Using an Apple M3502 21" Fixed Frequency Display In Windows 95.
To get your Apple M3502 fixed frequency display running on Windows 95 you'll have to do this (read the notes above since these are also relevant):
Firstly, get hold of a copy of Scitech Display Doctor 6.5
http://www.scitechsoft.com/. Providing that your card can support 1152x870 at 75hz, you should be able to configure Display Doctor to run at 1152x870 75Hz, with negative sync on the horizontal and vertical (all these settings can be adjusted via Display Doctor, providing you use Display Doctor's video driver - Display Doctor also has presets for Fixed Frequency monitors). This seems to work, probably because Display Doctor looks like it can get your graphics card to do incredible things. If you can't get it to work, you might want to check out this page on getting Sun fixed frequency displays to work in Windows 95. It is at
http://www.iaehv.nl/users/leibbran/sunmon/sunmon.htm. I am running my M3502 display on an S3 2mb Virge DX graphics card, and am getting excellent disply quality (albeit in 1152x864 in thousands of colours only), thus dispelling the myth that the Virge can't do 1152x864.
The Settings to Use in Scitech Display Doctor 6.52
Right, the best settings to use in Display Doctor are as follows (please note that these settings work with the Apple M3502 fixed frequency display and may not work with other display types):
Firstly, you need to select "(Fixed Frequency Monitor Types)" from the list of monitors. Then, if you want to run it in 1024x768, make sure the following settings adjustments are made:
Minimum and Maximum horizontal scan rates must be 66 and 70 respectively, and min and max vertical scan rates must be 70 and 90 respectively. Also make sure the hsync and vsync check boxes are both checked. Timing calculations must be Discrete.
If you want to run the monitor at its proper resolution (1152x864 - giving you more screen size) then make sure the following adjustments are made:
Minimum and Maximum horizontal scan rates must be 66 and 70 respectively, and min and max vertical scan rates must be 60 and 80 respectively. Also make sure the hsync and vsync check boxes are both checked. Timing calculations must be Discrete.
Once these settings have been entered, you can adjust the screen display to your liking by using the Centre Screen facility in Display Doctor. When using the Centre Screen facility, make sure you use the 84 Hz option for 1024x768 and the 75 Hz for 1152x864. If these frequencies aren't listed then you have either not entered the horizontal and vertical scan rates correctly, or your card does not support that frequency at the said resolutions (in which case, you will have to buy a higher spec graphics card, though bare in mind, my S3 1mb Trio can do it so I am sure most cards should be able to cope!).
A useful tip from Frank van 't Veer told me that you may have problems getting the resolution to 'stay' after you have centred the screen in Display Doctor. To get round this you have to change the refresh rate in the advanced settings of Display (in control panel) from optimum to standard or default adapter. Also, make sure that you are using the Display Doctor driver not the Windows one, and that the resolution in Display is set to 1024x768 or 1152x864.