I was having my daily Lemmings check ebay and came across another version i havent got, single sided Atari ST Lemmings...i thought eh? Whats that? cant all STs play the same games? So after checking i came across a massive list of ST models, i know the Amiga had 3 models for its games machine line based on the similar chipset (A500/+/600) but the ST had 11, thats crazy and shows what a mess Atari were sorting this machine out, by the time they did a good 4 years had past. Anyway heres a confusing list!

520ST original model with 512 kB RAM

130ST intended to be a 128 kB variant. Announced at the 1985 CES alongside the 520ST but never produced.

520ST+ early 520STs with 1 MB of RAM, but without floppy disk

260ST originally intended to be a 256 kB variant, but actually sold in small quantities in Europe with 512 KB. Used after the release of the 520ST+ to differentiate the cheaper 512 KB models from the 1 MB models

520STM a 520ST with a built-in modulator for TV output.

520STFM a 520STM with a newly redesigned motherboard in a larger case with a built-in disk drive.

1040STF a 520STFM with 1 MB of RAM and a built-in double-sided floppy disk, but without RF modulator.

1040STFM a 520STFM with 1 MB of RAM and a built-in double-sided floppy disk with RF modulator.

520STE a 520STFM with enhanced sound, the BLiTTER chip, and a 4096-color palette, in the older 1040 style all-in-one case.

1040STE a 1040STFM as above.

4160STE as 1040STE but with 4 MB of RAM.  This machine was never officially released except a small quantity of development units.  Labels were sent out to dealers so they could affix them to the machines that had been upgraded to 4MB.