May June 1980 - Commodore Computers

MAY/JUNE, I JUNE. 1980. 198O. ISSUE 4. 4 COMPUTE. 103 1O3
"ENTER" WITH ATARI
"ENTER" WITH ATARI Len Lindsay
The power to insert or append program segments is
The power to insert or append program segments is
built right into your ATARII computer, even though it
is not mentioned in the ATARI documentation.
Here is an example of how thiss capability can be
utilized. Let's say you just finished ished writing in g a program
called FASTTRAP. You have it saved either on tape
ca lled FASTTRAP. You have it saved either on tape
(CLOAD) or an di sk (SAVE" D:FASTTRAP").
(CLOAD) or an disk (SAVE"D:FASTTRAP").
Now you are developing g another program called
NEWPROG. There are several routines in FAST-
NEWPROG. There are several routines in FAST­
TRAP that you would like to include in NEWPROG.
TRAP that you would like to include in NEWPROG.
The hard way to do this, of CO course, UI'se, is to type [hcm them
in again. The easy way is to entcr enter them from
FASTTRAP, and here is how to do it. .
Any program sections that you wish to merge into
another program should be recorded on tape or disk
another program should be recorded on tape or disk
usi ng th e LI ST command. The format for tape is:
using the LIST command. The format for tape is:
LIST"C:",sssss,eeeee
" ,sssss,ccccc
The format forr disk is:
LIST"D:FILENAME",sssss,eeeee
The sssss should be replaced by the starting line
The sssss should be replaced by the starting line
number of the section, and the eeece eeeee should be re­
placed by the ending line number. If you wish all
placed by the ending line number. If yo u wish all
th e lines reco rded you may leave air th e lin e
the lines recorded you may leave off the line
numbers.
There are two routines in FASTTRAP that you
There are two routines in FASTTRAP that you
would like to use in NEWPROG. Lines 2000 to
20099 are a routine that allows the ATARI to
determine which plug your joystick is attached ached to.
With the program F ASTTRAP in memory save the
With the program FASTTRAP in memory save the
routine to tape like this: [his:
LIST"C:",20000,20099
or to diskd like this:
LIST"D:IDENTIJST. LIST' ' IDENTIJST .SUB" SUB", ,20000,20099
The other routine in F ASTTRAP you would like to
The other routine in FASTTRAP you would like to
reuse is one that allows the user to easily y choose
what color his piece will be. It is in lines 20300 to
what color his piece will be. It is in lines 20300 to
20399. Save this s routine to tape like this:
LIST"C:",20300,20399
LIST' 'C:" or to disk like this:
LIST"D:COLORSET. LlST" D .SUB" SUB", ,20300,20399
You still have your program FASTTRAP saved on
tape or disk. In addition you now have twO other
tape or disk. In addition you now have two other
tapes or two other disk files, as created above. . Now
type NEW and enter your new program, NEWPROG,
as usual. At any time during your programming ming you
may Ill append the routines previously recorded. Here is
how you would insert sen the routine to set the piece
color from tape:
color from tape:
ENTER"C:"
or from disk:
ENTER"D:COLORSET.SUB"
Now you might as well insert rt your ur other o routine like
this (from tape):
ENTER"C:"
or from disk:
ENTER' ENTER"D:IDENTJST.SUB"
' After Alter yo you u have inserted these, do a LIST aand you
will see that your program does indeed now include
the two routines. Lines ENTERed in this manner wi will
automatically y be placed in the appropriate section of
the program (by line number). If an identical line
number is already used in your program, it will be
replaced by the one you a re ENTERing. You can
replaced by the one you are ENTERing. You can
insen insert or append program sections in any y order you
wish. If you accumulate a library of subroutines
wish. If you accumulate a library of subroutines
in this manner, writing new ATARI programs will
be easier, since some ooff the program is all rcady ready
to go , ready to be ENTERed whenever you need it. ©
to go, ready to be ENTERed whenever you need it. ^
Atari Program
Saving · Part II
Atari Program
Saving-Part II
SAVE"D:FILENAME.EXT"
LOAD"D:FILENAME.EXT"
Len
Lindsay
Lindsay
Last issue I listed some methods of SAVING a
program to tape. Here are the updates for disk. sk.
To save a program to disk in the normal way
(tokenized form) enter this:
SAVE" D:FILENAME.EXT" [RETURN]
[RETURN]
If you have more rc than oneo disk, you can save to disk
sk
number two by using g D2 in place of the D0 in all
examples.
A program saved in this normal manner ner can be
loaded back by this command:
LOAD" D:FILENAME.EXT" [RETURN]
[RETURN]
You also can save your program onto disk in its
untokenized form like this:
LIST"D:FILENAME.EXT"
LIST"D:FILENAME_EXT" [RETURN]
It then can be read back using this command:
:
ENTER"D:FILENAME.EXT" [RETURN]
Using LIST, you can save the whole program (as
above) or just a section of it. To save any section, seClIon,
simply specify the starting and ending line numbers
of that section like this:
s:
LIST"D:FILENAME.EXT", ,100-900
[RETURN]
This will save just lines 100 through 900. ©