Your Commodore - Commodore Is Awesome

same line numbers then the new
program lines will overwrite the old.
If we look at our previous example
and give the command:
MERGE "test",8
then you will get the following result
10 PRINT "HELLO"
15 PRINT "THERE"
20 PRINT "HELLO"
25 PRINT "THERE"
no doubt you can see the difference.
Playing With Memory
Quite often when writing programs it
is necessary to save a block of memory
to tape or disk. The C64 has no
commands available to do this so you
must result to POKEing memory. This
gets a little Messy and confusing. The
MLOAD,MSAVE and MVERIFY
commands will rectify this.
MLOAD takes the following
format:
MLOAD "program",dev,I,sa
and allows you to LOAD a program
into any area of memory. 'dev' is the
number of the device that you want to
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LOAD from and 'sa' is the address
where you want the LOAD to start
from
MSAVE allows you to SAVE a
section of memory to the specified
device it has the form:
MSAVE "name", dev,I,sa,fa+ I
where 'so is the start address for the
SAVE and 'fa' is the end address.
DON'T forget to add one on to this.
If you should ever use machine
code then it is quite useful to be able to
set where in memory you want your
Basic program to start. It is also useful
to be able to set the top limit for your
program as well. These functions can
both be performed by POKEs,
however the HI and LO commands
make this much easier.
HI address
will set the Top of memory to 'address'
and
LO address
will set the bottom of memory to
'address'.
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YOUR COMMODORE november 1986:34
Program Readability
Commodore programs are not exactly
well known for their legibility, as you
are no doubt aware they have lots of
graphics symbols in them for things
like clearing the screen etc. The CODE
command will turn any graphics
symbols into mnemonics that
represent the code that is being used.
For example a graphic hart which is
found by pressing shift S would be
represented by [G >S] which means
graphic (G) shift ( >) and S.
To use the command you must
have the program to be changed in
memory and then enter the command
CODE.
NOTE: once this command has been
issued you will not be able to use the
program again, except for listings, etc,
so make sure that you have saved a
copy of the program onto disk or
cassette.
Leaving Extended Basic
Provision has been made in case you
should ever want to quit from the Basic
and return to standard C64 Basic.
Simply type the word QUIT and everything
will be back to normal.
Do Soft
You'll Do it Better
with DoSoft
•