Why would you type that?
Read the release notice on the fora.
Core is the replacement for microcore.
If you want a gui, you need to also install Xlibs, Xprogs, an X server ( Xvesa or Xorg), a window manager such as flwm_topside, and optionally wbar.
tce-load -iw Xlibs
tce-load -iw Xprogs
tce-load -iw Xvesa
tce-load -iw flwm_topside
tce-load -iw wbar
xsetup
startx