Changes

* The additional "italics" and "IBM" symbols seem to require to use character numbers 80h..FFh. There are control codes to manipulate the MSB, so one should be able to use these characters even with 7bit 7 bit ports (in case of 80h..9Fh and FFh one may additionally need to disable control-code mirroring; caution: if this function might also disable the 9Bh-to-1Bh mirroring, so one couldn't send any further ESC codes).