Without further ado, the following was found: Issue: ISO 4873 → ISO/IEC 4873 "ISO 4873 stipulates a narrower use of character sets, where G0 is fixed " "(always ASCII), so that G1, G2, and G3 can be invoked only for codes with " "the high order bit set. In particular, B<\\[ha]N> and B<\\[ha]O> are not " "used anymore, ESC ( xx can be used only with xx=B, and ESC ) xx, ESC * xx, " "ESC + xx are equivalent to ESC - xx, ESC . xx, ESC / xx, respectively."
