Boots – shoes – and leggings
Patent
1987-10-28
1990-08-28
Shaw, Gareth D.
Boots, shoes, and leggings
364900, 364228, 364243, 3642304, 3649314, 364964, G06F 1516
Patent
active
049530780
ABSTRACT:
In a microcoded central processing unit, apparatus and method are disclosed for permitting execution of a plurality of software programs, the secondary program being executed during no-op instructions for the primary program. The apparatus of the central processing unit is divided into two subunits capable of independent instruction execution for at least one timing cycle and referred to as master and slave portions. The memory unit storing the microcoded instruction word has two subunits, a subunit associated with the master portion and a subunit associated with the slave portion. Associated with each memory subunit is a microcode instruction word register that controls the operation of the associated portion of the central processing unit apparatus. Associated with each program is a microcode program counter that contains the address of the next instruction word in the program being executed. The master portion always executes from the primary program; while the slave portion executes either program under the control of a bit in the microcode instruction word associated with the master portion. This bit identifies that the next instruction in the primary instruction sequence is a no-op instruction with regard to the slave portion and indicates that the slave portion data processing apparatus is available for execution of a secondary program instruction during the primary program no-op instruction.
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Digital Equipment Corporation
Glenn Michael A.
Holloway William W.
Ray Gopal C.
Shaw Gareth D.
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