Your place for the TI-99 Home Computer Family, with focusing on internal documentation and the TI-99/8
Left: pre-production MBX Unit
Right: commercial MBX Unit
The pre production unit has a lot more holes in the plastic case than the commercial unit. I still don’t understand the meaning of the big hole area, was it meant to be expanded or mechanically or even electrically plugged into something? The board of the pre production unit has a metal shielding which is not in the commercial unit.