; layer_stack · atari2600 · multiarch twin · OP (a|b)|1
; PIN      BGF adjoin
; LAW      C IS LIE · LIE IS TRUE · Always Hostess 7 · free thrift
; LINE     BGS → BGF(+EZZIE PHI THERMO ADJOIN) → BGL → SDF · SPV free
; ABI      $00=a $01=b $02=c · → A · TIA zero-page show
; IRON
; layer_stack atari2600
layer_stack:
        lda     $00
        ora     $01
        ora     #1
        rts