I got Win98 working on h87 performance with i5 4690k and 16gb ram and ati x600.It boots win98 from usb and sata.
On z690 ud ddr4 with i7 12700k, 32gb ram(tried with 16gb ram too, does not work).It does not boot win98 from usb nor sata. Disabled cores, lowered cpu and ram clocks, etc and it still does not work. (normal boot or safe mode its the same error)(with ram limit in system.ini and himemx.exe with ram limit)
I get vcache protection error. bootlog ends at: "[00142D3F] DEVICEINIT = VCACHE"
Saw a video with a russian guy getting the same vcache protection error on z390, he then used an adapter and 2gb ddr4 sodimm and it was the same.
I installed softice(I don’t know how to use it):
