Conversational Monitor System

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The Conversational Monitor System (CMS – originally: "Cambridge Monitor System") is an interactive single-user operating system. CMS runs as a "guest" operating system in a private virtual machine created by the VM control program. The control program plus CMS together create a multi-user time-sharing operating system.

An instance of CMS ceases to exist when you load Linux or another system from within it. In that respect, CMS can be viewed as boot loader like lilo or grub, even though CMS also functions as complete operating system in itself, and in many instances it is not used to load another operating system. When you logon to a VM system, you are immediately dropped into the control program, CP.


To start CMS, you issue the commands:


This instructs CP to IPL (or "boot") CMS. A 'Ready;' prompt means that you are now in CMS. The CP "BEGIN" command shouild have the same effect. If you are in doubt as to what environemnt you are in, hit the enter key twice and either "CP" or "CMS" should appear on your terminal.

Once inside of CMS, you can use the "HELP" command to get a listing of CP and CMS commands available to you. Place your cursor on the line where the desired menu item is located and hit enter and you will be taken to that help screen. You can exit by hitting program function key PF3.

Fle System

What filenames are to Linux, fileids are to CMS. Fileids have three parts to them. The filename, the filetype, and the Format. To list all files on your system you will need to issue the following command:


Note that a single asterisk will not get you all files on youir system. You need one asterisk for use as a wildcard for each of the three components of the fileid.

External links