cheap .025" square posts may stretch out the socket contacts so they'll no longer make solid contact on a normal IC.)

I think DIP headers (if they can be found inexpensively enough) could be surface-mounted, without bending or cutting tines, and it should be plenty strong if the PCB has holes under the tines, so there would be not only a good solder fillet but the copper and the solder under the tines would also reach into the holes for a better grip on the board. The holes would be smaller than the tines. Without the holes, I've seen too many cases of foils pulled away from the board and cracked when connectors were strictly surface-mounted in consumer electronics. Anything that handles some strain needs to be anchored into thru-plated holes in the board.

Ah yes, of course. I was a bit brief in reading the website, except for the technical details about how and why. I then lost interest because shipping is prohibitive out of USA, but I figured it could still be interesting for you local guys.

Look what came in the mail today from WDC! 816's in PQFP!
They say they expect Mouser to have them in the next week.

For once it's a good thing I procrastinated!

They exist!!!

Of course, there's no way I'll ever be able to solder one to a PCB.

Excellent. I've been waiting for those, to put on this :

http://www.zeridajh.org/hardware/reco6502mini/index.htm

The PCB is ready for it. I designed it to take W65C02 as well as W65C816 (if it was ever produced). I just hope it doesn't have a 'surprising' pinout (compared to the QFP W65C02) ...

Will you put more than 64k RAM in the '816 model, John? Could be interesting...

From experience with its predecessor ReCo6502, few people are interested in more memory (or the 816, really). In any way, the ReCo6502Mini PCB takes 2 * 32 KB, and although I have plenty of bigger parts (in bulk), I don't think I fancy making a new PCB, so that's that for the memory size.

Fair enough!

Those are neat!

Looks like I have to change my next layout!

Bought a few W65C816S6TQG-14s, placed one on my little project, and working fine at 20 MHz (and 3.3 V)

So it will probably do 24+ MHz like the W65C02, but that needs some further experimentation (no PLLs on board ...).

Yep. 24 MHz : pass (with soak test). Like the W65C02, not bad for a 14 MHz rated chip at 3V3.

A2Heaven is selling what seems to be the same thing as Daryl's '816-to'02 module. See http://www.a2heaven.com/webshop/index.p ... uct_id=151 . Thanks to rwiker for pointing that out.