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Message started by ggn on 31.10.09 at 17:56:24

Title: Re: Hidden messages in code
Post by ggn on 31.10.09 at 19:22:34
Eliminator
----------


Quote:

                                                   John M Phillips
                                                   Cronabar
                                                   North Pill
                                                   Saltash
                                                   Cornwall
                                                   PL12 6LJ

                                                   Tel: 07-555-3392

14th August 1988

Dear Tony,

       On this disk is everything you'll need for protecting Eliminator.

The files are as follows:

     ELIMINAT.JMP      - game code (300k)

     ELIMINAT.NEO      - title screen

     AUTO/JMPBOOT.PRG- my demo booter

     JMPBOOT.S      - source for above

Other details:

-- The game calls TRAP#15 before each level, my booter puts a
   dummy rte here

-- You can put your protection code above the screen at $7FD00

-- There is a 16K table at address $8E02..$9E01 which you can re-use for
   your protection buffer since it is re-generated before
each level

-- The game code should be loaded at $13000. Call $13008 to run.
   Note that the game should be called in supervisor mode with interrupts
   off, this is all detailed in JMPBOOT.S


     Hope that's clear. Good luck !!


                 Yours Sincerely

                       John M Phillips


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