^832x624, which is the stock resolution of the M1298 16" monitor shown on my IIfx in my avatar. Another option, if you decide to give up on the Futura, is a Radius PrecisionColorPro 24x or 24xk. Have the latter in said IIfx, replacing an Apple 8•24 that was in it previously.
Possible that yours got upgraded previously. Did it have the removable fan on the power supply, or was it the all-metal cased version introduced with the IIvx?
Also, if you want a slight power upgrade, get the power supply from a Performa 600, IIvx, IIvx, Centris/Quadra 650 or a PowerMac 7100. It's so similar that it works on the IIcx, IIci, and Quadra 700 boards.
Nice score. My first working IIfx was one that started out as a II. Originally was going to upgrade to a IIx, so I'd still have a somewhat stock machine, but with a 68030 chip instead of the 68020. Alas, the board I received was dead. So, picked up an fx board from one of the members here...
No worries. I once blew the bus on my original //e by reinstalling a couple chips that blew on a Saturn 128KB memory card, then installing that into the computer. So, we all have done that before. Typically, the 74LS05 chip is the one that I've had the worst luck with on the controller cards...
I do notice that the disk ][ controller card is installed backward on your 32KB ][ Plus board... That could cause weirdness right there, if you've been testing with it positioned that way.
I'd create an account over at audiokarma.org and ask there, if no one here has experience with it. That site is the 68kMLA of the audio equipment world.
How new is that PRAM battery? Looks like an older Saft.
I assume you've tried the quick flip with the power switch trick, where you turn it on, then quickly cycle the power again?
Remember that the IIsi and the Wombat board machines (Centris 650, Quadra 650/800) use different video circuitry as well. Which adapter are you using? If it's a Sony MacView LX, try putting it into VGA mode. That may cause it to work normally. I know that when I had said adapter set up for a...
Conquesting a Radius PrecisionColor Pro 24xk for the IIfx either tomorrow or Thursday. May also be grabbing another M0116 keyboard. Same seller who I dealt with last month
Nice score.
For those interested, here's where Apple was located in the Seattle, Washington area at the time, this copy of PageMaker was sent to the owner:
https://maps.app.goo.gl/DaD8hdxfuxMLDpgn7