I just ordered some of those dip connectors myself, so we'll both find out about the same time if my deductions hold water! -- bkw
On Mon, Oct 16, 2017 at 10:06 PM, Randall Kindig <[email protected]> wrote: > Brian, thanks so much for the detailed information! > > Randy > > On Oct 16, 2017, at 10:00 PM, Brian White <[email protected]> wrote: > > Well since no one answered any better, what I gather from the various > manuals available on-line, my own dvi which came with a hand-made cable for > Tandy102, and pictures of another hand made cable for 102 on ebay once a > couple years ago... > (I don't have a cable for Model 100, and have not yet actually built and > tested this for Model 100) > > Parts (For Model 100 or 200, but not 102): > * One 40pin dip idc connector like this: > http://www.king-cart.com/cgi-bin/cart.cgi?store=phoenixent&p > roduct_name=HWS15322 > or > http://www.ebay.com/itm/162482138557 > > * One regular 40pin female idc connector, with polarity notch and > strain-relief > http://www.king-cart.com/phoenixent/product_name=HWS1877 > > * 20 inches of 40pin ribbon cable. > > Assembly: > * Crimp the cable in the dip connector such that if you are looking at the > dip connector with the #1 pin top-left and pins pointing away from you, the > cable exits to the right, red stripe on top. > > This last part I'm not 100% sure about for Model 100 only because I > haven't actually tried it. > For a 102, I do know you have to take one end of the cable (doesn't matter > which), and peel the conductors apart into 20 pairs, and flip each pair > over before crimping the idc connector together. > For a 100 or 200, I think you just run the cable straight through. > > The dip idc connector that goes in the 100 does not connect pin X to the > same conductor Y as regular idc connectors. > A regular idc connector connects pin 1 of the connector to conductor 1, > and pin 40 to conductor 2. > The dip idc connector reverses that. Pin 1 goes to conductor 2, pin 4 goes > to conductor 1. > I think the only reason you have to swap pairs over on a Model 102 cable > is because they designed the pinout in the DVI so that a simple straight > cable would work to a model 100 (same way they did for the printer port on > the m100), and so to connect a 102, you have to artficially mimic the > flipped pinout of the dip connector. Reference, "Style 2" from this drawing: > https://media.digikey.com/Renders/Assmann%20Renders/ > partnumber%20breakdown%20Assmann.jpg > "pin #1 on connector is connected to 2nd conductor on cable" > > I mean, I know for sure what a regular idc connector does, and what these > dip idc connectors do, and what a working cable for a 102 looks like, and > so from those I am deducing what the 100 cable must be. > > * Arrange the cable on the 40 pin idc female connector such that the end > of the cable ends on the side of the connector with the polarity notch, and > the cable extends away from the connector on the side opposite the polarity > notch. Crimp the cable. Then fold the cable back over the top to snap on > the strain relief clip. Now the cable is going the same direction as the > key notch. > > References: > * http://tandy.wiki/Disk/Video_Interface > o Pictures of ebay cable, the original ad sold it as a T102 dvi cable. > My own t102 cable is made a different way, but wired the same. > o User manual page 9 (pdf page 13) > o Service Manual figure B-1 system bus pinout > * ftp://ftp.whtech.com/club100/doc/m100ServiceManual.pdf > o figure 4-3 system bus pinout > * https://www.digikey.com/product-detail/en/assmann-wsw- > components/H0PPH-1006G/H0PPH-1006G-ND/1000156 > > -- > bkw > > On Sun, Oct 15, 2017 at 11:23 PM, Randall Kindig <[email protected] > > wrote: > >> Does anyone have a cable for connecting the M100 to the DVI box (for >> composite monitor hook-up and disk drives)? >> >> Does anyone have information for making one? I know that Ian Mavric was >> looking into making a cable for this great M100 accessory, but I thought I >> would ask the list. >> >> thanks >> >> Randy >> >> >> > >
