STX
data[0] = STX;
if (one_char(board, &b) != DLE || one_char(board, &b) != STX) {
INSN_3(STX, ATOMIC, B), \
INSN_3(STX, ATOMIC, H), \
INSN_3(STX, ATOMIC, W), \
INSN_3(STX, ATOMIC, DW), \
INSN_3(STX, MEM, B), \
INSN_3(STX, MEM, H), \
INSN_3(STX, MEM, W), \
INSN_3(STX, MEM, DW), \