Shoehorned

We don't take memory as seriously as we used to - most computers nowadays have more memory than was dreamed possible twenty-odd years ago, and applications have expanded to fill the abundance available.

So while there are those that are still producing impressive code in 4k for example - I was geniunely impressed to run across this listing for 1K Chess on a ZX81. In the end, while Parsec is impressively small it still has access to massively more RAM and resources while it's running - the ZX81 only had 1k to play with full stop (unless of course you were filthy rich and had the 16k RAM pack).