DC_Nq, handle Director/CLI enquiries

RST 20H, DEFW $160C

IN:

C = reason code
B = 0, always

The reason codes are:

Value	Name	Description
$00	DQ_Dev	Get default device
$03	DQ_Dir	Get default directory
$06	DQ_Fnm	Get filename match string
$09	DQ_Dmh	Get the director memory handle
$0C	DQ_Inp	*** NQ_Ihn ($8615) link (IX=$0006 always)
$1F	DQ_Out	*** NQ_Ohn ($8618) link (IX=$0007 always)
$12	DQ_Prt	*** NQ_Phn ($8609) link (IX=$0003 always)
$15	DQ_Tin	Get input-T handle
$18	DQ_Tot	Get output-T handle
$1B	DQ_Tpr	Get printer-T handle
$1E	DQ_Chn	Reset serial port and get NQ_Chn ($8612)

OUT:

Fc = 0:   Success, result in IX
Fc = 1:   A = RC_UNK ($03)

Internal operating system usage.
This call is used by the OS_NQ if B = $8C.
Some reasons are specific, some of them are direct link to the OS_NQ.
For DQ_Inp, DQ_Out, DQ_Prt use OS_NQ.