[pguertin]

STORE_ACCUMULATOR may be easier to understand than STA, if you're seeing it for the first time, but it's not easier to use once you know what it means.

Incidentally, I wrote a simple 6502 assembler back in the days, and I took the opportunity to invent my own notation, just for fun. I became quite adept at reading and writing it, and standard notation felt very verbose after a while.

Here is, in standard notation, a program that copies 256 bytes from ORIGIN to DEST.

        LDY #$00
  LOOP  LDA ORIGIN,Y
        STA DEST,Y
        INY
        BNE LOOP
        RTS

Here is the same program in my notation (yes, all on one line. I used a space character to delimit instructions).

  Y<0 LOOP: A<(ORIGIN,Y) A>(DEST,Y) Y+ #LOOP ]