I'm 95% certain there are two versions of the IA-1 BIOS floating around: hackable and non-hackable. The version you end-up with may be a crap-shoot.
Several users of this BBS including me (AirMan), Garfield, Stingray, and Scarebear (with an IA-2) have been unsuccessful in accessing the BIOS setup program. We can successfully short the jumper with a paperclip or by moving the jumper itself and receive the memory check, but no matter how or when we press the Compaq button we can never get the setup program.
I originally purchased several IA-1's from Tiger. Two for me to run Linux and one for my mom to run MSN. I somehow hosed my first IA-1 and returned it to Tiger. I've never been able to get into the setup program on my second IA-1. My mom's IA-1 has been fine running MSN.
Today, I got my Mom's IA-1 and did the paperclip trick on it. As soon as I applied the power, I could see immediately there was something different about it. For one, the cursor was completely visible and I could see it drop. The cursor was not visible at all on the other (non-hackable) IA-1. Secondly, the memory check was different. It was drawn higher up on the screen and rendered in a different size and font. I'm telling you guys, this memory check was noticeably different than the memory check on the non-hackable IA-1. Hitting the Compaq button after the memory check completed resulted in the setup program.
Because of the very noticeable differences between the two IA-1's I have compared, I believe there are two versions of the BIOS floating around.