(Word Processing Tip)

RESETTING DISKS IN PERFECT WRITER

[If you use Perfect Writer, you've known the
frustration of needing to reset the disk in the
B drive.  Maybe you've written off more than
the disk can chew; or maybe you simply have a
file which you'd like to write onto more than
one disk.  The effect is the same: PW won't let
you save to a second disk without first
exiting to CP/M and executing a "warm boot." 

Users of that ingenious program, Pluperfect
Writer, don't have that worry; a disk reset
command is among its many clever features. 
Now, however, there is relief for users of
plain vanilla PW.  This tip appeared first in
the @UX{Kappa Hacker}, newsletter of the XXXX
KUG (Karen--get name from Diana).  We've tried
it, and it works.  And it's easy to do.
                                    -- LL.]

Why Perfect Writer left out a disk reset is a
mystery to me: nothing is easier to program
than the BDOS 13 call (Note: the BDOS 13 call
in CP/M is a built-in function to reset disks.) 
Below is a patch to insert a disk reset to
replace one of the present Perfect Writer
commands...

1. Look at Appendix A-43 in the PW manual and
find a function that you do not use.  The
example below uses <ctrl>-x s = "MGOSPELL",
because I don't use Perfect Speller.  If you
do use it, select another function from the
Appendix. 

2. Find the HEX address of the function
command:  @ux{(Note: this step is only for
those choosing a different function command. 
If you are using @P[<ctrl>-x s], you won't need
to bother.))

Put your PW Installation disk in Drive A and
enter: 
        @P[PW.SYM<cr>]

Be prepared to use <ctrl>-s to stop the
screen's scrolling.  You'll see columns of
function names with numbers which are the HEX
addresses of PW's routines.  Find the
replaceable function you want, and write down
the HEX number.

The HEX address of @P[<ctrl>-x] s is 5EC9. 

3. Now put your CP/M disk in Drive A and a
working copy of PW.COM in Drive B.  After
logging onto the B drive, type:

        @P[a:ddt pw.com]

Presently, your screen will read:

       DDT VER 2.2
       NEXT PC
       8800 0100
       -

4. Type @P[a] followed by the HEX address of
the command you want changed.  For our example,
you'd type:

       -@P[a5EC9]

Note the lower case "a" and the upper case "E." 
From here on, you must type upper and lower
case exactly as printed here.

5. You will be given a series of addresses, to
which you must reply exactly as written.  We
have numbered them for clarity.  (The addresses
are printed in regular type; your replies are
printed in boldface.)  

(Note again that the first address (5EC9) is
for replacing <ctrl-x s> and will be different
if you've chosen a different command to
change.)  Here we go:

       1. 5EC9 @P[LXI B,000D<cr>]

       2. 5ECC @P[CALL 005<cr>]

       3. 5ECF @P[LXI B,000E<cr>]

       4. 5ED2 @P[LXI D,0001<cr>]

       5. 5ED5 @P[CALL 005<cr>]

       6. 5ED8 @P[RET<cr>]    (you type the 
                              letters "RET",
                              not a <cr>.)

       7. 5ED9 @P[.]          (you type a
                              period.)

For safety, I ordinarily work on Drive B in PW. 
If you wish the default drive to be Drive A,
change the 4th command to:

          5ED2 @P[LXI D,0000<cr>]


6. At the @P[-] prompt, type:

       -@P[g0<cr>]             (lower case g;
                               zero)   

You'll get a "warm boot message."


7. Save all the changes by typing:

       A>@P[save 137 pw.com<cr>]


That's all.  Try it out by putting the PW disk
in A and a data disk in B.  Call up a file. 
Take the disk out of B and insert a new one. 
Type @P[<ctrl>-x s], then give the save command
(@P[<ctrl-x, <ctrl>-s<cr>].  If PW writes the
file to the new disk, you're in business.

Don't forget to copy the new version of PW onto
every disk or user area where you have the old
version installed.       6. 5ED8 @P[RET<cr>]    (you type the