Posted By
George
on 2019-06-19
17:58:53
 |  Load a BASIC Program from a BASIC Programm
Hi,
Does anybody know if it is possible to load a Basic Program from a Basic Programm?
I want to chain two programms:
Programm A-> Program B
Greetings George
|
|
Posted By
Spektro
on 2019-06-19
19:48:53
 | Re: Load a BASIC Program from a BASIC Programm
Hi George,
Yes, it's possible. Here is an example:
Save the following program as "TEST1":
10 PRINT"HELLO"
20 DLOAD"TEST2"
Save the following program as "TEST2":
10 PRINT"WORLD"
Load the first program (TEST1) and run it. The first program will print "HELLO" and then loads the second program (TEST2). Once the second program has been loaded, it will be run automatically and thus it will print "WORLD". If you have additional lines in TEST1 after the line 20, those lines will never be executed.
|
|
Posted By
SVS
on 2019-06-20
02:02:37
 | Re: Load a BASIC Program from a BASIC Programm
Caution, if the second program is larger than the program in memory, you have to manually fix the variables BASIC pointers at:
$2D/2E: End of program +1
$2F/30: End of variables +1
$31/32: End of arrays +1
In this way you can keep the variables created by the first program. If you don't, the variables pointers do remain the same and will corrupt the code of the second program.
|
|
Posted By
George
on 2019-06-20
02:10:56
| Re: Load a BASIC Program from a BASIC Programm
@Spektro Thank you. I tried this but have the effect SVS describes.
@Svs Thats the effect i have. 2 prg is larger. Is there an example around how to fix the pointers?
|
|
Posted By
SVS
on 2019-06-20
05:59:45
| Re: Load a BASIC Program from a BASIC Programm
You can retrieve the end-address of the program in this way:
- load the larger program;
- Peek($9D), Peek($9E) to obtain the end-address+1 to POKE inside the address' I've specified.
If you do the POKEs by the first program (in its first statements) you can maintain the variables between one prg to another.
|
|
Posted By
MikeZ
on 2019-06-20
07:17:19
 | Re: Load a BASIC Program from a BASIC Programm
Nicely done SVS!
|
|
Posted By
George
on 2019-06-20
07:25:01
| Re: Load a BASIC Program from a BASIC Programm
Thanks SVS!
I decided not to use it. I kept the programm separated.
This is a good topic for the knowledge base.
Greetings
George
|
|
Posted By
GeTE
on 2019-06-21
09:01:58
| Re: Load a BASIC Program from a BASIC Programm
I used to use it often in my very old and first programs. You only had to write the commands on screen, fill the keybuffer with returns, set the cursor on top of the screen and stop your BASIC-program with end.
Take a look at the first part of this old crap of mine and you see what I meant: Osterei-Sucherei
|
|
