Artifact Details Title TI-99/4a cartridge expander Catalog Number 102647208 Type Physical object Description Object is documented by instructions embossed on the back side. It fits into the normal TI-99 cartridge slot and offers three cartridge slots and a three-way switch to select between them. Manufacturer Navarone Industries Dimensions 1 x 5 x 6 1/4 in. Category I/O device