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   M i n e r v a   S o f t w a r e   T e c h n i c a l   R e l e a s e

   Number: 009/SiHDsc                                      Minerva House   
   Date:   12/12/89                                      Baring Crescent
   Author: MK                                              Exeter, Devon
   Pages:  01                                                    EX1 1TL
            
                        9. Using SigmaSheet on a hard disc
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To use SigmaSheet on a hard disc, you should have a RISC OS machine. If your
SigmaSheet is pre v2.00 you should make a backup and convert it using the
RISC OS support disc. The software may be copied to the hard disc as follows
(use the desktop drag mechanism to copy the files):

1. Copy the contents of the LIBRARY directory to the LIBRARY directory on
the hard disc. This should be the directory which ADFS perceives as the
library; normally it will be $.LIBRARY but some users may have changed it.

2. Copy everything else wherever you like. It is suggested that a directory
called $.SIGMA should be used

3. Now start SigmaSheet by double-clicking on the !Sigma icon in the
directory used. Before doing this, you may wish to use the task manager to
allocate as much memory as possible to the NEXT slot (see Archimedes User
Guide). You should also make sure there is at least 32k of sprite memory and
that you are in MODE 12 (using the palette manager).

4. Once you are in SigmaSheet, use the *command option to issue the command
to select the directory containing your data files, eg:
          *dir :4.$.SIGMA 
you may then proceed as normal.

Common pitfalls 
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1. The library is not called $.LIBRARY on
drive 4. This is most common with a 310 with hard disc upgrade since the
machine will be configured to have drive :0 as the default and will
therefore expect to find the library on the floppy disc. Fix by configuring
to drive :4.

2. The user attempts to start SigmaSheet by SHIFT-BREAK or by
double-clicking on !Boot. This will not work! Start by double-clicking on
the !Sigma Application which shows Sigma Sheet Symbol in the directory
viewer.

3. The modules do not initialise properly. This can happen if you re-start
SigmaSheet after a failure or quitting. Fix by pressing CTRL-BREAK.

4. The modules do not load. This can happen if the module RAMMANAGER does
not match the module SIGMA in the library, for example an update has been
provided and only one module was copied over. Fix by deleting all copies of
these modules and re-copying these two files from the latest SigmaSheet
master disc available.

5. The wrong module loads, eg. SigmaSheet still asks for the master disc
even after upgrading to un-protected. This is similar to (4) above but note
that the unprotected module is probably called SIGMANP. This will not load
if SIGMA is present as the actual filename used is SIGMA*

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