error: Built-in symbol '_RS' cannot be purged
    at rs-overwrite.asm(1)
error: '_RS' already defined as built-in
    at rs-overwrite.asm(4)
error: '_RS' already defined as built-in
    at rs-overwrite.asm(10)
error: '_RS' already defined as built-in non-EQU
    at rs-overwrite.asm(16)
error: '_RS' already defined as built-in non-EQUS
    at rs-overwrite.asm(19)
Assembly aborted with 5 errors!