Earlier quoted context omitted.
The Tandy Color Computer did not have such a chip, but it did have a 6-bit DAC (Digital/Analog Converter) that could be used to both sample and play back sound. Yes, it was CPU intensive, but you could get some pretty impressive results (I recall sampling songs, and even playing music with 4-part harmony).
Watching The 8-Bit Guy's youtube channel I'm convinced the Tandy was probably the best DOS computer ever. A shame I never owned one; I went from an XT clone with monochrome graphics (the Hercules card had a charm of its own!) to an AT with a VGA videocard. I understand that the EGA emulation the VGA was capable of was similar but not exactly the same as Tandy color graphics.
It may seem weird, but the Tandy 1000 copied the graphics modes from the IBM PCjr, not the EGA standard. That included a 320x200 16 color mode, as well as 640x200 four color mode that the original CGA couldn't do (because it lacked memory). The IBM PCjr also included a sound synthesis chip (don't recall which one off the top of my head) that may also have been included in the Tandy 1000 (don't know, had the PCjr, not the Tandy).