GN_Skd, Skip delimiters in byte sequense
Register parameters
RST 20H, DEFW $3409
 IN: HL = 0, read from stream IX HL = 1, read from filter IX HL = 2, not allowed HL > 255, read at (HL) A = terminator IX = optional handle (if HL = 0,1) OUT, if call successful: Fc = 0 HL = points to terminating character processed (if HL(in) > 255) A = terminator Fz = 1, terminator seen Fz = 0, terminator not seen OUT, if call failed: Fc = 1 A = error code: Registers changed after return: ..BCDEHL/IXIY same AF....../.... different