Matt.O'connell@f421.n109.z1.fidonet.org (Matt O'connell) (12/07/90)
The monitor must be able to handle the following bandwidths to functions with the Apple 8-bit or OBV (on board video ci,si,lc) circuits: Horizontal 35.000 kHz Vertical 67.7 Hz Also, the grounds for the r,g, and b signals aren't specifically chassis or earth ground, they are normally signal return which insures the proper output voltage is maintained. (actually, its more complex thann that but this explanation will suffice ). If your monitor has signal return it should improve the quality of your picture if these were matched to the proper pins on the video card. Pin 3 on the video card is the composite sync and you will need to match that up. The final thing to make sure of is that pin 4 output from the video card is grounded, this signals to the Mac video board that it is working with a 640x480 monitor. Keep in mind if you make a mistake wiring a cable you can easily damage either piece of equipment. If you need more information see Tech Note # 144: Macintosh II Color Monitor Connections. -- Matt O'connell, Matt.O'connell@f421.n109.z1.fidonet.org via The Black Cat's Shack's FidoNet<->Usenet Gateway blkcat.fidonet.org and Fidonet 1:109/401