Reply 20 of 26, by lalakobe
Thanks everybody for your help! I see now that DX motherboards are indeed rare. Will look for 'classic' mbs that are available (will be assembling 486-era PC some time later, so additional versatility would be an overkill, but thanks for detailed explanation!)
As for CPU/FPU, I have one restriction (kinda like a challenge 😀 ) - it must be the fastest Intel-manufactured CPU and/or FPU, so that narrows down my search even more (no AMD DX-40 motherboards).
Were all 386 motherboards designed with barrel batteries? I found a picture of EVEREX STEP 386 REV. E (presumably) motherboard, and it has only CR-2032 slot attached (possibly later modification by owner?)