These kinds of projects are basically always impressive, in particular on machines which predate the concept of protected memory. It is especially impressive on this machine.

For anyone who may not be familiar with the TI-99/4A, it is a strange beast. It competed with 8-bit micros like those from Commodore and Apple. On paper, the TI-99/4A looked more impressive because it has a 16-bit CPU, but the machine is effectively limited to 8 bits anyway due to supporting hardware and logic elsewhere. The weird design backfired, because it’s ultimately a very slow machine and obviously less performant than those 8-bit machines against which it was meant to compete.