         << LINES .001/.009 ARE RESERVED FOR SYSTEMS INTEGRATION >>     00000001
Bit 2     .DRQREQ       This bit is set when the LDR causes    <<D2047>>00396000
                        a physical IO to be done.              <<D2047>>00397000
                                                               <<D2047>>00398000
    LDR'DRQ'BIT                   =2,   <<PHYSICAL IO IS DONE>><<D2047>>01185000
    LDR'DRQ     =   LDR'FLAGS.(LDR'DRQ'BIT:1)#,                <<D2047>>01285000
