With the Atari, there was the ST-FM and the ST-E. The ST-E had two extra joy stick ports on the side of the computer. Did anyone ever find anything that ever used them? The ones underneath were 9 pin (I think) and the ones on the side had three rows in the D shaped socket.
Never had a chance to compair the ST-E against the ST-FM side by side. So I'm not sure if it really was worth it. All I'll say is that it was easier to upgread the RAM in an ST-E as it had a vacant slot. Strewth! £80 for half a meg of RAM

*geek mode on*
The STE was also a modified chipset - it had a "blitter" chip that made most of the standard ST-FM games NOT work on the STE. It was major egg on face for Atari, as essentially they'd broken compatibility.
The sad thing was that the new chip was designed to work faster and help with graphics manipulation. Just that the games developers had never written to use it and not much testing was done on older games to check they'd still work.
The ST-E was essentially sidelined.