The use of a writable control memory in a multiprogramming environment
MICRO 5 Conference record of the 5th annual workshop on Microprogramming
Main memory for user microprogram residence - an analysis
MICRO 6 Conference record of the 6th annual workshop on Microprogramming
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The concept of allowing the computer user to modify the virtual machine being emulated by a microprogram controlled computer is not new. Schemes for implementing this typically include the definition of a standard virtual machine (the base machine) in read-only control storage, and the provision of some writable memory to contain user-written microroutines for the duration of the user job. Alternation of a computer instruction set by the temporary addition of microroutines to the system repertoire for emulation of new instructions is known as dynamic user microprogramming.