A Great Platform Studies Answer
To how software keeps getting better and graphics get better-looking on the same old consoles.
Note that for the Atari VCS / Atari 2600, only answers #3 and #4 apply, since developers didn’t use “engines” or even compilers, instead writing their code in assembly langauge. (Presumably the assemblers didn’t improve much over the years.) Also, the VCS had no firmware, flashable or otherwise; although refined versions of the hardware were produced over the years, such as the Atari 2600 Jr., such systems were optimized for cheaper manufacturing and didn’t improve performance.