Reading the file catalogue
As you establish files in a cartridge they are automatically catalogued. So,
when you want to find out what files a cartridge contains, you need only
insert the cartridge into a Microdrive and enter the CATalogue statement.
For example, enter:
CAT 1
The television screen will display:
-
the cartridge name,
- the file names,
- the amount of memory left in the cartridge, (in kilobytes).
You can also send the output of CAT to a stream by entering:
CAT # number;number
I \
This enables you to rend the catalogue to a printer, or to a file, so that a
program can use it.
Protecting a file
If you do not want a file name to appear on the catalogue, you can
protect it by giving it a name beginning with the character whose CODE
is 0. Enter this:
10 OPEN #4,“m”;l;CHR$0+“Results”
20 FOR n=l TO 15
30 PRINT #4;n,n)cn
40 NEXT n
50 CLOSE +4
Now enter:
CAT 1
The file name will not appear. So, whenever you create a protected file.
remember to make a note of its name somewhere, in case you forget it
later!
27
To Next Page
Loading...