Hex-Bus

The Texas Instruments Hex-Bus interface (sometimes used unhyphenated as Hex Bus and with varying capitalization) was designed in 1982 and intended for commercial release in late 1983.

), it was never released, with only a small number of prototypes appearing in the hands of collectors after TI pulled out of the market.

A WaferTape drive never made it past the prototype stage due to reliability issues with the tapes.

The 5.25-inch floppy drive also never made it past the prototype stage, even though it worked.

[2] A 4-color printer-plotter, a 300-baud modem, RS-232 interface, an 80-column thermal/ink printer, and a 2.8" "Quick Disk" drive were the only peripherals released in quantity, mostly for use with the TI CC-40.