From Learn @ Cemetech
Switches the compiler between big and little endian modes. Originally in TASM, copy in BRASS.
.lsfirst is the same as .little.
.lsfirst .int $123456 ; Outputs $56, $34, $12.
.big is the same as .big.
.msfirst .int $123456 ; Outputs $12, $34, $56.