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CPM OPERATING SYSTEMS/CPM 8000 (CPM8K)/P-CP M-Z8K SOURCES/sg/sys7.tex

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+.bp odd
+.he
+.cs 5
+.mt 5
+.mb 6
+.pl 66
+.ll 65
+.po 10
+.hm 2
+.fm 2
+.ft All Information Presented Here is Proprietary to Digital Research
+.ce 2
+.sh
+Section 7
+.sp
+.sh
+Cold Boot Automatic Command Execution
+.tc 7  Cold Boot Automatic Command Execution
+.ix Cold Boot Automatic Command Execution
+.sp 3
+.fi
+.sh
+7.1  Overview
+.tc    7.1  Overview
+.pp
+The Cold Boot Automatic Command Execution feature of CP/M-8000 allows you to 
+configure CP/M-8000 so that the CCP will automatically execute a predetermined 
+command line on cold boot.  This feature can be used to start up turn-key 
+systems, or to perform other desired operations.
+.ix turn-key systems
+.sp
+.sh
+7.2  Setting up Cold Boot Automatic Command Execution
+.ix CBACE feature
+.pp
+The CBACE feature uses two global symbols: _autost, and _usercmd.  These are 
+both defined in the CCP, which uses them on cold boot
+to determine whether this feature is enabled.  If you want to have a CCP
+command automatically executed on cold boot, you should include code in your
+BIOS's _init routine (which is called at cold boot) to do the following:
+.ix _autost
+.ix _usercmd
+.ix _init routine
+.sp 2
+.in 8
+.ti -3
+1) The byte at _autost must be set to the value 01H.
+.sp
+.ti -3
+2) The command line to be executed must be placed in memory at _usercmd and
+subsequent locations.  The command must be terminated with a NULL (00H) byte,
+and may not exceed 128 bytes in length.  All alphabetic characters in the
+command line should be upper-case.
+.sp
+.in 0
+.pp
+Once you write a BIOS that performs these two functions, you can 
+build it into a CPM.SYS file as described in Section 2.  This system, when
+booted, will execute the command you have built into it.
+.ix CPM.SYS file
+.sp 2
+.ce
+End of Section 7
+.bp
+.he CP/M-8000 System Guide                            End of Section 7
+.sp 30
+.bp
+.nx eight