Disk/Video Interface: Difference between revisions
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[https://photos.app.goo.gl/DP01aAsCh7OgFULV2 More Pictures] | [https://photos.app.goo.gl/DP01aAsCh7OgFULV2 More Pictures] | ||
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*This pinout flatly violates the pinout written in the Service Manual for the DVI! | |||
At least two different people so far have provided solid info that their actual working cables are wired this way. See the example from Ted Saari below, and Mike Stein has asserted the same thing on the m100 mail list. So... Either the Model 100 tech ref is wrong or the dvi service manual is wrong. I'm going to say that it's far more likely for the DVI service manual to be wrong and go unnoticed than the several Model 100 references. | |||
*Some DIP IDC connectors connect pin 1 to conductor 1, and pin 40 to conductor 2 | |||
:While some others connect pin 1 to conductor 2, and pin 40 to conductor 1. | |||
:So, you may possibly not need to swap the positions of every other wire, depending on which type of DIP connector you happen to have. | |||
Crimp-on dip40 connectors are uncommon these days, and hard to search for. So here are some more sources. | :The DIP IDC connector linked above connects pin 1 to conductor 2, and DOES need to have the conductors split into pairs and twisted. | ||
*Crimp-on dip40 connectors are uncommon these days, and hard to search for. So here are some more sources. | |||
:http://ebay.com/itm/182240437070 | :http://ebay.com/itm/182240437070 | ||
Revision as of 05:31, 27 October 2017
Manuals
Boot Disk
Boot Disk files from Steven Adolf on Club100
Cable
For Model 100
(This is still pending verification, see "Work in progress" note below)
Parts:
- 40pin DIP idc connector
- 40pin female idc connector, with polarity notch and strain-relief
- 40pin ribbon cable, 20 inches
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.
- For the DVI end of the cable...
- This assumes you ordered the actual DIP connector linked above, or have another one that connects it's pins to the conductors in the same pattern. Not all do. See note below.
- Grab the red wire and the one next to it as a single pair, and peel the pair away from the rest of the cable for about 2 to 3 inches. Repeat for the rest of wires, so the cable ends in 20 loose pairs.
- Take a sacrificial IDC connector, with strain relief clip, all snapped together but with no cable, so that the connector makes a thin open slot that's the perfect size for a cable to fit in. This will be used as a wire guide to hold all the loose pairs into their original flat ribbon cable shape so that you can crimp them all in a connector.
- Take the 1st pair of wires with the red wire, twist the pair 1/2 way, and insert it into the empty slot, right against one end of the slot, so that there is a grey wire at the edge of the slot, and the red wire is one position in from the end of the slot. Repeat the twist & insert for all the remaining pairs, until the whole cable is in the slot, but with every pair twisted.
- Crimp a new female IDC connector on the end of the cable. Make sure the triangle marker for pin-1 is on the red-stripe side of the cable. Wiggle the bundle of cables around a little to settle all those loose pairs into their proper positions before really crimping. It doesn't matter much which way the polarty notch points. There is room for the cable to fold back over the connector under the DVI if it needs to. What matters is that the pin-1 marker is on the same side of the cable as the red wire.
NOTES
- This pinout flatly violates the pinout written in the Service Manual for the DVI!
At least two different people so far have provided solid info that their actual working cables are wired this way. See the example from Ted Saari below, and Mike Stein has asserted the same thing on the m100 mail list. So... Either the Model 100 tech ref is wrong or the dvi service manual is wrong. I'm going to say that it's far more likely for the DVI service manual to be wrong and go unnoticed than the several Model 100 references.
- Some DIP IDC connectors connect pin 1 to conductor 1, and pin 40 to conductor 2
- While some others connect pin 1 to conductor 2, and pin 40 to conductor 1.
- So, you may possibly not need to swap the positions of every other wire, depending on which type of DIP connector you happen to have.
- The DIP IDC connector linked above connects pin 1 to conductor 2, and DOES need to have the conductors split into pairs and twisted.
- Crimp-on dip40 connectors are uncommon these days, and hard to search for. So here are some more sources.
Work in progress
Facebook group member Ted Saari provides the following:
- 1-20 on the DIP connect to 1-39 on the left side of the IDC.
- 21-40 on the DIP connect to 40-2 on the right side of the IDC.
- Basically the left row on the DIP match to the left row on the IDC and the same for the right side, as viewed from this picture.
For Model 102 and 200
Parts:
- 40pin male idc connector, with polarity notch
- 40pin female idc connector, with polarity notch and strain-relief
- 40pin ribbon cable, 20 inches
Assembly:
- Crimp the female connector on one end of the cable. Make sure the red wire goes on the Pin-1 marker on the connector.
- On the other end of the cable, peel apart the conductors into 20 pairs, about 2 to 3 inches long.
- Take an extra female connector with strain relief clip and snap it all together without any cable. The strain relief clip on this connector forms a slot that is exactly the right size to hold the cable.
- Take the first wire pair, with one red wire, flip it over and put it into the loose connector strain relief. Repeat for the remaining 19 pairs. In the end you should have all 40 wires in the slot, each pair flipped over on one side of the connector, and the wires all flat and lined up like a single cable on the other side or the connector.
- Crimp the male connector on these wires. Make sure the Pin 1 mark on the connector is on the red wire side of the cable.
- Pry apart the clips on the makeshift cable guide, or just break it off.
Quick-n-Dirty neat trick
Another much easier way to get the wires crossed the right way, is just join 2 ordinary female idc connectors with a straight through double ended male-male idc pin header. The arrangement of the female connectors must matter, and I assume that the rule is just match up the red stripe from both cables. Thanks Mike Stein for this trick.
Wonderful Hacks from Days Gone By
Use the cassette motor control to use both sides of a double-sided drive!