Commodore 1581 - Save With Replace Command; Verify Command

FORMAT FOR SAVE WITH REPLACE
DSAVE "@file name" [,Ddrive#] [,Udevice#]
The actual procedure is this—the new version is saved complete
ly, then the old version is scratched and its directory entry altered to
point to the new version. Because it works this way, there is little
danger a disaster such as having the power going off midway through
the process would destroy both the old and new copies of the file.
Nothing happens to the old copy until after the new copy is saved
properly.
VERIFY
This command makes a byte-by-byte comparison of the program
currently in memory against a program on diskette. This comparison
includes the BASIC line links, which may be different for different
types of memory configurations. What this means is that a program
saved to disk on a C64 and reloaded into a C128 wouldn't verify
properly because the line links point to different memory locations. If
the disk copy of the program differs at all from the copy in memory, a
"VERIFY ERROR" will be displayed. This doesn't mean either copy is
bad, but if they were supposed to be identical, there is a problem.
FORMAT FOR THE DVERIFY COMMAND
DVERIFY "file name" [,Ddrive#] [,Udevice#]
The following version of the command verifies a file that was just
saved:
DVERIFY "*"
This command won't work properly after SAVE-WITH-REPLACE,
because the last file used was the one deleted and the drive will try to
compare the deleted file to the program in memory. No harm will
result, but "VERIFY ERROR" will always be announced. To use DVER
IFY after @SAVE, include at least part of the file name that is to be
verified in the pattern.
COPY
The COPY command allows you to make a spare copy of any
program or file on a diskette. However, on a single drive like the 1581,
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