Hi JaNoZ, unfortunately you can't put an EISA card into an ISA slot, it's the other way around, you can put an ISA into an EISA. EISA had extra pin pads below the ISA pads to implement a 32 bit bus.

Thx for the reply, i am really confused now.

I read this:
http://www.techfest.com/hardware/bus/eisa.htm

and this phrase is particularly interesting:
"EISA expansion boards use the signals on the ISA compatible portion of the connector as well as additional signals that provide enhanced function and performance."

Anyone has any firsthand experience?
I do not want to do some extra frying tonight, i already made some fries and frikandellen, i am stuffed.

Hi again JaNoZ, since the 32 bit pads on the EISA connector hang below the ISA pads IIRC it is too long to seat into an ISA slot. But in any event, it wouldn't work if you could, the MB chipset has to support EISA and there is usually a setup program that you have to run to make the motherboard and card talk properly. This is all from memory back in the day, so if anyone else can add any details I'm missing, please do.

Too bad, really bad, i have some handheld 486dx2-66 with brown isa slots, and narrow pins would this be eisa.
How can i tell does it say something burned into the brown (e)isa slot.?
Too low on experience for eisa.

well, if the slot is brown and the other ones are black, it's possibly EISA, usually it says somewhere on the MB if it is. If you had a picture I'd recognize it immediately.

yes youre right, the brown only slot.
The eisa cards have wider slots and dont fit isa bus.
I have an portable 486dx2_66 from compaq and its two eisa slots are very thin with extr blocking slots inside the slots to prevent the normal isa card to drop in too deep, and it has writing eisabus.

Mistery solved.