mjohnson@APPLE.COM (Mark B. Johnson) (12/02/89)
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Apple II
Technical Notes
_____________________________________________________________________________
Developer Technical Support
ProDOS 8
#24: BASIC.SYSTEM Revisions
Revised by: Matt Deatherage November 1989
Written by: Matt Deatherage July 1989
This Technical Note documents the change history of BASIC.SYSTEM through V1.4,
which ships with System Software 5.0.2. V1.0, the initial release, is not
documented in this Note, and V1.1 is described in BASIC Programming with
ProDOS.
Changes since July 1989: Revised to include BASIC.SYSTEM 1.4.
_____________________________________________________________________________
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.
Further Reference
_____________________________________________________________________________
o BASIC Programming with ProDOS
o ProDOS 8 Technical Reference Manual