Thinkpad AT installation problem

[soupman]

I've been having a problem that is exactly the same as outlined in

http://news.gw.com/freebsd.newbies/5472

when attempting to install FreeBSD 4.8 on my IBM Thinkpad AT clone (486).
The same problem occured when I used floppies of different versions
including 4.6 and 4.7.  I tested the floppies on one of my other machines
and the Kernel Configuration Menu came up fine, no reboot.  Is it
impossible to install FreeBSD via floppies on this machine? Will the
images work?  Thanks.