I'm a little puzzled. When I bought my SL-5500 on eBay it was listed as having 32MB of memory and the system info, the free command, et al back that up. Nothing seemed strange about it until I started reading oesf.org and the ZUG site, where it's implied that 5500s always have 64MB, the 32MB machines are 5000s. It has "SL-5500" printed on the back of the case & I can't see any other indications of what it is, in the absence of better info I'd conclude it's a very early 5500 (like the extremely rare 256MB Atari STs), although I do have to wonder if it's a 5000 in a 5500 shell.
What I'm most interested in, is will I be able to use roms designed for the 5500? I'm planning on using ones that put /home on a card, was going to do that anyway, but some instructions say to do something different depending on whether the machine is a 5500 or a 5000 & I'm not certain whether that's just because of the different ram size.
One thing I will be doing is watching niv's thread asking whether the Zaurus can be taken up to 128MB.