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118 lines
5.0 KiB
Plaintext
118 lines
5.0 KiB
Plaintext
CP/M V2.2
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Application Note 01, 2/20/82
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The CCP Auto-Load Feature
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Copyright 1982 by Digital Reserch
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CP/M is a registered trademark of Digital Research.
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DDT is a trademark of Digital Research.
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Compiled November 1982
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Applicable products and version numbers: CP/M V1.4, V2.0, V2.1,
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and V2.2
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Program: CCP (Console Command Processor)
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Usually, you interact with the CP/M CCP following the sign-on
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prompt. With the CCP Auto Load feature, CP/M executes an initial
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program immediately after loading the operating system.
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Under usual operation, the CCP receives control from the BIOS
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upon a warm or cold boot. The beginning of the CCP module
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contains a two-element jump vector and a command line that takes
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the form:
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CCP: JMP CCPSTART ;START THE CONSOLE PROCESSOR
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JMP CCPCLEAR ;CLEAR THE INITIAL COMMAND
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DB 127 ;MAXIMUM COMMAND LENGTH
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CL: DB 0 ;COMMAND LENGTH
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DB ' ' ;8 BLANK CHARACTERS
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DB ' ' ; "
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DB 'COPYRIGHT...' ;COPYRIGHT NOTICE
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If control is transferred to location CCP (address 3400H in a
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20K CP/M), the console processor examines the command length at
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location CL (3407H in a 20K CP/M). If the command length byte is
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zero, then you receive the sign-on prompt and the CCP waits for
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console input. If the command length byte is not zero, the CCP
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assumes an initial command has already been entered. The CCP
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executes the command on each cold or warm boot if control is
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transferred to location CCP. However, if control is transferred
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to location CCP+3 (JMP CCPCLEAR), the initial command is cleared
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and the program enters the CCP at the command line level,
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displaying the default drive prompt.
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Specify the length of the initial command using a nonzero CL
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byte. The command must be followed by a terminating zero. CP/M
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executes the command following that CL byte. Although only 16
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blank spaces are provided, you can move the Digital Research
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copyright notice for more spaces.
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You can initialize the command line of the CCP on the
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operating system tracks or in the relocatable image within the
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MOVCPM data area. The initial command executes in distributed or
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reconfigured CP/M systems.
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Following SYSGEN and SAVE commands, save the CP/M memory
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image above the cold boot loader code starting at location (980H).
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If the system boot routines require more than 80H bytes, the CCP
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code begins at location 0A00H.
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Modifying MOVCPM.COM is similar to modifying the CCP. The
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difference is that the CCP always begins at location 0A00H.
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The following procedure uses DDT to modify the CCP,
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allowing execution of the initial command DIR after each warm or
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cold boot.
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A>movcpm * *
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CONSTRUCTING 64K CP/M Vers. 2.2
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READY FOR "SYSGEN" OR
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"SAVE 35 CPM64.COM
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A>save 35 cpm64.com
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A>ddt cpm64.com
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DDT VERS 2.2
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NEXT PC
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2400 0100
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-d980
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0980 C3 5C E7 C3 58 E7 7F 00 20 20 20 20 20 20 20 20 ...X...
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0990 20 20 20 20 20 20 20 20 43 4F 50 59 52 49 47 48 COPYRIGH
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09A0 54 20 28 43 29 20 31 39 37 39 2C 20 44 49 47 49 T (C) 1979, DIGI
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09B0 54 41 4C 20 52 45 53 45 41 52 43 48 20 20 00 00 TAL RESEARCH ..
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09C0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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-s987
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0987 00 3
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0988 20 44
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0989 20 49
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098A 20 52
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098B 20 0
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098C 20 .
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-d980
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0980 C3 5C E7 C3 58 E7 7F 03 44 49 52 00 20 20 20 20 ...X...DIR.
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0990 20 20 20 20 20 20 20 20 43 4F 50 59 52 49 47 48 COPYRIGH
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09A0 54 20 28 43 29 20 31 39 37 39 2C 20 44 49 47 49 T (C) 1979, DIGI
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09B0 54 41 4C 20 52 45 53 45 41 52 43 48 20 20 00 00 TAL RESEARCH ..
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09C0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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-g0
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A>save 35 cpm64.com
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A>sysgen cpm64.com
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SYSGEN VER 2.0
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DESTINATION DRIVE NAME (OR RETURN TO REBOOT)b
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DESTINATION ON B, THEN TYPE RETURN
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FUNCTION COMPLETE
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DESTINATION DRIVE NAME (OR RETURN TO REBOOT)
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Licensed users are granted the right to include these
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modifications in CP/M software.
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