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- Read-me for CMDP.IMG
- ====================
-
- CMDP.IMG is a copy of Psion's DOS-like "Command Processor" application
- from the ROM of the WorkAbout (a new industrial/ corporate hand-held
- computer).
-
- CMDP was written primarily as an aid to developers working on the
- WorkAbout itself. For example, CMDP will interpret any autoexec.btf
- file found on the WorkAbout on system start-up. However, CMDP will
- also run on an S3a, and it has many features that might make it
- attractive to general computer-literate owners of S3a's.
-
- CMDP accepts commands typed in by the user, or from *.BTF batch
- files. These commands allow file maintenance, machine customisation,
- machine monitoring, process control, and lots more besides.
-
- CMDP also has a menu bar, but this basically just duplicates features
- available in other S3a apps (such as Time), and so is less likely to
- be of interest to S3a users.
-
- CMDP features a full command line editor to recall and edit previously
- entered commands. The display screen supports both Zoom and Wrap.
-
- Users can type "HELP" to see a brief listing of the commands known to
- CMDP. Or type eg "HELP SET" for more details of a given command
- (such as "SET").
-
- Full documentation on the Command Processor is available in the file
- CMDPDOC.ZIP, which should be available from the same source as you
- obtained this file. CMDP.DOC (a W4W2 file) is actually a chapter
- from one of Psion's SDKs.
-
- Sorry, CMDP won't run on an S3 classic.
-
- ================================================================
-
- In the remainder of this read-me, I'll just list a few reasons I
- personally find CMDP useful, together with some observations on which
- parts of CMDP.DOC do not apply for CMDP.IMG running on an S3a.
-
- Where CMDP.DOC tells users to press Shift-Esc, S3a users simply press
- the Help key. (There's no room for a dedicated Help key on the more
- restricted WorkAbout keyboard.) Likewise, just use the standard task
- keys, instead of trying to switch tasks using Psion-Tab (as works on
- the WorkAbout). Finally, although Psion-Ctrl-Del resets the
- WorkAbout, it has no such efect on an S3a. (To improve its dustproof
- qualities, and for other reasons, the WorkAbout has no reset hole.)
-
- CMDP has features to control a backlight, and a "special keyboard";
- these have no effect on an S3a. CMDP also offers a choice of serial
- ports, to use with Remote Link; on an S3a, only port A will be
- accepted.
-
- CMDP.DOC describes an opening screen allowing developers to choose
- between a system screen interface and the command processor
- interface; clearly, this does not happen on the S3a. (That's because
- the two machines have very different "shell" programs, ie the
- sys$shll.img processes.)
-
- As for my personal notes on using CMDP on my S3a:
-
- I often find the FILES command useful. Thus FILES A: lists all
- processes that have got files open on A:. The output from FILES
- ROM:: can also be interesting.
-
- The SET command allows users to view and even update the environment
- variables on the S3a. Needless to say, you oughtn't to modify one of
- these variables unless you are really confident you know what you're
- doing!
-
- The batch file handling in CMDP is reasonably sophisticated, as you
- can see if you look at some of the examples given in CMDP.DOC.
-
- There's a (hidden) command REASON, mainly intended for use within
- Psion (that's why Help doesn't list it), giving a numerical code for
- the reason for the last time (if any) the machine reset.
-
- Note that the STOP command just sends a terminate message to apps,
- rather than an "exit" message as used by the S3a System Screen. So
- you can end up losing unsaved data if you use this to stop apps.
-
- You can even use KILL TIME to get your machine into a state you would
- never normally reach (since the S3a itself has no facility to allow
- you to kill Time). This example isn't that helpful, but there are
- cases when KILL LINK (or KILL SYS$NCP) may be a life saver.
-
- Last but not least, DIR \xxx /s can be a life saver too - for when
- you know you've copied a file somewhere onto a drive, but can't
- remember exactly where.
-
- ================================================================
-
- Product Development at Psion will be interested to hear of people's
- experiences in using CMDP. Any comments placed eg on the Psion
- conference on CIX will be read (sooner or later). If your comment is
- WorkAbout-specific, use the psion/workabout topic; if it's just
- general chatter, use the psion/chatter topic; otherwise use your own
- common sense!
-
- These notes written by: David Wood, 16th March 1995.
- ----------------------------------------------------
-