IN: IX = filter handle OUT, if call successful: Fc = 0 A = character from filter Fz = 1, if character is converted, else 0 OUT, if call failed: Fc = 1 A = error code: RC_HAND ($08), Bad filter handle RC_EOF ($09), Filter is empty Registers changed after return: ..BCDEHL/IXIY same AF....../.... different |
GN_Flc, close filter
GN_Flo, open filter
GN_Flr, read from filter
GN_Flw, write character to filter
GN_Fpb, push back into filter