UniMac 82D Schematic or Help

[Zhinü]

I’ve got a UniMac 82D that I’m trying to turn into a Monochrome Radius Pivot cable. From what i’ve gathered, the Monochrome Radius Pivot has the sense pins of

ID1: no ground
ID2: ground
ID3: no ground

using this pinout

590-0029

However, I can’t seem to find either a way to make my UniMac 82D straight through, or set to the correct sense pins. I have a Pivot card and a Macintosh IIsi (natively supported) that I can test on with the monitor.

Does anyone have the schematic or the knowledge to either do passive passthrough or setting correct sync pins?

 

[Chopsticks]

exactly what Pivot card and monitor do you have for that IIsi?

I had a color pivot card for the IIsi ages ago and I had some issues getting it working at the time. some pivot cards have weird video output signals, and some default to 640x864 res that almost no modern lcd is going even try to display. some cards from the era also need on of those DB-15 tied to ground or maybe its 5v, this was to change from 15khz to 31khz referesh rate.

in regards to the UniMac82D
the Top Row Dip switch (closest to the DB-15 Mac Video connector) the sense lines are as follows:

sense 0 = 2
sense 1 = 3
sense 2 = 4

to ground any sense line just push that switch towards the DB-15 connecter

 

[Zhinü]

Thank you! Sorry for not commenting back in quite a bit. I found out that you need a specific cable for it. Basically the drivers checks the sense pins on the Mac, and whenever the monitor is rotated, one of the three sense pins either turns on or off. I believe it’s sense 1 that does. Whatever the case I’ll probably just build a cable for it as it’ll be annoying to change the adapter every time I want to turn the monitor. Thank you though!