Register parameters
RST 20H, DEFW $2409
IN:
IX = filter handle
OUT, if call successful:
Fc = 0
IX = 0
BC = number of input characters written to filter
(BC = 0 provided at least one character has been read)
DE = number of characters read from filter
OUT, if call failed:
Fc = 1
A = error code:
RC_HAND ($08), IX(in) was not a valid filter handle
Registers changed after return:
......HL/..IY same
AFBCDE../IX.. differentÂ