clk              2098 src/dps8/dps8_scu.c             uint64 clk = set_SCU_clock (scu_unit_idx);
clk              2099 src/dps8/dps8_scu.c             cpu.rQ =  clk  & 0777777777777;    // lower 36-bits of clock
clk              2100 src/dps8/dps8_scu.c             cpu.rA = (clk >> 36) & 0177777;    // upper 16-bits of clock