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- ;
- CD.COM
-
- Size (recs) CRC Version Author/Latest Issue Disk
- CD.COM 3k (20) 26FD 3.9 Carson Wilson 6/89 Z3COM2
- CD.3OM 3k (20) B501 3.9 Carson Wilson 6/89 Z3COM2
-
- 1- Syntax 2- Usage 3- ST.COM 4- Notes 5- Err Msgs 6- Examples of Use
-
- Change Directory is used to move from one directory to another by using the
- names or literal DU forms associated with the directories. CD first logs into
- the referenced directory, and, if there is a file named ST.COM in it, CD will
- log the user into the referenced directory and invoke ST.COM. If there is no
- file named ST.COM, CD will simply log the user in.
-
- CD.COM is for ZCPR 3.0; CD.3OM is for ZCPR 3.3, 3.4, and Z3PLUS.
-
- Original by R. Conn, 4/84.
- :1
-
-
- Syntax CD or CD // <-- Print help message
-
- CD du[:] <-- Activates ST.COM upon logging into directory
-
- or CD du password <-- Allows changing to a passworded directory
-
- or CD dir[:] <-- Activates ST.COM upon logging into directory
-
- or CD dir password <-- Allows changing to a passworded directory
- :2
- Usage - 1/2
-
- Under ZCPR3, there are two basic ways to log into a directory. One way is
- by using the DU: or DIR: prefix, like:
-
- B1:ASM>TEXT: ...or
- B1:ASM>C7:
-
- The other way is by using CD, like:
-
- B1:ASM>CD TEXT: ...or
- B1:ASM>CD C7:
-
- The tradeoff is in user efficiency. If a directory is always used for a
- particular function, such as cataloging disks, CD may be preferred because it
- will not only log the user in but will also run ST.COM, which can set up his
- environment, such as by running MENU or some other program or group of
- programs.
- Usage - 2/2
-
- The user's environment can change drastically by using CD to log into a new
- directory. The names of the directories he can access can change (LDR changes
- the Memory-Based names), the command search path he uses can change, and he
- can even find himself in a MENU environment or other front-end instead of a
- ZCPR3 command environment.
-
- As distributed, ZCPR3 permits 14 named directories simultaneously in memory
- (though it's easy to allocate more memory buffer space, 18 bytes per name, if
- that's desired). By running ST, a different named directory file can be
- loaded for each directory entered, permitting up to 448 names per (logical)
- drive (14 names x 32 areas).
- :3
-
- ST.COM
-
- ST.COM is an alias file used to establish desired conditions in a
- directory. The only purpose of ST is to load the multiple command line buffer
- with a command line when it is executed without any options. This command
- line may contain a reasonable number of commands which perform any desired set
- of functions. ST.COM is searched for in the current directory. CD may
- require a password to move to the new directory.
-
- In the ZCPR3 environment, good candidate commands to be executed by running
- ST via CD include the following:
-
- LDR file.NDR <-- Set up a new directory environ
- PATH path-exp <-- Set up a new Command Search Path
- MENU <-- Invoke the MENU Preprocessor
- ECHO message <-- Print a Message to the User
- :4
- CD Notes - 1/3
-
- a. Version 3.9 updates (6/89):
- - help screen no longer shows "CD DU password," as this was never
- actually an option.
- - all ZCPR 3.0 version errors now clear the command line before exiting.
- - Previously CD would cause ZCPR to ask for a password a second time if
- the "CD dir password" form was used with the wrong password. Version
- 3.9 performs the appropriate error procedure immediately.
-
- b. Version 3.8 updates (5/89)
- - changed so that both versions work with BGii. If BGii present, chain
- to error handler, but don't write to message drive/user bytes.
- - tests for Z80 processor.
- - added local stack save/restore because Z3INIT/ZSYSCHK overflow CP/M
- 2.2's CCP stack.
- CD Notes - 2/3
-
- c. Version 3.7 updates:
- - Puts back space following STCL and LOGCL, which were deleted due to
- poor Z3LIB documentation on the PUTCL routine. Though the help file
- says PUTCL takes a "null terminated command line" as a parameter,
- PUTCL really requires a command BUFFER the size of the current ZCPR
- multiple command line buffer. CD uses 256 bytes, which is the
- current maximum for Z-System. PUTCL should implement its own buffer
- rather than requiring the user to provide one for it.
-
- d. Version 3.6 updates:
- - Bruce Morgen pointed out that a type-3 header does not prevent ZCPR
- 3.0 from loading a type-3 program compiled to run at 100 hex.
- CDxx.3OM therefore is no longer a type-3 program, and now tests for
- ZCPR33 or above via the Z3LIB Z33CHK routine. Z33CHK also returns
- false if BGii is present.
- - If you are using BGii you should run CDxx.1OM as BGii does not
- implement the message buffer drive and user bytes required by
- CDxx.3OM.
- CD Notes - 3/3
-
- - Removed extra pages of space following labels STCL and LOGCL.
- - Removed BGii existence check from CDxx.3OM, as Z33CHK handles this.
- - Added ZSYSCHK for CDxx.1OM to test for ZCPR environment.
-
- e. Version 3.5 updates:
- - All Z33 errors chain to error handler.
- - All Z30 errors give message and abort.
- - Only NON-error status messages are suppressed by the ZCPR Quiet Flag.
- - Uses Z3LIB GETCCP routine to find CCP, allowing CD to work under
- Z3PLUS.
- - Implements assembly-time equate TYPE3 instead of using Z33CHK, which
- was inconsistent since a type-3 header would have prevented CD's
- running under type-1 no matter what Z33CHK said, and compiled two
- versions: CD35.1OM is type 1 and should be installed with Z3INS and
- used for ZCPR 3.0. CD35.3OM is type 3 and is for ZCPR 3.3 and 3.4 and
- Z3PLUS. It has a type-3 header so will not run under ZCPR 3.0.
- :5
-
-
- Selected Error Messages
-
- "Command Line Overflow"
-
- -- there was not enough room in the command line to insert the command
- to invoke ST.COM.
- :6
-
-
- Examples of Use
-
- a. B0:WORK>cd text:<cr> <-- Log into directory TEXT:. An ST alias
- PW? mypass<cr> in TEXT: might then load a new .NDR, set
- C7:TEXT> up a new command search path and place
- the user in a menu.