The Machine Language Monitor
Most PET/CBM computers have a simple MLM (machine language monitor) built in. It may be extended with extra commands. The Commodore PLUS/4 contains a very powerful MLM. The VIC-20 and Commodore 64 do not have a built-in MLM, but one can be added. Such a monitor may be either loaded into RAM or plugged in as a cartridge. Monitors may be purchased or obtained from user clubs.
Most machine language monitors work in a similar way, and have about the same commands. To proceed, you'll need an MLM in your computer. Use the built-in one, plug it in, load it in, or load and run ... whatever the instructions tell you. On a PET/CBM machine, typing the command SYS A will usually switch you to the built-in monitor. After an MLM has been added to a VIC or Commodore 64. the command SYS fl will usually get you there. On the Commodore PLUS/4, the BASIC command MONITOR will bring the monitor into play.
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