Just powered up the 1040STf with my MegaFile30 and ran the system info utility. This little bad boy has 4mb ram in it!! Cracked it open and found a Marpet MP210A ram board in it with a full 4meg of ram. Also had TOS 1.4 (Rainbow).     The 520ST also had an upgrade in it. It has a Aerco easieST solderless ram board in it. It has 1mb. Would like to find documents for this to fill the other bank.