last-minute TI-990 available

990's are 16 bit computers heavily influenced by the architecture of the pdp-11. The main difference is the working registers were kept in memory, allowing very fast context switches, at the expense of register access performance. Later machines cached the register sets. There was a small single-user floppy disk based os (for the 990/4 based on the TMS9900), but the main OS was DX-10, which was replaced by DNOS on the 990/12 series. Their primary use was in small buisiness, they had COBOL, FORTRAN, BASIC, and things like rje, data base and forms management packages, and networking. It seems they were widely used in inventory and parts management systems. The history of the 990 says the system was originally developed as part of a hotel management system. dave pitt's site (as well as bitsavers) are good sources of information http://www.cozx.com/~dpitts/ti990.html