for what it is worth, I seem to recall being able to use a standard IDE HDD cable, with a long pin header for T102 <--> DVI. maybe I recall incorrectly though.
On Tue, Oct 24, 2017 at 9:07 AM, Brian White <[email protected]> wrote: > > My new cable is like you say on the right. > > ---- > > For instance: > > * The Model 100 tech ref > http://www.classiccmp.org/cini/pdf/Tandy/Model%20100% > 20Tech%20Reference.pdf > page 28 > (also the service manual > http://www.classiccmp.org/cini/pdf/Tandy/Model%20100% > 20Service%20Manual%20(Final).pdf > page 35) > > Says AD0 is pin 3 on the 100 > > * The DVI service manual > http://www.classiccmp.org/cini/pdf/Tandy/Disk%20Video% > 20Interface%20Service%20Manual.pdf > page 70 > > Says AD0 is pin 6 on the DVI > > ---- > > Similarly, I've now built a T102 cable with the twists. > https://photos.google.com/share/AF1QipMkzQNqSYNaG6XGROBssfEmXJ5kj3-Kv- > gOHMuqPQJdSUloL8ZpSs83D-tcocw8jA?key=ZzRJQnlPVXlsRVZJVGE1ZXlKdkpoYn > lvTUh0NjhB > > * The T102 tech ref > http://www.classiccmp.org/cini/pdf/Tandy/Model%20102% > 20Tech%20Reference.pdf > page 20 > > Says AD0 is pin 5 on the 102 > > And sure enough, this cable constructed this way, pin 5 on the T102 end > goes to pin 6 on the DVI end. > > This cable visually matches up with the old ebay one too, which we can > only assume was good. > (I didn't buy this cabel, just downloaded the pics while the ad was still > up) > https://goo.gl/photos/Sm8xx3Ys2vJwpQYu7 > > ---- > > To me this corroborates the M100 cable, because it shows that both cables > deliver the same signal to the same pin at the DVI end, and I think there > is no argument about how to make a T102 cable, and this T102 cable also > appears to agree with the tech references. Everything is consistent with > everything else. > > This also reasserts my initial idea that they designed the DVI pinout > specifically to accommodate the fact that the DIP connector connects > pins-to-wires in a different pattern than than regular IDC connectors, > specifically to allow a flat simple cable using a DIP connector like that, > and why the T102 & 200 needs twists. > > I've now tried both my M100's and my T102, and none of them are booting my > dvi, but by now, I actually think it's a problem with the dvi even though > these cables are both new and unproven. The pinouts check out with the > manuals, my new T102 cable also agrees visually with those pics from that > old ebay item for a T102 cable. I got my dvi off ebay and never saw it > actually work, nor did the seller claim it. > > -- > bkw > > > On Tue, Oct 24, 2017 at 1:00 AM, Mike Stein <[email protected]> wrote: > >> I must admit that I'm starting to get confused myself but unless I hear >> otherwise I'm going to stick with my original opinion (Oct 17) that the DIP >> pin 1 should connect to the IDC header pin 1 which would connect DIP 29 to >> header 24, not 23. Sounds like your cable connects DIP 1 to Header 2 etc. >> >> Correct ? Yours? >> > DIP IDC DIP IDC > 1 1 1 2 > 2 3 2 4 > 3 5 3 6 > 4 7 4 8 > 5 9 5 10 > 6 11 6 12 > 7 13 7 14 > 8 15 8 16 > 9 17 9 18 > 10 19 10 20 > 11 21 11 22 > 12 23 12 24 > 13 25 13 26 > 14 27 14 28 > 15 29 15 30 > 16 31 16 32 > 17 33 17 34 > 18 35 18 36 > 19 37 19 38 > 20 39 20 40 > 21 40 21 39 > 22 38 22 37 > 23 36 23 35 > 24 34 24 33 > 25 32 25 31 > 26 30 26 29 > 27 28 27 27 > 28 26 28 25 > 29 24 29 23 > 30 22 30 21 > 31 20 31 19 > 32 18 32 17 > 33 16 33 15 > 34 14 34 13 > 35 12 35 11 > 36 10 36 9 > 37 8 37 7 > 38 6 38 5 > 39 4 39 3 > 40 2 40 1 > > >
