Summary:
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.
Background:
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.
Mystery Solved:
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.
Conclusion:
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.