This adaptor is relatively common. The one I have is grey with 4 DIP switches and is made by Philips. The following information is not the same for the (also common) Interex adaptor.

This device has a male DB-15 Macintosh monitor plug on one end and a female DA-15 female PC monitor socket on the other. To use it, one would attach the device to the monitor connection on the Mac and then plug the PC monitor's cable into the adaptor. This is relatively simple to figure out.

The next part is a wee bit harder. Now the task is to select the target resolution and frequencies. It is important to check the manual to see if a certain (generally multi-sync) PC monitor is compatible with the chosen mode.

       DIP switches                   Frequency    
   | S1 | S2 | S3 | S4 | Resolution | Horz | Vert |
   +----+----+----+----+------------+------+------+
   | OFF| OFF| ON | ON |  640x480   | 35.0 |  67  |
   +----+----+----+----+------------+------+------+
   | ON | ON | OFF| OFF|  640x480   | 31.5 |  60  |
   | ON | ON | OFF| OFF|  800x600   | 35.2 |  56  |
   +----+----+----+----+------------+------+------+
   | ON | OFF| ON | OFF|  832x624   | 49.7 |  75  |
   +----+----+----+----+------------+------+------+
   | OFF| ON | ON | OFF|  1024x768  | 60.2 |  75  |
   +----+----+----+----+------------+------+------+
   | ON | ON | ON | ON |  1152x870  | 68.7 |  75  |
   +----+----+----+----+------------+------+------+

Included in these are standard Apple display modes: 640x480 is 13" color, 832x624 is 16" color, and 1152x870 is 21" color.

This node exists since many more of these adaptors seem to exist than instructions to use them. Like the one I came across. Note: I am not a Mac user. I have a Mac, and I had to look this up. And now I share it with all of you.

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