DC_Xin, Examine CLI input

Register parameters

RST 20H, DEFW $1E0C
IN: 
    -

OUT:
    Fc = 0 : CLI has input stream
    Fc = 1, A = RC_Eof : there is no CLI or no input stream

Registers affected after return:
    ..BCDEHL/IXIY same
    AF....../.... different

Notes

Internal operating system usage.

Related calls

DC_Icl, Invoke new CLI
DC_In, Read from CLI
DC_Out, Write to CLI
DC_Prt, Print to CLI
DC_Rbd, Rebind streams
DC_Gen, screen driver SOH call
OS_Cli, CLI interface