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CCP-PLUS.DOC
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1986-10-17
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CCP+ is a CP/M Plus CCP replacement. It is a result of
dissasembling the CCP supplied with CP/M Version 3.0 and
modifying the resultant source code for use in an RCP/M system.
Because most of the code is copyright by Digital Research, only
registered users of CP/M Plus may use this CCP replacement.
This CCP includes the following changes:
1. All built-in commands have been removed. None are needed
since Digital Research supplies the equivalent transient
commands with CP/M 3. The user number is changed by
entering u: at the system prompt, where u is the new user
number.
2. It is not necessary for .COM and .SUB files to have the SYS
attribute to be accessable from other user areas. The CCP
searches user 0 (if the current user number is non-zero)
after the current user number is searched for each drive in
the command search path.
3. Commands of the form du:command or ud:command or u:command
are allowed.
4. The display of the user/drive in the system prompt has been
reversed to be consistent with ZCPR.
5. If the command or submit file to be executed is password
protected and the correct password is not supplied or the
default password does not match, a "Password:" prompt
appears and the user is given one chance to enter the
correct password.
6. The time (in the format [HH:MM]) is displayed at the system
prompt. This can optionally be turned off. Also, for RCP/M
systems, the caller's connect time instead of the current
time can optionally be displayed at the system prompt.
7. The CCP checks for the presence of a BYE RSX, and if BYE is
active, stop/start scroll support is turned off. All RCPM
listing utilities monitor ^S input, so the BDOS should not
monitor console input during console output in an RCPM
system. The CCP uses function 60 (RSX function 4) to test
for BYE active. My version of BYE returns 0 in register A.
If this function reaches the BDOS, 0FFH is returned.
Checking for BYE active can optionally be turned off.
8. The CCP uses offset +9 in the System Control Block to pass
the user number of the file to load in conjunction with
function 59. The value passed is user number+1, with 0 =
current user number. The Loader resets this value to
0. Transient programs can set SCB+9 to load files
from different user numbers.
9. If a .COM or .SUB file cannot be found, the message "command
not found" is displayed.
10. Named directories are implemented (similar to ZCPR). If
directory names were loaded via SETDIR, the name of the
drive/user is displayed. The CCP also calls any active LBR
RSX's to display their Library names. The display of
directory names can be turned on or off by using the DIRNAME
utility. The directory name file (ROOT.DIR) can be created
using your favorite editor. Use the sample supplied for
syntax. The CCP supports password protected directories.
To log into a named directory, simply enter its name as a
command with an optional password, and if it is password
protected, and the correct password was not supplied, a
password will be prompted.
11. Full support of the ZCPR wheel byte is implemented including
MAXDRIVE, MAXUSER, and WHEEL. If the wheel byte is set,
access is allowed to any named directory without regard to
password protection or the settings of max drive and user.
If the wheel byte is zero, access is denied to out-of-bounds
drive and user areas as determined by MAXDRIVE and MAXUSER.
To log into an out-of-bounds area when the wheel byte is
zero, you must enter the name of the target directory, then
if it is password protected, supply the correct password.
If this is successfull, the MAXDRIVE and MAXUSER locations
are modified to reflect the extended access.
12. A Cmdrun facility similar to the ZCPR LRUN command, which
executes commands from a library has been implemented.
CMDRUN can load any CP/M+ command file from COMMAND.LBR
including .COM, .SUB and .PRL files. CMDRUN is invoked
automatically if the CCP cannot find the required command,
and CMDRUN in turn, searches for COMMAND.LBR using the drive
search chain, and follows the filetype search order as set
by SETDEF for selecting members once COMMAND.LBR has been
found. Note that the cmdrun facility can be optionally
selected.
The following options can be selected by using setting them
to YES in the file CCPHDR.MAC:
YESLBR EQU NO
Yes, to allow library command processor to be loaded and run
if the command cannot be found.
WHLLBR EQU NO
Yes, to check Wheel byte before running library command
processor. No effect unless YESLBR is YES. If yes, the library
command processor will only be run if the wheel byte is 0FFH.
EXPAND EQU NO
Yes, to expand the users universe if the Wheel byte is zero
and the user enters the name of an out of bounds directory and is
successfully taken there. This will cause the MAXDRV and MAXUSER
bytes to be updated to the expanded access.
BYECHK EQU NO
Yes, to check for presence of BYE, and if BYE is active, to
disable flow-control checking (XON/XOFF). For this to be
effective, BYE509 or newer must be present and CCPPLUS set to YES
in BYE.
NOXOFF EQU NO
Yes, to always disable flow-control (XON/XOFF). Should be
left NO, except with an older version of BYE. If set yes, then
there is no way to pause output from most non-RCPM utilities.
TIME EQU NO
Yes, to display current time at the system prompt in the
form [HH:MM]. But see TIMEON below.
TIMEON EQU NO
Yes, to display caller's connect time instead of current
time at the system prompt. Both TIME and TIMEON must be set yes.
Only effective with BYE509 or newer. Reverts to display current
time if BYE is not active.
YESPRL EQU NO
Yes, to allow loading of MP/M PRL (page relocatable) files.
Leave this NO unless you have MP/M specific programs.
You can use SID or EDFILE to modify the following locations
in CCP.COM:
3E0H: FCB for locating and loading the library command
processor as follows:
3E0H: User number+1. 0 = use default user number.
3E1H: Drive code+1. 0 = use drive search chain.
3E2H: File name (must be exactly 11 bytes). The current
file name is 'CMDRUN COM' (CMDRUN.COM).
I have been using the CCP in the Meadowlark RCPM for over 3
years. It offers ZCPR-like capabilities which most callers are
used to, and also allows the Sysop and privaleged users to easily
use password protected commands.
If you make use of CCP+, and have any comments or
suggestions, call the above RCPM at 403-435-6579 @ 300/1200 baud,
or voice at 403-437-2591.
Jul 14, 1986
Jim Lopushinsky
Edmonton, Alberta, Canada