MASK9            4151 src/dps8/dps8_cpu.c     w1        |= (RS_REG & MASK9) << 9;
MASK9            4152 src/dps8/dps8_cpu.c     w1        |= flags2 & MASK9;
MASK9            4163 src/dps8/dps8_cpu.c     w1        |= flags2 & MASK9;