| 摘要 |
An arrangement for a personal computer system including an original microprocessor (P2) and an upgrade processor (P1) comprises a bus controller (4) which provides first and second operational modes, the first operational mode being a single processor mode in which only the upgrade processor (P1), which comprises a master upgrade processor, is in operation so that conventional types of adapted software are usable, and the second operational mode being a multiprocessor mode for specially adapted software in which the upgrade processor (P1) acts as a master and the original microprocessor (P2) and any other upgrade processors act as slaves. The bus controller (4) is arranged to provide the single processor mode at start or reset of the personal computer system. Transfer to the multiprocessor mode is controlled by the master upgrade processor (P1) in answer to a program instruction. <IMAGE> |
