

                     Using the PC Emulator under RISC OS

       This directory contains the components necessary to make existing
       copies of the Acorn PC Emulator (AKA42) operate under RISC OS.

       The new start-up sequence employs a memory optimisation technique
       designed to free the maximum amount of RAM on 1Mb systems. As a
       result, the application will not start if there is unsaved data in
       the Desktop or in the RAM Filing System. 

       Note that there is no mechanism for returning to the RISC OS
       environment once the PC Emulator has been entered - you must
       reset the machine at the end of each session.     

    1. Floppy disc users

       Create a new, RISC OS PC Emulator disc by carrying out the steps
       below:

       a. Format a new floppy disc and use to make a backup copy of your 
          PC Emulator disc. Name the backup NewPCEm.

       b. Copy the !PC application and the !Boot file from the  Support
          Disc to the root directory of disc NewPCEm.

       To use the PC Emulator, insert the new disc into drive 0 and either:

       auto-boot the disc by pressing SHIFT+BREAK

       or:

       click on the floppy disc icon and, when the directory viewer
       appears, double click on the !PC icon.

       As under Arthur 1.2 you may also type:

       PC.Emulate
  
       at the Supervisor Prompt (*) if you wish to run the PC Emulator 
       without any memory optimisation.

       In each case, insert your original MS-DOS boot disc when prompted 
       to do so.


    2. Hard disc users

       a. If you have not already installed the PC Emulator on your
          hard disc, do so now, following the instructions supplied
          in the original package.

       b. Copy the !PC application from the Support Disc to the
          desired position in your hard disc directory heirarchy.

       To use the PC Emulator, click on the hard disc icon, bring up 
       the appropriate directory viewer and double click on the 
       !PC icon.
        
       As with floppy disc, you may also start the PC emulator without
       memory optimisation by typing:

       PC.Emulate

       at the Supervisor prompt (*).