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- Apple II
- Technical Notes
- _____________________________________________________________________________
- Developer Technical Support
- ProDOS 8
- #24: BASIC.SYSTEM Revisions
-
- Revised by: Matt Deatherage May 1992
- Written by: Matt Deatherage July 1989
-
- This Technical Note documents the change history of BASIC.SYSTEM through V1.5,
- which ships with Apple IIgs System Software 6.0. V1.0, the initial release,
- is not documented in this Note, and V1.1 is described in BASIC Programming
- with ProDOS.
-
- CHANGES SINCE SEPTEMBER 1990: Revised to include BASIC.SYSTEM 1.5.
- _____________________________________________________________________________
-
-
- V1.1
-
- o Fixed a bug in variable packing (used by CHAIN, STORE, and RESTORE).
- o Changed the interpreter to use the ProDOS startup convention of a JMP
- instruction followed by two $EE bytes and a startup pathname buffer.
- o Removed a bad buffer address in the FIELD parameter of the READ
- routine.
- o Fixed a bug in APPEND so calls to OPEN and READ from a random-access
- file would not cause the next call to APPEND to any file to use the
- record length of the random-access file.
- o Added the BYE command to allow ProDOS QUIT calls from BASIC.
- o Removed the limited support for run-time capabilities which had been
- present.
-
-
- V1.2
-
- o Changed the CATALOG command to ignore the number of entries in a
- directory when listing it so AppleShare volumes could be cataloged
- properly (this number can change on the fly on an AppleShare volume).
- o Fixed another bug in CATALOG so pressing an unexpected key when a
- catalog listing was paused with a Control-S would no longer abort the
- catalog.
-
- V1.3
-
- o Changed BSAVE so it now truncates the length of the saved file when
- the B parameter is not used. To replace the first part of a file
- without truncation, use the B parameter with a value of zero. This
- behavior with the B parameter is how V1.1 and V1.2 worked without the
- B parameter.
- o Fixed a bug in CHAIN and STORE where they expected one branch to go
- two ways at the same time.
- o Added the MTR command for easier access to the Monitor from BASIC.
- o Made internal changes to the assembly process for easier project
- management. These changes do not affect the code image.
-
- V1.4
-
- o Fixed a bug which caused a BLOAD into an address marked as used in the
- global page to start performing a BSAVE on the file instead of
- returning the NO BUFFERS AVAILABLE message. For this reason,
- BASIC.SYSTEM version 1.3 should not be used.
-
- V1.4.1
-
- o Fixed a bug in the mark handling routines. When using the "B"
- parameter to indicate a byte to use as a file mark, the third and most
- significant byte would never be reset before the next use of B. For
- example, if you used a B value of $010000 and then used a B value of
- $2345, BASIC.SYSTEM 1.4 would use $012345 for the second B parameter
- value.
-
- V1.5
-
- o Fixed centuries-old bug where NOTRACE after a THEN (as in IF/THEN)
- disconnected BASIC.SYSTEM. Now it doesn't.
- o BSAVE now modifies the auxtype of an existing file only if the file
- type is $06 (BIN).
- o BASIC.SYSTEM can now launch (with "-") GS/OS applications. Files of
- type $B3 are passed through to an extended QUIT call to the ProDOS 8
- MLI.
- o $B3 files are now listed as S16 in the catalog.
- o Fixed a bug in the READ command where reading from the slot 3 /RAM
- disk passed errors back to BASIC, making the program break without
- completing a legal operation.
- o Code optimized and crunched slightly.
-
-
- Further Reference
- _____________________________________________________________________________
-
- o BASIC Programming with ProDOS
- o ProDOS 8 Technical Reference Manual
-