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- From: wrh@PHYSICS.WM.EDU (William Hall)
- Newsgroups: comp.sys.apple2
- Subject: Re: AppleSoft Basic Question
- Message-ID: <9211122123.AA16159@physics.wm.edu>
- Date: 12 Nov 92 21:23:21 GMT
- References: <9211120306.AA12528@physics.wm.edu>
- Sender: daemon@ucbvax.BERKELEY.EDU
- Distribution: world
- Organization: The Internet
- Lines: 46
-
- As typed by Eric D. Shepherd ...
- >
- > Okay... to place the Applesoft source into a text file, add this line to
- > the beginning of the program, then run it:
- >
- > 1 PRINT CHR$(4)"OPEN FILENAME":PRINT CHR$(4)"WRITE FILENAME":LIST 2-:PRINT
- > CHR$(4)"CLOSE":END
- >
- > Don't forget to delete line 1 after you've done this!
- > To convert the text file back to an Applesoft program, just type:
- > EXEC FILENAME
- > That's it!
- > - Eric S.
- > --
- > Eric D. Shepherd | Apple II Alliance Charter Member
- > InterNet: uerics@mcl.mcl.ucsb.edu | ACM Member
- > FidoNet: 1:206/2713 Eric Shepherd | Programming Law #1: "When in
- > AOL: Sheppy | doubt, rewrite from scratch."
- >
- That's almost it. Before running line 1, either type
- POKE 33,33
- or add this POKE to the beginning of line 1. Someone had this in an earlier
- message, and I remember someone else asking why. Here's why: Without this
- POKE, Applesoft nicely word-wraps lines by inserting carriage returns at about
- the 34th column of the screen (40-column mode). Which means that your text
- file will look exactly like the listing, BUT, if you EXEC this text file, you
- will not get the entire program as it appeared originally unless you had really
- short lines. The problem is, once Applesoft sees that carriage return, it
- accepts the line as is, and awaits another command. The next line it receives
- is the continuation of the previous line, which does not have a line number, so
- Applesoft assumes it is a command. Therefore, it does NOT get entered as part
- of your program, and might give you a syntax error.
- The POKE 33,33 sets the width of the screen to 33 columns, so Applesoft does
- not get a chance to insert the word-wrapping carriage returns, and the only
- carriage returns that show up are at the end of each line, which is exactly
- where we want them.
-
- Whew! I guess that was a bit long-winded, but here's the quick summary:
-
- * If you want to make a text file of an Applesoft program, AND you want to be
- able to turn it back into an Applesoft program, type POKE 33,33 before you run
- line 1 given above.
- --
- William R. Hall | wrh@physics.physics.wm.edu | College of William and Mary
- | hall@wmheg.physics.wm.edu | Department of Physics
- | Williamsburg, VA 23187-8795
-