Quadra 700 - N/A 800 x 600, 832 x 624 supported?

[Byrd]

Hi all,

I've a Quadra 700 I'm refurbing, it's currently on the bench and I'm putting in some random 256K VRAM modules for upgrades - all 80ns parts.

Using a generic DB15 to VGA monitor adapter (no switches) to a generic VGA display, I can select 640 x 480 (60Hz) and 800 x 600 (56Hz) @ millions of colours. I'm getting some video corruption (random colours behind windows) @ 800 x 600 millions, but not 640 x 480 @ millions.

I don't have an official Apple monitor to test this, but according to online specs, GURU program, the Q700 is only capable of 640 x 480, 832 x 624 or 1152 x 870 - not 800 x 600, and I wondered if my monitor is playing funnies and letting me use a resolution I'm not meant to be using. I've switched various VRAM modules for similar results.

Macintosh Quadra 700: Technical Specifications – Apple Support (AU)

support.apple.com

Can someone please confirm if your Quadra 700 can do 800 x 600?

Thanks

JB

 

[jeremywork]

I haven't seen 800x600 available on either my 700 or 950s.

I'd guess the adapter's ID pins are confusing something.

I did once have an interesting experience with my 700 and a KVM. I had a Multiple Scan 17 connected to the KVM, and used a spare cable from an AppleColor High Resolution RGB (640x480) display. The 700 would start correctly in 640x480, then try to change into its remembered 832x624 and the display would go black. A different cable fixed the problem, but I thought if it had been an issue with the ID pins the computer wouldn't have tried 832x624, so I'm not sure what happened.