Thanks for the heads up. Several possible approaches depending on the exact size of the through holes and the exact amount of vertical space available:
* There are somewhat more low profile insulators available, they just cost a lot more. The square pins were $.60 for one board, These round ones were $4.00 for one board, Other pins are up over $15.00 for one board, getting kind of crazy at that point, but, might still be practical for individuals to each do one-offs with minimal special tools or custom jigs. Maybe some special part number is out there that works without much hacking needed. * If the lowest profile insulators & shoulders are still too tall, some pin models have shoulders that make it easy to solder the pins to the board with the insulator on, and then pull the insulator off, leaving just the pins behind. * Some pins have special wider posts meant to press-fit and fill the through hole instead of wobble loose in it. * Use pins that have intentionally longer mating part than needed, and we don't care what kind of shoulders or insulators or soldering posts they have, just drop the extra long mating surface down through the through hole from the top, with the entire insulator and shoulder above the board, solder in place, and use flush/angle nippers to cut the pins off on top. * Change the drill size in the drawing smaller to exactly accommodate a pin diameter, or wider to match a shoulder diameter, so that it fits snugly instead of loosely with the insulator pulled off. I will consider all these and more possible ideas when I actually get the things in my hands. I'm not too worried that there is *some* form of practical, reproducible answer. -- bkw On Tue, Oct 17, 2017 at 6:01 PM, Stephen Adolph <[email protected]> wrote: > Hi, > the bom looks fine however > 1) didn't check the chip in detail > 2) the pins look ok but be advised that due to the low height > restrictions in the T200, the pins have to be each removed from the plastic > header and individually inserted into the PCB and soldered in place. this > is tricky to do and I have a jig that makes it easy to keep the pins in the > right place while they are soldered. otherwise they go off angle and are > then impossible to place in the socket later. > > I did this manual step because I could not find better pins. Maybe someone > out there can find appropriate pins that avoid the manual work. > > Steve > > > On Tue, Oct 17, 2017 at 2:14 PM, Brian White <[email protected]> wrote: > >> Ok bom cart updated. >> http://tandy.wiki/Model_200_RAM >> >> Now we just wait to see if I correctly ticked all the boxes to find a >> compatible ram chip. >> >> >> On Tue, Oct 17, 2017 at 8:04 AM, Stephen Adolph <[email protected]> >> wrote: >> >>> Hi Brian, >>> Yes, that board provides 48K of RAM. >>> The pins have to be round in order to fit the socket, or the could be >>> thin like IC pins. But square won't engage the socket properly.. >>> Steve >>> >>> >>> On Tue, Oct 17, 2017 at 7:19 AM, Brian White <[email protected]> wrote: >>> >>>> I made a tentative digikey cart. >>>> http://tandy.wiki/Model_200_RAM >>>> >>>> The ram obviously needs verification, but I'm not 100% about the pins >>>> either. >>>> I just ordered the parts so I should have the items verified in a >>>> couple weeks. >>>> >>>> Was I correct in saying that you empty both ram sockets to install this >>>> board? >>>> >>>> >>>> On Wed, Sep 27, 2017 at 4:56 PM, Stephen Adolph <[email protected]> >>>> wrote: >>>> >>>>> https://oshpark.com/shared_projects/xdmekBsD >>>>> >>>>> here is the PCB, pretty straightforward. >>>>> Docs specific to this module could be created at the wiki as people >>>>> build it and share their experiences. >>>>> >>>>> >>>>> >>>>> On Tue, Sep 26, 2017 at 12:46 PM, <[email protected]> wrote: >>>>> >>>>>> Looking forward to it! >>>>>> >>>>>> >>>>>> On 9/26/2017 12:45 PM, Stephen Adolph wrote: >>>>>> >>>>>> When I can, I will release the "T200 dual RAM module" PCB at >>>>>> Oshpark. Seems like a good idea. >>>>>> >>>>>> This will mean that people can build their own. >>>>>> >>>>>> Steve >>>>>> >>>>>> >>>>>> On Tue, Sep 26, 2017 at 12:30 PM, Jim Anderson <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> > -----Original Message----- >>>>>>> > >>>>>>> > For those in need of memory for their Tandy 200 >>>>>>> >>>>>>> Awesome, mine arrives in the mail today (allegedly) so I get to find >>>>>>> out whether I need some... and if so, then try to convince the seller to >>>>>>> ship to canada >>>>>>> >>>>>> >>>>>> >>>>>> >>>>> >>>> -- >>>> bkw >>>> >>> >>> >> >
