Comment by bitwize

The Tandy 2000 had four custom slots that only accepted their own card format. Here again it was doomed to failure and it's kind if a shame because the cards were easy as balls to install: the cards were mounted on metal trays and slid in horizontally, guided by rails in the chassis, and did not require the cover of the machine to be removed for insertion or removal.

Only a few expansion options were available, all from Radio Shack: a color graphics option (640x400x8 colors in 1983!) for which you had to procure the matching monitor, a memory expansion (up to two could be installed for a total of 768k, by stacking RAM chips some aftermarket vendors got this to 896k), a bus mouse adapter/real-time clock combo board, and I believe an external hard disk controller. One expansion, the "TV/Joystick expansion" which would give the 2000 composite out and access to joysticks for gaming, was planned but (to my knowledge) never released. As far as I know only one graphical game saw commercial release for the 2000: a special build of Microsoft Flight Simulator.