Power mac Video Different?

[alizard]

This is driving me crazy: I have several centris 650 machines and a Power Mac 8500/120. The radius BW monitor (TDP 19, 0218) has the standard cable with the standard Mac 15-pin (two row) video connector.

Connect the monitor to the Centris and it works perfectly.

Connect to the Power mac and all you get is a few diagonal lines on the screen.

I looked up the pinout for both machines and they are identical.

The radius came with a floppy disk that loads sofware, which loads on the Centris. Load it on the Power Mac and it says the Radius control panel does not operate.

Is this the cause of the monitor's failure on the Power mac?

 

[Kosh66]

No two computers are created the same. The Centris is a 68K based computer/Mac. The PowerMac 8500 is a PowerPC based computer/Mac. Is the software PowerPC compatible? It's been years (over 10 years) since I went through the 68K to PowerPC conversion, but I believe the first PowerPC/68K software was a fat binary which is similar to a universal binary. You need the fat binary or PowerPC version of the software most likely.

 

[alizard]

Still very odd. Both video ports appear to be the same pinout and function yet a monitor plugged into one works but not the other....

 

[Kosh66]

Is it a monchrome monitor? PowerPCs lost the low-end of the gray-scale graphics too.