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System for Redundant Micro Instructions

IP.com Disclosure Number: IPCOM000075542D
Original Publication Date: 1971-Oct-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 18K

Publishing Venue

IBM

Related People

Gallagher, JG: AUTHOR

Abstract

This system eliminates the requirement of separate storage capacity for redundant sets or strings of microprogram instructions utilized by a compatible data responsive machine, not shown.

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System for Redundant Micro Instructions

This system eliminates the requirement of separate storage capacity for redundant sets or strings of microprogram instructions utilized by a compatible data responsive machine, not shown.

The present system employs a microprogram operation code with the illustrated form. The fields of the code represent the following: OP- This portion or field defines an "execute string" instruction to the machine. POINTER- This field defines the particular set or string of microprogram instructions to be executed. COUNT- This field defines the number of microprogram instructions to be executed in the particular set of microprogram instructions selected by the POINTER field.

The machine is suitably modified to take into account the address location of the next microprogram instruction, i.e. the one following the execution of the selected set or string of microprogram instructions. In addition, a suitable counter and sensing means is provided which is loaded with the COUNTER field information of the particular microprogram operation code.

In operation, the system, after execution of the selected microprogram instruction string, returns to the aforementioned "next" microprogram instruction automatically when the counter value goes to zero. Furthermore, this is done without any loss in machine speed or any special micro-word operation code to do the "return" function. The system thus provides an economical way to share as little as two consecu...