[ Hello world
  ===========

  A program for the EDSAC

  Can be used to print any character string:
  the string (including necessary *F and #F
  characters) should be stored in sequential
  memory addresses beginning at @+17.

  The last character of the string should be
  marked with a 1 in the least significant
  bit. This can be coded by using D in place
  of F, e.g. AD would be an 'A' as the last
  character

  Works with Initial Orders 2 ]

        T56K
        GK

[  0 ]  O17@    [ Print character        ]

[  1 ]  H17@    [ AND character with 1:  ]
        C15@    [ if the result is 1, we ]
        S15@    [ have reached the end   ]
        E13@    [ of the string          ]

        T14@    [ Modify the orders in   ]
        A@      [ addresses @+0 and @+1  ]
        A16@    [ to point to the next   ]
        T@      [ character              ]
        A1@
        A16@
        T1@
        E@

[ 13 ]  ZF

[ 14 ]  PF
[ 15 ]  PD
[ 16 ]  P1F     [ NB Least significant bit
                  is not part of address,
                  so add 2 not 1         ]

[ 17 ]  *F      [ Letter shift           ]
        HF
        EF
        LF
        LF
        OF
        !F      [ Blank                  ]
        WF
        OF
        RF
        LF
        DF
        @F      [ Carriage return        ]
        &D      [ Line feed + 1          ]

        EZPF