VGA didn’t exist in 1984, that didn’t come along until 1987. VGA was also specific to the PC architecture, whereas Atari had 256 colors on their GTIA chipped 400/800 computer series in 1981. The Roland MT-32 synth didn’t exist until ’87 as well, although the Atari ST series had full MIDI capability in 1985. Also, it was VCS for “Video Computer System”, which is what the console was called until 1982, when it got assigned Part Number CX2600 (the CX5200 or 5200 Super System came out that year).

I learned to program on the Atari 8-bit series and consoles, so I still know all this by rote.