PROGRAM TO COPY A FLOPPY DISC




   A stand alone program on a paper tape is provided  to  enable  a  floppy
disc  to  be  copied.  The  paper  tape  is  called 'COPY FLOPPY' and the
procedure is as follows:-

    1) Load the MUSS11 system in the  normal  manner  and  then  halt  the
    processor.  This action will load the 'paper tape bootstrap' into core,
    alternatly the DEC bootstrap may be used - see their manual.

    2) Remove the system disc from the machine and place  the  disc  to  be
    copied  from into drive zero. The blank disc, or disc to be overwritten
    is loaded on drive one.

    3) Load the paper tape into the reader.

    4) Set the address '077500' on the switch  registers  and  press  LOAD
    ADDRESS.

    5) Raise the HALT SWITCH and press START.

    6)  The  paper  tape  should  now  load in, if it stops part way along,
    repeat the entire process.

    7) The COPY program runs automatically and prints the letter  'A'  as
    it completes each track on the disc.

    8) After completing the entire disc, the program will halt at 030230.

    9)  If  it  halts  anywhere else, a fault has occured, try it again, by
    restarting COPY at address '030000', but it may mean that  one  of  the
    discs is unusable.

























                                CARD READER




   There  are  two  main  ways in which the card reader will fail to read a
card, there is a different recovery procedure in each case.

    1) PICK CHECK In this case the card reader fails  to  'pick'  a  card
    from the input hopper. The system is notified and a
                                CR OFFLINE!
    message  is  output.  The  bottom  card  of  the input hopper should be
    examined, if it is damaged then it will have to be repunched,  otherwise
    load  the  cards  in  again. The RESET button should be pushed and the
    following message typed in at the console:

    (esc) CO CR

    2) READ CHECK In the case of a read check a card  has  actually  been
    read  but  not  correctly,  in  a  small  number  of cases two cards may
    actually have been read. There is no way to distinguish between the two
    cases, however, normally a re-read of the last card is enough. The read
    error is signalled by the 'LT. CHK.' light on  the  card  reader,  the
    system  is not told at that stage that a fault has occured. To recover,
    place the last card read back in the input hopper and  press  the  reset
    button.  As  in  the  pick  check case, the 'CO CR' message should be
    typed in.