Seiko Group BP-6000 - Manual (Page 80)

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B. Control code summary (IBM)
ITEM SYMBOL Hexadecimal Decimal FUNCTION
[57] ESC _ n [1B,5F,n] H [27,95,n] D Sets/cancels overscore mode.
n=0 : Cancels overscore mode.
n=1 : Sets overscore mode.
[58] ESC g [1B,67] H [27,103] D Selects 15 cpi character mode.
[59] ESC k n [1B,6B,n] H [27,107,n] D Selects NLQ font type.
n=0 : ROMAN is set.
n=1 : SANS SERIF is set.