The install method for the Plan 9 sample PC distribution is 4 DOS floppys. You boot the first one and are instantly out of luck because the plan9 kernel loads, sees the pcmcia slot and tries to initialize it. Now you are floppyless, the install fails.
/bin/disk/prep -a /dev/hd0 /bin/disk/kfs -rb4096 -f /dev/hd0fs /bin/disk/kfscmd allow /bin/mount -c /srv/kfs /n/kfs /bin/vdexpand < /tmp/disk2.vd | /bin/disk/mkext -uv -d/n/kfs /bin/vdexpand < /tmp/disk3.vd | /bin/disk/mkext -uv -d/n/kfs /bin/vdexpand < /tmp/disk4.vd | /bin/disk/mkext -uv -d/n/kfs /bin/cp /n/kfs/386/9pcdisk /dev/hd0boot /bin/cp /n/kfs/386/9pcdisk /n/c:/plan9 <-- see note (*) /bin/disk/kfscmd sync Ctrl-Alt-DELnote(*): this is from memory, copy 9pcdisk into the c:plan9 directory. Cd around and make sure this is it.